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Electrical and Electronics Engineering publications abstract of: 07-2012 sorted by title, page: 0
» 0.8V PLL-based automatic frequency tuning system for current-mode filters
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Autors:
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 1/f Noise Sources in Dual-Gated Indium Arsenide Nanowire Transistors
Abstract:
1/f noise is studied in dual-gated InAs nanowire transistors consisting of an omega top gate with high- atomic layer deposited dielectric and silicon dioxide to substrate back gate. Noise spectra at varying gate bias combinations are compared from devices with differing top-gate lengths to separate the noise contributions of the top-gated channel from the ungated access portion, including the metal–nanowire contacts. For a given device geometry, it is possible to bias the device into four different regimes where the resistance and the noise amplitude can each be independently dominated by either the channel or the access/contact regions. When the device is fully in the on state, the access/contact regions dominate both resistance and noise. When the device is operating near or below threshold, the channel dominates resistance and noise. For the lowest amount of overall 1/f noise, most of the nanowire should be covered by the top gate, minimizing the access region length.
Autors: Delker, C. J.;Kim, S.;Borg, M.;Wernersson, L.-E.;Janes, D. B.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Jul 2012, volume: 59, issue:7, pages: 1980 - 1987
Publisher: IEEE
 
» 10 dB small-signal graphene FET amplifier
Abstract:
Reported is the realisation of a graphene FET microwave amplifier operating at 1 GHz, exhibiting a small-signal power gain of 10 dB and a noise figure of 6.4 dB. The amplifier utilises a matching inductor on the gate yielding a return loss of 20 dB. The design is optimised for maximum gain and the optimum noise figure is extracted by noise modelling and predicted to be close to 1 dB for the intrinsic graphene FET at this frequency. The presented results complement existing graphene FET applications and are promising for future graphene microwave circuits.
Autors: Andersson, M.A.;Habibpour, O.;Vukusic, J.;Stake, J.;
Appeared in: Electronics Letters
Publication date: Jul 2012, volume: 48, issue:14, pages: 861 - 863
Publisher: IEEE
 
» 10 ps resolution, 160 ns full scale range and less than 1.5% differential non-linearity time-to-digital converter module for high performance timing measurements
Abstract:
We present a compact high performance time-to-digital converter (TDC) module that provides 10 ps timing resolution, 160 ns dynamic range and a differential non-linearity better than 1.5% LSBrms. The TDC can be operated either as a general-purpose time-interval measurement device, when receiving external START and STOP pulses, or in photon-timing mode, when employing the on-chip SPAD (single photon avalanche diode) detector for detecting photons and time-tagging them. The instrument precision is 15 psrms (i.e., 36 psFWHM) and in photon timing mode it is still better than 70 psFWHM. The USB link to the remote PC allows the easy setting of measurement parameters, the fast download of acquired data, and their visualization and storing via an user-friendly software interface. The module proves to be the best candidate for a wide variety of applications such as: fluorescence lifetime imaging, time-of-flight ranging measurements, time-resolved positron emission tomography, single-molecule spectroscopy, fluorescence correlation spectroscopy, diffuse optical tomography, optical time-domain reflectometry, quantum optics, etc.
Autors: Markovic, B.;Tamborini, D.;Villa, F.;Tisa, S.;Tosi, A.;Zappa, F.;
Appeared in: Review of Scientific Instruments
Publication date: Jul 2012, volume: 83, issue:7, pages: 074703 - 074703-10
Publisher: IEEE
 
» 15.1 mW 60 ghz up-conversion mixer with 4.5 dB gain and 57.5 dB LO-RF isolation
Abstract:
A low-power and high conversion gain (CG) 60 GHz up-conversion mixer using standard 90 nm CMOS technology is demonstrated. The up-conversion mixer comprises a novel double-balanced Gilbert cell with negative resistance compensation for CG enhancement, a Marchand balun for converting the single LO input signal to a differential signal, and another Marchand balun for converting the differential RF output signal to a single signal. The up-conversion mixer consumes 15.1 mW and achieves IF-port input reflection coefficient (Γin) of -36.7 dB at 0.1 GHz, LO-port (Γin) of -13.1 dB at 59.9 GHz, and RF-port (Γin) of -28.8 dB at 60 GHz. At IF of 0.1 GHz and RF of 60 GHz, the up-conversion mixer achieves CG of 4.5 dB and LO-RF isolation of 57.5 dB, one of the best CG and isolation results ever reported for a 60 GHz CMOS up-conversion mixer.
Autors: Tsai, T.M.;Lin, Y.-S.;
Appeared in: Electronics Letters
Publication date: Jul 2012, volume: 48, issue:14, pages: 844 - 845
Publisher: IEEE
 
» 19-Gb/s adaptively modulated optical OFDM transmission by separated I/Q baseband delivery using 1GHz RSOAs
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Highlights

Appeared in: Optical Fiber Technology
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 2-ω and 3-ω temperature measurement of a heated microcantilever
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This article describes temperature measurement of a heated atomic force microscope cantilever using the 2ω and 3ω harmonics of the cantilever temperature signal. When the cantilever is periodically heated, large temperature oscillations lead to large changes in the cantilever electrical resistance and also lead to nonconstant temperature coefficient of resistance. We model the cantilever heating to account for these sources of nonlinearity, and compare models with experiment. When the heating voltage amplitude is 17.9 V over the driving frequency range 10 Hz–34 kHz, the cantilever temperature oscillation is between 5 °C and 200 °C. Over this range, the corrected 2ω method predicts cantilever temperature to within 16% and the corrected 3ω method predicts the cantilever temperature within 3%. We show a general method for predicting the periodic cantilever temperature, sources of errors, and corrections for these errors.
Autors: Lee, Byeonghee;King, William P.;
Appeared in: Review of Scientific Instruments
Publication date: Jul 2012, volume: 83, issue:7, pages: 074902 - 074902-7
Publisher: IEEE
 
» 2-D sizing of sodium oxalate crystals by automated optical image analysis
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Appeared in: Advanced Powder Technology
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 2011 EuroSimE international conference on thermal, mechanical and multi-physics simulation and experiments in micro-electronics and micro-systems
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Autors:
Appeared in: Microelectronics Reliability
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 2011-12 activities of the Hyderabad chapter [Global Communications Newsletter]
Abstract:
The communications and Signal processing societies Joint Chapter of IEEE Hyderabad section has taken initiative for IEEE Comm. Society Distinguished Lecture Tours (DLTs) of Prof. Marco Chiani and Prof. Koichi Asatani, and IEEE SPS DLT of Prof. Sheila Hemami in 2011 and 20112 in India.The chapter has organized the DLs of Prof. Hemami, Prof. Chiani and Prof. Asatani in Hyderabad.
Autors: Korrai, D.R.;
Appeared in: IEEE Communications Magazine
Publication date: Jul 2012, volume: 50, issue:7, pages: 1 - 4
Publisher: IEEE
 
» 2D ordered arrays of nanopatterns fabricated by using colloidal crystals as templates
Abstract:
A facile approach to fabricate two-dimensional (2D) ordered arrays of nanostructures is described in this paper. The approach uses spin-coating liquid materials onto a monolayer or multilayer colloidal crystal template to form a uniform film containing the template. After solidifying, the film is partially etched to expose the template which is then removed by selective etching. The fabrication procedure can produce large-area, size-tunable, periodic nanostructures with excellent structural uniformity. Large-area silica nanostructures with P6 mm symmetry have been formed by employing a dry etching technique. Experimental and simulating results also show that unique 2D nanostructures, with the feature size being much smaller than the diameter of the spherical particles used, can be obtained through three-dimensional silica nanopatterns, acted as a mask, and formed by a bilayer or trilayer colloidal crystal template.
Autors: Wang, Benzhong;Han, Mingyong;Jin Chua, Soo;
Appeared in: Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures
Publication date: Jul 2012, volume: 30, issue:4, pages: 041802 - 041802-7
Publisher: IEEE
 
» 3 MV hypervelocity dust accelerator at the Colorado Center for Lunar Dust and Atmospheric Studies
Abstract:
A hypervelocity dust accelerator for studying micrometeorite impacts has been constructed at the Colorado Center for Lunar Dust and Atmospheric Studies (CCLDAS) at the University of Colorado. Based on the Max-Planck-Institüt für Kernphysik (MPI-K) accelerator, this accelerator is capable of emitting single particles of a specific mass and velocity selected by the user. The accelerator consists of a 3 MV Pelletron generator with a dust source, four image charge pickup detectors, and two interchangeable target chambers: a large high-vacuum test bed and an ultra-high vacuum impact study chamber. The large test bed is a 1.2 m diameter, 1.5 m long cylindrical vacuum chamber capable of pressures as low as 10-7 torr while the ultra-high vacuum chamber is a 0.75 m diameter, 1.1 m long chamber capable of pressures as low as 10-10 torr. Using iron dust of up to 2 microns in diameter, final velocities have been measured up to 52 km/s. The spread of the dust particles and the effect of electrostatic focusing have been measured using a long exposure CCD and a quartz target. Furthermore, a new technique of particle selection is being developed using real time digital filtering techniques. Signals are digitized and then cross-correlated with a shaped filter, resulting in a suppressed noise floor. Improvements over the MPI-K design, which include a higher operating voltage and digital filtering for detection, increase the available parameter space of dust emitted by the accelerator. The CCLDAS dust facility is a user facility open to the scientific community to assist with instrument calibrations and experiments.
Autors: Shu, Anthony;Collette, Andrew;Drake, Keith;Grun, Eberhard;Horanyi, Mihaly;Kempf, Sascha;Mocker, Anna;Munsat, Tobin;Northway, Paige;Srama, Ralf;Sternovsky, Zoltan;Thomas, Evan;
Appeared in: Review of Scientific Instruments
Publication date: Jul 2012, volume: 83, issue:7, pages: 075108 - 075108-8
Publisher: IEEE
 
» 3,4-Methylenedioxymethylamphetamine detection using a microcantilever-based biosensor
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Highlights

Appeared in: Sensors and Actuators A: Physical
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 3-D Quantitative Vascular Shape Analysis for Arterial Bifurcations via Dynamic Tube Fitting
Abstract:
Reliable and reproducible estimation of vessel centerlines and reference surfaces is an important step for the assessment of luminal lesions. Conventional methods are commonly developed for quantitative analysis of the “straight” vessel segments and have limitations in defining the precise location of the centerline and the reference lumen surface for both the main vessel and the side branches in the vicinity of bifurcations. To address this, we propose the estimation of the centerline and the reference surface through the registration of an elliptical cross-sectional tube to the desired constituent vessel in each major bifurcation of the arterial tree. The proposed method works directly on the mesh domain, thus alleviating the need for image upsampling, usually required in conventional volume domain approaches. We demonstrate the efficiency and accuracy of the method on both synthetic images and coronary CT angiograms. Experimental results show that the new method is capable of estimating vessel centerlines and reference surfaces with a high degree of agreement to those obtained through manual delineation. The centerline errors are reduced by an average of 62.3% in the regions of the bifurcations, when compared to the results of the initial solution obtained through the use of mesh contraction method.
Autors: Wang, Y.;Liatsis, P.;
Appeared in: IEEE Transactions on Biomedical Engineering
Publication date: Jul 2012, volume: 59, issue:7, pages: 1850 - 1860
Publisher: IEEE
 
» 3-D Soil Stratification Methodology for Geoelectrical Prospection
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The purpose of this paper is to present an innovative methodology for 3-D soil stratification based on geoelectrical prospection. This methodology is useful in optimal substation grounding system designs by providing an accurate 3-D soil resistivity model. In the present methodology, the area being studied is subdivided into squared subareas and a recently developed geoelectrical prospection method based on the Wenner's method and on a genetic algorithm is applied to each subarea's edge. For each subarea, the soil stratification result consists of the number of layers and of its electrical resistivities and thicknesses. A global 3-D soil stratification solution is then obtained from these data. Results obtained with this new method are presented and discussed.
Autors: Calixto, W. P.;Coimbra, A. P.;Alvarenga, B.;Molin, J. P.;Cardoso, A.;Neto, L. M.;
Appeared in: IEEE Transactions on Power Delivery
Publication date: Jul 2012, volume: 27, issue:3, pages: 1636 - 1643
Publisher: IEEE
 
» 30-kV spin-polarized transmission electron microscope with GaAs–GaAsP strained superlattice photocathode
Abstract:
A spin-polarized electron beam has been used as the probe beam in a transmission electron microscope by using a photocathode electron gun with a photocathode made of a GaAs–GaAsP strained superlattice semiconductor with a negative electron affinity (NEA) surface. This system had a spatial resolution of the order of 1 nm for at 30 keV and it can generate an electron beam with an energy width of 0.24 eV without employing monochromators. This narrow width suggests that a NEA photocathode can realize a high energy resolution in electron energy-loss spectroscopy and a longitudinal coherence of 3 × 10-7 m.
Autors: Kuwahara, M.;Kusunoki, S.;Jin, X. G.;Nakanishi, T.;Takeda, Y.;Saitoh, K.;Ujihara, T.;Asano, H.;Tanaka, N.;
Appeared in: Applied Physics Letters
Publication date: Jul 2012, volume: 101, issue:3, pages: 033102 - 033102-4
Publisher: IEEE
 
» 3000-V 4.3- InAlN/GaN MOSHEMTs With AlGaN Back Barrier
Abstract:
This letter reports the fabrication of InAlN/GaN high-electron mobility transistors (HEMTs) with a three-terminal off-state breakdown voltage (BV) of 3000 V and a low specific on-resistance of 4.25 . To reduce the drain-to-source leakage current in these devices, an AlGaN back barrier has been used. The gate leakage current in these devices is in the range owing to the use of a gate dielectric. This current level is more than six orders of magnitude lower than in Schottky-barrier HEMTs. The combination of an AlGaN back barrier, the high charge sheet density of InAlN/GaN HEMTs, and the low leakage due to the gate-dielectric layer allows for a figure-of-merit of .
Autors: Lee, H.-S.;Piedra, D.;Sun, M.;Gao, X.;Guo, S.;Palacios, T.;
Appeared in: IEEE Electron Device Letters
Publication date: Jul 2012, volume: 33, issue:7, pages: 982 - 984
Publisher: IEEE
 
» 3D force sensor for biomechanical applications
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Highlights

Appeared in: Sensors and Actuators A: Physical
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 3D IC floorplanning: Automating optimization settings and exploring new thermal-aware management techniques
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Autors:
Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 3D micro patterning on a concave substrate for creating the replica of a cylindrical PDMS stamp
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Appeared in: Microelectronic Engineering
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 3D model based tracking for omnidirectional vision: A new spherical approach
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Appeared in: Robotics and Autonomous Systems
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 3D thermal-aware floorplanner using a MILP approximation
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Appeared in: Microprocessors and Microsystems
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» 60 GHz Plated Through Hole Printed Magneto-Electric Dipole Antenna
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A wideband unidirectional antenna, which is composed of a planar electric dipole and a magnetic dipole formed by a vertically-oriented shorted patch antenna, is presented for millimeter wave applications. The antenna is realized by a plated through hole printed technique with the use of a microwave substrate and is excited by a T-shaped coupled strip feed. An impedance bandwidth of 33% from 50 to 70 GHz is achieved. Stable radiation patterns with low cross polarizations and a stable antenna gain of are achieved across the entire operating bandwidth. This single antenna element yields advantages of wideband, good directional radiation pattern and low fabrication cost.
Autors: Ng, K. B.;Wong, H.;So, K. K.;Chan, C. H.;Luk, K. M.;
Appeared in: IEEE Transactions on Antennas and Propagation
Publication date: Jul 2012, volume: 60, issue:7, pages: 3129 - 3136
Publisher: IEEE
 
» RTD–MOSFET Millimeter-Wave Wavelet Generator
Abstract:
We report on the fabrication of a self-aligned regrown metal–oxide–semiconductor field-effect transistor (MOSFET) and a resonant tunneling diode (RTD). The performance of these devices is demonstrated by integrating them in parallel with an inductive coplanar waveguide stub to form a highly energy-efficient 70-GHz wavelet generator. The fast switching and low on-resistance of the MOSFET make it possible to kick-start and rapidly quench this RTD-driven oscillator circuit, which produces 41-ps-short wavelets at 15 Gpulses/s, a peak output power of 7 dBm, and an energy consumption of 1.9 pJ/pulse.
Autors: Egard, M.;Arlelid, M.;Ohlsson, L.;Borg, B. M.;Lind, E.;Wernersson, L.-E.;
Appeared in: IEEE Electron Device Letters
Publication date: Jul 2012, volume: 33, issue:7, pages: 970 - 972
Publisher: IEEE
 
» -Based RRAM Devices With Varying Contact Sizes and Their Electrical Behavior
Abstract:
In this letter, -based RRAM with varying device sizes is discussed with an analysis of the device-size dependence on reset current . Device sizes down to 60 nm were achieved by using different thicknesses of nitride spacer after 200-nm contact hole is formed. Platinum (Pt) bottom electrode and titanium nitride (TiN) top electrode were used with dielectric as the resistance switching layer. Uniform bipolar switching characteristics with a very low of about 100 are achieved in 60-nm contact size devices. Self-compliance effect is also observed in the scaled devices.
Autors: Sriraman, V.;Li, X.;Singh, N.;Lee, S.;
Appeared in: IEEE Electron Device Letters
Publication date: Jul 2012, volume: 33, issue:7, pages: 1060 - 1062
Publisher: IEEE
 
» A 0.47–1.6 mW 5-bit 0.5–1 GS/s Time-Interleaved SAR ADC for Low-Power UWB Radios
Abstract:
This paper presents a 16-channel time-interleaved 5-bit asynchronous SAR ADC for UWB radios. It proposes 400 aF unit capacitors, offset calibration, a self-resetting comparator and a distributed clock divider to optimize the performance. The prototype in 90 nm CMOS occupies only 0.11 mm including decoupling capacitors. Two relevant modes for UWB are supported: 0.5 GS/s at 0.75 V supply, and 1 GS/s at 1 V supply with 0.47 mW and 1.6 mW power consumption respectively. With an ENOB of 4.7 and 4.8 bits, this leads to energy efficiencies of 36 and 57 fJ/conversion-step. Compared to prior-art, state-of-the-art efficiency is achieved without relying on complex calibration schemes.
Autors: Harpe, P. J. A.;Busze, B.;Philips, K.;de Groot, H.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1594 - 1602
Publisher: IEEE
 
» A 1.2–6 Gb/s, 4.2 pJ/Bit Clock & Data Recovery Circuit With High Jitter Tolerance in 0.14 m CMOS
Abstract:
In this paper, a highly parallelized Clock & Data Recovery (CDR) circuit with phase feedback at the bit rate is presented. This parallel CDR features demultiplexing directly at the input, which reduces circuit speed requirements and enables extensive use of standard CMOS logic which only draws dynamic power, resulting in excellent power efficiency over a wide range of speeds: an almost constant 4.2 pJ/bit between 2.4 and 6 Gb/s. Parallel CDRs traditionally have limited loop bandwidth and jitter tolerance due to latency in the phase-feedback loop. Our architecture solves this problem by applying feedback at the bit rate, resulting in jitter tolerance beyond 4.3 Unit Interval at 1 MHz.
Autors: van der Wel, A. P.;den Besten, G. W.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1768 - 1775
Publisher: IEEE
 
» A 1.95 GHz Sub-1 dB NF, +40 dBm OIP3 WCDMA LNA Module
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A silicon integrated LNA for WCDMA cellular infrastructure applications, e.g., base stations will be demonstrated. The LNA is designed for WCDMA band II, i.e., 1.92–1.98 GHz, and reaches a 0.9 dB NF at 27 C and 1.2 dB at 65 C. A 0.1 dB NF improvement is obtained when the first gain stage is implemented using a cascode topology rather than a two-stage topology. The output IP3 is 40 dBm ( 38 dBm) at 27 and 37 dBm ( 36 dBm) at 65 for the two-stage (cascode) topology. Both options have an input return loss better than 20 dB and output return loss better than 20 dB. A bypass mode and variable attenuation are provided to cope with large input signals. Implemented in a SiGe:C BiCMOS technology, the two-die MMIC is packaged on a single laminate. The total solution consumes just below 200 mA from a 5 V supply.
Autors: Bergervoet, J.;Leenaerts, D. M. W.;de Jong, G. W.;van der Heijden, E.;Lobeek, J.-W.;Simin, A.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1672 - 1680
Publisher: IEEE
 
» A 12 b 5-to-50 MS/s 0.5-to-1 V Voltage Scalable Zero-Crossing Based Pipelined ADC
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A voltage scalable zero-crossing based (ZCB) pipelined ADC built in 65 nm CMOS is described. The highly digital implementation characteristic of the ZCB circuit technique enables energy efficient operation and supply voltage scaling. Several new techniques including the unidirectional coarse-fine charge transfer scheme, programmable ramp rates, and flash resistor ladder scaling, are developed to allow efficient operation at different supply voltages as well as to extend the supply voltage range down to 0.5 V. Two versions, the first fabricated in 65 nm GP (general purpose) technology, and the second in 65 nm LP (low power) technology from an identical design file show similar performance characteristics except for the power supply voltage ranges, demonstrating the robustness of the design. At 1.0 V (GP)/1.2 V (LP) nominal supply and 50 MS/s, the ADC achieves 67.7 dB (GP)/68.1 dB (LP) SNDR after calibration while dissipating 4.07 mW (GP)/4.93 mW (LP), resulting in an FOM of 41.0 fJ/step (GP)/47.5 fJ/step (LP). The supply voltage scalability is demonstrated down to 0.5 V (GP)/0.8 V (LP) and improves the FOM to 28.0 fJ/step (GP)/37.8 fJ/step (LP), while maintaining higher than 66 dB SNDR.
Autors: Lee, S.;Chandrakasan, A. P.;Lee, H.-S.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1603 - 1614
Publisher: IEEE
 
» A 1V, 69-73GHz CMOS power amplifier based on improved Wilkinson power combiner
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Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A 20Gb/s triple-mode (PAM-2, PAM-4, and duobinary) transmitter
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Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A 24W Ku band GaN based power amplifier with 9.1dB linear gain
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Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A 3-D Global Earth-Ionosphere FDTD Model Including an Anisotropic Magnetized Plasma Ionosphere
Abstract:
A 3-D global Earth-ionosphere finite-difference time-domain (FDTD) model is introduced that includes for the first time an anisotropic magnetized cold plasma ionosphere. All previous global FDTD Earth-ionosphere models to date have employed an isotropic conductivity profile. To generate the new model, a previously validated and published 3-D Cartesian magnetized cold plasma algorithm is adapted to the global latitude-longitude FDTD mesh that involves trapezoidal cells, merging of cells in the Polar regions, and triangular cells at the Poles. The global geomagnetic field, ionospheric particle densities and collision frequencies, as well as the Earth's topographic and bathymetric data are all mapped onto the global space grid. After a local high-resolution validation that demonstrates correct calculations of electromagnetic propagation in magnetized plasma, another numerical study is performed to validate the model on a global scale. This new model opens doors to a wide variety of advanced modeling for higher frequency and higher altitude electromagnetic phenomena and represents a paradigm shift from the commonly used ray-tracing codes. It also provides the opportunity to couple FDTD Earth-ionosphere models to other geophysical models, such as the Naval Research Lab's SAMI3, to yield a multiphysics simulator.
Autors: Yu, Y.;Niu, J.;Simpson, J. J.;
Appeared in: IEEE Transactions on Antennas and Propagation
Publication date: Jul 2012, volume: 60, issue:7, pages: 3246 - 3256
Publisher: IEEE
 
» A 3-DOF parallel manufacturing module and its kinematic optimization
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Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A 3.2ppm/C curvature-compensated bandgap reference with wide supply voltage range
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Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A 3.4 W Digital-In Class-D Audio Amplifier in 0.14 m CMOS
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In this paper a class-D audio amplifier for mobile applications is presented realized in a 0.14 CMOS technology tailored for mobile applications. The amplifier has a simple PDM-based digital interface for audio and control that requires only two pins and enables assembly in 9-bump WL-CSP. The complete audio path is discussed that consists of a Parser, Digital PWM controller, 1-bit DA-converters, analog feedback loop and the Class-D power stage. A reconfigurable gate driver is used that reduces quiescent current consumption and radiated emission.
Autors: Dooper, L.;Berkhout, M.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1524 - 1534
Publisher: IEEE
 
» A 3.6 mW, 90 nm CMOS Gated-Vernier Time-to-Digital Converter With an Equivalent Resolution of 3.2 ps
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Two gated ring oscillators (GROs) act as the delay lines in an improved Vernier time-to-digital converter (TDC), where the already small quantization noise of the standard Vernier TDC is further first-order shaped by the GRO operation. The TDC has been implemented in a 90 nm CMOS process and consumes 3 mA from 1.2 V when operating at 25 MHz. The native Vernier resolution of the TDC is 5.8 ps, while the total noise integrated over a bandwidth of 800 kHz yields an equivalent TDC resolution of 3.2 ps.
Autors: Lu, P.;Liscidini, A.;Andreani, P.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1626 - 1635
Publisher: IEEE
 
» A 53-nW 9.1-ENOB 1-kS/s SAR ADC in 0.13- m CMOS for Medical Implant Devices
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This paper describes an ultra-low power SAR ADC for medical implant devices. To achieve the nano-watt range power consumption, an ultra-low power design strategy has been utilized, imposing maximum simplicity on the ADC architecture, low transistor count and matched capacitive DAC with a switching scheme which results in full-range sampling without switch bootstrapping and extra reset voltage. Furthermore, a dual-supply voltage scheme allows the SAR logic to operate at 0.4 V, reducing the overall power consumption of the ADC by 15% without any loss in performance. The ADC was fabricated in 0.13- m CMOS. In dual-supply mode (1.0 V for analog and 0.4 V for digital), the ADC consumes 53 nW at a sampling rate of 1 kS/s and achieves the ENOB of 9.1 bits. The leakage power constitutes 25% of the 53-nW total power.
Autors: Zhang, D.;Bhide, A.;Alvandpour, A.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1585 - 1593
Publisher: IEEE
 
» A 60 GHz Cascode Variable-Gain Low-Noise Amplifier With Phase Compensation in a 0.13 CMOS Technology
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A 60 GHz variable-gain low-noise amplifier (LNA) with varactor-based phase compensation is developed using a 0.13 CMOS process. Based on the analysis of the phase variation during the gain control in the cascode-FET unit cell, a simple varactor-based phase compensation method is proposed. A linear bias control scheme for the gate of the common-source FET and the cathode of nMOS varactor at the gate of common-gate FET results in the phase compensation between the two FET's in the cascode cell. The gain control range is also expanded with the proposed approach. The fabricated variable-gain LNA (VG-LNA) shows a small phase variation of 5 over a gain control range of 13 dB.
Autors: Kim, Y.;Kwon, Y.;
Appeared in: IEEE Microwave and Wireless Components Letters
Publication date: Jul 2012, volume: 22, issue:7, pages: 372 - 374
Publisher: IEEE
 
» A 65 nm CMOS Digital Phase Imager for Time-Resolved Fluorescence Imaging
Abstract:
This paper presents a CMOS image sensor with direct digital phase output for time-resolved fluorescence imaging applications. A row-level zero-crossing detection is implemented to extract the phase-shift between the intensity modulated excitation signal and the emitted fluorescence, generating a time delay signal proportional to the fluorescence lifetime of the target analyte. A time-interpolated Time-to-Digital Converter (TDC) is subsequently used to quantize the time delay into a digital representation of the phase-shift for post-signal processing and image reconstruction. For proof-of-concept, a prototype chip consisting of a 32x32 P+/N-Well/P-Substrate photodiode array, row-level phase readout circuits, and a global TDC is implemented in a low-power 65 nm CMOS technology. The TDC features a temporal resolution of 110 ps over a 414 s range, which corresponds to a dynamic range of 132 dB. Extensive characterization results demonstrate a phase readout sensitivity of better than 0.01 degrees at a 1.2 kHz modulation frequency and 0.1 degrees at up to 1 MHz. The complete imager chip is evaluated through a sequence of phase image reconstruction experiments, and the results are presented.
Autors: Guo, J.;Sonkusale, S.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1731 - 1742
Publisher: IEEE
 
» A 65 nm, 850 MHz, 256 kbit, 4.3 pJ/access, Ultra Low Leakage Power Memory Using Dynamic Cell Stability and a Dual Swing Data Link
Abstract:
This paper presents the design of a high-speed ultra low power SRAM memory. Divided bit lines improve dynamic cell stability while at the same time decreasing active energy consumption. To limit unnecessary activity, word lines are divided on a word-by-word basis. Local write sense amplifiers make it possible to use low swing signaling on the global bit lines. To control this architecture, a distributed decoder is used. The use of dual swing data links on the global bit lines limits the impact of local write sense amplifier offset on the overall energy consumption. Using high threshold transistors in the memory cells reduces static power consumption and improves the cell's read stability. A partly dynamic decoder structure increases memory speed at a very low energy cost. The timing of this memory is made configurable to be able to cope with PVT variations without increasing design margins.
Autors: Rooseleer, B.;Cosemans, S.;Dehaene, W.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1784 - 1796
Publisher: IEEE
 
» A 65-nm, 1-A Buck Converter With Multi-Function SAR-ADC-Based CCM/PSK Digital Control Loop
Abstract:
This paper proposes a 1-A, 6.4-MHz switching frequency DC-DC converter with embedded digital controller, implemented in 65-nm CMOS technology. The proposed DC-DC converter, exploiting a customized, multi-function SAR ADC and a non-linear PID controller, can switch automatically between continuous-conduction mode and pulse-skipping mode, thus maintaining a fairly large efficiency also for light loads. Moreover, a feedforward path in the digital control loop, implemented using the SAR ADC for converting also the battery voltage, significantly improves the line transient performance. The DC-DC converter, which occupies an area of 0.038 , consumes 115.5 , and requires an external inductance as low as 470 nH, is particularly suited for portable applications.
Autors: Cliquennois, S.;Donida, A.;Malcovati, P.;Baschirotto, A.;Nagari, A.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1546 - 1556
Publisher: IEEE
 
» A 7-Bit 18th Order 9.6 GS/s FIR Up-Sampling Filter for High Data Rate 60-GHz Wireless Transmitters
Abstract:
This paper presents the design and measurement of a 4 oversampled 18th order digital low-pass FIR filter. It is a key building block in the proposed digitally enhanced transmitter architecture for 60 GHz wireless high-data rate links. Spectrum mask requirements are fully satisfied for OFDM modulated signals without requiring additional analog filtering. Pipelined CPL adders and TSPC flip-flops are used to enable a very high operation frequency. The core area is 0.1 mm in a standard GP 65 nm CMOS process. Measured power consumption is 400 mW at 9.6 GS/s with a 1.4 V power supply voltage.
Autors: Muller, J.;Stefanelli, B.;Frappe, A.;Ye, L.;Cathelin, A.;Niknejad, A.;Kaiser, A.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Jul 2012, volume: 47, issue:7, pages: 1743 - 1756
Publisher: IEEE
 
» A Bayesian approach to sparse dynamic network identification
Abstract:


Autors:
Appeared in: Automatica
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A bivariate model for retinal image identification in lambs
Abstract:


Autors:

Highlights

Appeared in: Computers and Electronics in Agriculture
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Block-Based Pass-Parallel SPIHT Algorithm
Abstract:
Set-partitioning in hierarchical trees (SPIHT) is a widely used compression algorithm for wavelet-transformed images. One of its main drawbacks is a slow processing speed due to its dynamic processing order that depends on the image contents. To overcome this drawback, this paper presents a modified SPIHT algorithm called block-based pass-parallel SPIHT (BPS). BPS decomposes a wavelet-transformed image into 4 4 blocks and simultaneously encodes all the bits in a bit-plane of a 4 4 block. To exploit parallelism, BPS reorganizes the three passes of the original SPIHT algorithm and then BPS encodes/decodes the reorganized three passes in a parallel and pipelined manner. The precalculation of the stream length of each pass enables the parallel and pipelined execution of these three passes by not only an encoder but also a decoder. The modification of the processing order slightly degrades the compression efficiency. Experimental results show that the peak signal-to-noise ratio loss by BPS is between approximately 0.23 and 0.59 dB when compared to the original SPIHT algorithm. Both an encoder and a decoder are implemented in the hardware that can process 120 million samples per second at an operating clock frequency of 100 MHz. This processing speed allows a video of size of 1920 1080 in the 4:2:2 format to be processed at the rate of 30 frames/s. The gate count of the hardware is about 43.9 K.
Autors: Jin, Y.;Lee, H.-J.;
Appeared in: IEEE Transactions on Circuits and Systems for Video Technology
Publication date: Jul 2012, volume: 22, issue:7, pages: 1064 - 1075
Publisher: IEEE
 
» A Branched Reflector Technique to Reduce Crosstalk Between Slot-Crossing Signal Lines
Abstract:
A branched reflector technique is proposed to reduce the crosstalk between the signal lines crossing common slotted reference plane. An equivalent circuit model based on lossless transmission lines is applied to characterize the coupling mechanism. The design concept of this approach is well explained and its design method is also provided by utilizing the bounce diagram with multiple discontinuities. According to the experimental results, the reduction of the peak crosstalk is about 51% and it is close to the prediction from the estimated formula. The peak-to-peak crosstalk in our interested region can also be reduced by 68%. The proposed method provides a low-cost and effective solution to suppress the undesirable crosstalk between slot-crossing signal lines.
Autors: Chuang, H.-H.;Chou, C.-C.;Chang, Y.-J.;Wu, T.-L.;
Appeared in: IEEE Microwave and Wireless Components Letters
Publication date: Jul 2012, volume: 22, issue:7, pages: 342 - 344
Publisher: IEEE
 
» A broadband and compact asymmetrical backward coupled-line coupler with high coupling level
Abstract:


Autors:
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Broadband, Low Noise, Integrated 340 GHz Schottky Diode Receiver
Abstract:
A 340 GHz subharmonic Schottky diode mixer and a multioctave (3–16 GHz) custom low noise amplifier (LNA) have been integrated to form a compact receiver front-end module, exhibiting ultra low noise with an exceptional flat response and broadband instantaneous frequency coverage. At room temperature, a receiver noise temperature of 870 K is measured at an LO drive of 1.2 mW at 170 GHz. The total dc power consumption of the LNA is below 120 mW. Measurements are in good agreement with simulations taking the mixer and LNA mismatch interaction into account.
Autors: Sobis, P. J.;Wadefalk, N.;Emrich, A.;Stake, J.;
Appeared in: IEEE Microwave and Wireless Components Letters
Publication date: Jul 2012, volume: 22, issue:7, pages: 366 - 368
Publisher: IEEE
 
» A cascade face recognition system using hybrid feature extraction
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Highlights

Appeared in: Digital Signal Processing
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Channel Splitting Strategy for Reducing Handoff Delay in Internet-Based Wireless Mesh Networks
Abstract:
Seamless intergateway handoff support is an essential issue to ensure continuous communications in Internet-based wireless mesh networks (WMNs). Due to the existence of multihop wireless links, traditional handoff schemes designed for single-hop wireless access networks can hardly guarantee the low handoff latency requirement in multihop WMNs. Existing solutions on reducing the handoff delay in WMNs ignore one important factor for the long handoff delay: the channel access delay of handoff signaling packets over the multihop wireless mesh backbone network. In this paper, we address the seamless intergateway handoff issue in Internet-based WMNs from a different perspective and propose a channel splitting strategy to reduce the channel access delay of handoff signaling packets over multihop wireless links. The handoff procedures of two scenarios when a mobile node has one or two transceivers are designed, and two transmission strategies for scheduling the delivery of handoff signaling packets are proposed. Simulation results show that by using the proposed channel splitting strategy, the handoff delay requirement in WMNs can be guaranteed, regardless of the background data traffic, and the average channel utilization can also be improved.
Autors: Li, H.;Xie, J.;Wang, X.;
Appeared in: IEEE Transactions on Vehicular Technology
Publication date: Jul 2012, volume: 61, issue:6, pages: 2740 - 2752
Publisher: IEEE
 
» A class of low-pass FIR input shaping filters achieving exact residual vibration cancelation
Abstract:


Autors:
Appeared in: Automatica
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Class of Monte-Carlo-Based Statistical Algorithms for Efficient Detection of Repolarization Alternans
Abstract:
Cardiac repolarization alternans is an electrophysiologic condition identified by a beat-to-beat fluctuation in action potential waveform. It has been mechanistically linked to instances of T-wave alternans, a clinically defined ECG alternation in T-wave morphology, and associated with the onset of cardiac reentry and sudden cardiac death. Many alternans detection algorithms have been proposed in the past, but the majority have been designed specifically for use with T-wave alternans. Action potential duration (APD) signals obtained from experiments (especially those derived from optical mapping) possess unique characteristics, which requires the development and use of a more appropriate alternans detection method. In this paper, we present a new class of algorithms, based on the Monte Carlo method, for the detection and quantitative measurement of alternans. Specifically, we derive a set of algorithms (one an analytical and more efficient version of the other) and compare its performance with the standard spectral method and the generalized likelihood ratio test algorithm using synthetic APD sequences and optical mapping data obtained from an alternans control experiment. We demonstrate the benefits of the new algorithm in the presence of Gaussian and Laplacian noise and frame-shift errors. The proposed algorithms are well suited for experimental applications, and furthermore, have low complexity and are implementable using fixed-point arithmetic, enabling potential use with implantable cardiac devices.
Autors: Iravanian, S.;Kanu, U. B.;ChristiniTeX $^ dagger$, D. J.;
Appeared in: IEEE Transactions on Biomedical Engineering
Publication date: Jul 2012, volume: 59, issue:7, pages: 1882 - 1891
Publisher: IEEE
 
» A Class of Optimal Frequency Hopping Sequences with New Parameters
Abstract:
In this paper, we propose an interleaving construction of new sets of frequency hopping sequences from the known ones. By choosing suitable known optimal frequency hopping sequences and sets of frequency hopping sequences and then recursively applying the proposed construction, optimal frequency hopping sequences and sets of frequency hopping sequences with new parameters can be obtained.
Autors: Zeng, X.;Cai, H.;Tang, X.;Yang, Y.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Jul 2012, volume: 58, issue:7, pages: 4899 - 4907
Publisher: IEEE
 
» A Class-E Driven Inductive Power Delivery System Covering the Complete Upper Body
Abstract:


Autors:

Highlights

Appeared in: Sensors and Actuators A: Physical
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Classification Approach Using Support Vector Machines to Prevent Distance Relay Maloperation Under Power Swing and Voltage Instability
Abstract:
Distance relays, in the power transmission systems, are susceptible to the maloperation under certain system events, such as power swings and voltage instability, which drive the apparent impedance trajectories into the protection zones of the relay. Fast and reliable detection of the symmetrical faults, occurring during power swings, poses another challenge to operation of the distance relays. This paper introduces a new classification and protection scheme based on support vector machines (SVMs) for offering supervisory control to the operation of the conventional distance relays. The proposed scheme segregates the power system events into faults, power swings, and voltage instability. This paper also proposes a new index, called the relay ranking index, for identifying the relays most vulnerable to the maloperation due to power swings and voltage instability. The proposed SVM classifiers can work in unison with the conventional distance relay unit. The performance of the proposed scheme has been tested on a nine-bus WSCC system and 39-bus New England system.
Autors: Seethalekshmi, K.;Singh, S. N.;Srivastava, S. C.;
Appeared in: IEEE Transactions on Power Delivery
Publication date: Jul 2012, volume: 27, issue:3, pages: 1124 - 1133
Publisher: IEEE
 
» A Closed Loop Feedback System for Automatic Detection and Inhibition of Mechano-Nociceptive Neural Activity
Abstract:
Clinical studies have shown that spinal or cerebral neurostimulation can significantly relieve pain. Current neurostimulators work in an open loop; hence, their efficacy depends on the patient's or physician's comprehension of pain. We have proposed and developed a real-time automatic recognition program with signal processing functions to detect action potentials. By using a wireless neurorecording module, spinal neuronal responses to mechanical stimuli (brush, pressure, and pinch) applied to rats' hind paws were recorded. Nociceptive spinal responses were detected and suppressed by our automated module through delivering electrical stimulation to the periaqueductal gray (PAG). The interspike intervals (ISIs) of the fired action potentials were used to distinguish among the three different mechanical stimuli. Our system was able to detect the neuronal activity intensities and deliver trigger signals to the neurostimulator according to a pre-set threshold in a closed-loop feedback configuration, thereby suppressing excessive activity in spinal cord dorsal horn neurons.
Autors: Farajidavar, A.;Hagains, C. E.;Peng, Y. B.;Chiao, J.-C.;
Appeared in: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Publication date: Jul 2012, volume: 20, issue:4, pages: 478 - 487
Publisher: IEEE
 
» A Closed-Form Expression for the Exact Bit Error Probability for Viterbi Decoding of Convolutional Codes
Abstract:
In 1995, Best published a formula for the exact bit error probability for Viterbi decoding of the rate , memory (two-state) convolutional encoder with generator matrix when used to communicate over the binary symmetric channel. Their formula was later extended to the rate , memory (four-state) convolutional encoder with generator matrix by Lentmaier In this paper, a different approach to derive the exact bit error probability is described. A general recurrent matrix equation, connecting the average information weight at the current and previous states of a trellis section of the Viterbi decoder, is derived and solved. The general solution of this matrix equation yields a closed-form expression for the exact bit error probability. As special cases, the expressions obtained by Best for the two-state encoder and by Lentmaier for a four-state encoder are used. The closed-form expression derived in this paper is evaluated for various realizations of encoders, including rate and encoders, of as many as 16 states. Moreover, it is shown that it is straightforward to extend the approach to communication over the quantized additive white Gaussian noise channel.
Autors: Bocharova, I. E.;Hug, F.;Johannesson, R.;Kudryashov, B. D.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Jul 2012, volume: 58, issue:7, pages: 4635 - 4644
Publisher: IEEE
 
» A closed-loop data based test for robust performance improvement in iterative identification and control redesigns
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Autors:
Appeared in: Automatica
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A CMOS Rectifier With a Cross-Coupled Latched Comparator for Wireless Power Transfer in Biomedical Applications
Abstract:
A highly efficient rectifier for wireless power transfer in biomedical implant applications is implemented using 0.18- CMOS technology. The proposed rectifier with active nMOS and pMOS diodes employs a four-input common-gate-type capacitively cross-coupled latched comparator to control the reverse leakage current in order to maximize the power conversion efficiency (PCE) of the rectifier. The designed rectifier achieves a maximum measured PCE of 81.9% at 13.56 MHz under conditions of a low 1.5- RF input signal with a 1- output load resistance and occupies 0.009 of core die area.
Autors: Cha, H.-K.;Park, W.-T.;Je, M.;
Appeared in: IEEE Transactions on Circuits and Systems II: Express Briefs
Publication date: Jul 2012, volume: 59, issue:7, pages: 409 - 413
Publisher: IEEE
 
» A collector current model for InAlAs/InGaAsSb/InGaAs double heterojunction bipolar transistors with non-ideal effects
Abstract:


Autors:
Appeared in: Microelectronics Reliability
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A combination of parallel factor and independent component analysis
Abstract:


Autors:

Highlights

Appeared in: Signal Processing
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Combined Multiple Model Adaptive Control Scheme and Its Application to Nonlinear Systems With Nonlinear Parameterization
Abstract:
A combined multiple model adaptive control (CMMAC) scheme, which is a proper combination of the estimator-based MMAC scheme and the unfalsified MMAC scheme, has been proposed with the aim of taking advantage of the strength of each scheme while avoiding their weaknesses. The major novelty of the CMMAC scheme lies in the fact that it monitors not only the adequacy of candidate models in terms of their estimation performances but also the performance of the active candidate controller. As an application of the CMMAC scheme and one example of such new multiple model adaptive controllers, a CMMAC based controller has been designed for a class of nonlinear systems with nonlinear parameterization. Under some sufficient conditions, a strong finite time switching result (which provides a characterization on the maximum number of switching) and the closed-loop stability have been established. A constructive design based on back-stepping is provided for the adaptive control problem of a special class of nonlinearly parameterized systems, which can satisfy all the sufficient conditions to ensure closed-loop stability.
Autors: Chen, W.;Anderson, B. D. O.;
Appeared in: IEEE Transactions on Automatic Control
Publication date: Jul 2012, volume: 57, issue:7, pages: 1778 - 1782
Publisher: IEEE
 
» A combined surface stress and magneto-optical Kerr effect measurement setup for temperatures down to 30 K and in fields of up to 0.7 T
Abstract:
An optical 2-beam surface stress measurement and magneto-optical Kerr-effect has been combined with a liquid helium cooled cryostat. Sample temperatures down to 30 K and magnetic fields up to 0.7 T are achieved under UHV conditions. Low temperatures are exploited to obtain the first experimental data on the surface stress change induced by the adsorption of the noble gas Xe on Pt(111). High magnetic fields and low temperatures are used to characterize the magnetic properties of Co monolayers in longitudinal and polar Kerr geometries. The effective magnetic anisotropy is extracted from hard axis magnetization loops.
Autors: Premper, J.;Sander, D.;Kirschner, J.;
Appeared in: Review of Scientific Instruments
Publication date: Jul 2012, volume: 83, issue:7, pages: 073904 - 073904-8
Publisher: IEEE
 
» A Comment on “Joint elevation and Azimuth direction finding using L-shaped array”
Abstract:
A recent method proposed by J. Liang and D. Liu in “Joint elevation and Azimuth direction finding using L-shaped array,” IEEE Trans. Antennas Propag. vol. 58, no. 6, pp. 2136–2141, Jun., 2010, has a constraint that it cannot resolve the sources which share the same joint electric angle: . This comment proposes a solution to this constraint and validates the concept through a simulation example.
Autors: Qadir, S. G.;Yangyu, F.;
Appeared in: IEEE Transactions on Antennas and Propagation
Publication date: Jul 2012, volume: 60, issue:7, pages: 3546 - 3547
Publisher: IEEE
 
» A compact and low cost dosimetry system based on MOSFET for in vivo radiotherapy
Abstract:


Autors:
Appeared in: Sensors and Actuators A: Physical
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A compact, low jitter, nanosecond rise time, high voltage pulse generator with variable amplitude
Abstract:
In this paper, a compact, low jitter, nanosecond rise time, command triggered, high peak power, gas-switch pulse generator system is developed for high energy physics experiment. The main components of the system are a high voltage capacitor, the spark gap switch and R = 50 Ω load resistance built into a structure to obtain a fast high power pulse. The pulse drive unit, comprised of a vacuum planar triode and a stack of avalanche transistors, is command triggered by a single or multiple TTL (transistor-transistor logic) level pulses generated by a trigger pulse control unit implemented using the 555 timer circuit. The control unit also accepts user input TTL trigger signal. The vacuum planar triode in the pulse driving unit that close the first stage switches is applied to drive the spark gap reducing jitter. By adjusting the charge voltage of a high voltage capacitor charging power supply, the pulse amplitude varies from 5 kV to 10 kV, with a rise time of <3 ns and the maximum peak current up to 200 A (into 50 Ω). The jitter of the pulse generator system is less than 1 ns. The maximum pulse repetition rate is set at 10 Hz that limited only by the gas-switch and available capacitor recovery time.
Autors: Mao, Jiubing;Wang, Xin;Tang, Dan;Lv, Huayi;Li, Chengxin;Shao, Yanhua;Qin, Lan;
Appeared in: Review of Scientific Instruments
Publication date: Jul 2012, volume: 83, issue:7, pages: 075112 - 075112-6
Publisher: IEEE
 
» A comparative study of spacecraft attitude determination and estimation algorithms (a cost-benefit approach)
Abstract:


Autors:
Appeared in: Aerospace Science and Technology
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Comparison of Closed-Loop Control Algorithms for Regulating Electrically Stimulated Knee Movements in Individuals With Spinal Cord Injury
Abstract:
Functional electrical stimulation (FES) is the most commonly used technology for improving motor function in individuals who have spinal cord injury. Despite the wide range of FES applications reported in the literature, few electrical stimulation systems that can generate meaningful functional outcomes are currently available for use outside research laboratories. We tested proportional-integral-derivative, gain scheduling, and sliding mode control closed-loop control algorithms in a simulation of electrically induced knee extension against gravity to uncover some of the reasons why closed-loop control is not being more widely used in real-world FES systems. We also subjected the simulated FES system to muscle fatigue, muscle spasms, and the effects of muscle retraining. All of the controllers exhibited significantly degraded performance when these real-world nonlinear effects were included in the simulation. Moreover, all of the controllers were sensitive to variation in the parameters of the muscle recruitment function, which are subject to change during real-world FES use. We suggest several ways to improve the performance of closed-loop control algorithms for use in FES applications. We believe that closed-loop controllers have an important place in future FES applications, but the performance of these algorithms must be greatly improved before they can be implemented in real-world systems.
Autors: Lynch, C. L.;Popovic, M. R.;
Appeared in: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Publication date: Jul 2012, volume: 20, issue:4, pages: 539 - 548
Publisher: IEEE
 
» A Comparison of Methods for Estimating Track-to-Track Assignment Probabilities
Abstract:
We use the two-dimensional track-to-track assignment problem to analyze the trade-off between accuracy and runtime performance for three methods of estimating track-to-track assignment probabilities: enumeration of the $k$-best data association hypotheses, importance sampling (IS), and Markov chain Monte Carlo (MCMC) estimation. We also characterize the appropriate operating regime for each method.
Autors: Kragel, Bret;Herman, Shawn;Roseveare, Nick;
Appeared in: IEEE Transactions on Aerospace and Electronic Systems
Publication date: Jul 2012, volume: 48, issue:3, pages: 1870 - 1888
Publisher: IEEE
 
» A Comparison of Smart Grid Technologies and Progresses in Europe and the U.S.
Abstract:
This paper discusses historical and technical events in the U.S. and Europe over the last few years that are aimed at modernizing the electric power grid. The U.S. federal government has ratified the “smart grid initiative” as the official policy for modernizing the electricity grid including unprecedented provisions for timely information and control options to consumers and deployment of “smart” technologies. European countries are unified in researching and developing related technologies through various structures supported by the European Union. This paper presents the development of smart grids and an analysis of the methodologies, milestones, and expected evolutions of grid technologies that will transform society in the near future.
Autors: Simoes, M. G.;Roche, R.;Kyriakides, E.;Suryanarayanan, S.;Blunier, B.;McBee, K. D.;Nguyen, P. H.;Ribeiro, P. F.;Miraoui, A.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Jul 2012, volume: 48, issue:4, pages: 1154 - 1162
Publisher: IEEE
 
» A Comparison of the Finite-Element Method and Analytical Method for Modeling Unexploded Ordnance Using Magnetometry
Abstract:
Unexploded ordnance (UXO) is military ordnance that was fired, dropped, or emplaced but failed to function as intended and thus constitutes an explosive hazard. UXO is a worldwide problem that kills or maims thousands of civilians each year. Magnetic surveys are an efficient means of locating UXO containing ferrous metal when geologic conditions are sufficiently free of magnetic soil and rock. However, discrimination of UXO from non-UXO is complicated by the fact that UXO is often associated with high levels of clutter from ordnance fragmentation. To date, magnetic modeling of UXO has been based on calculations for a simple body of revolution geometry (prolate spheroids). We conducted an investigation to show how numerical modeling, in particular, finite-element modeling of more realistic geometries, compares to prolate spheroid results. Our results show that the calculated dipole moment response for complex models resembling actual UXO is up to 50% higher than the dipole moments for the prolate spheroid model. We also found that altering the shape of a model from a prolate spheroid to a complex shape has a greater effect on dipole moment than maintaining the same shape and altering the volume. Finally, in comparing the surface response from our models to real total field magnetic data, we find that complex models more closely match actual field data than prolate spheroid models. We suggest that modeling and, ultimately, discrimination using more realistic UXO shapes could result in significant improvements in distinguishing UXO from magnetic clutter and geology.
Autors: Churchill, K. M.;Link, C.;Youmans, C. C.;
Appeared in: IEEE Transactions on Geoscience and Remote Sensing
Publication date: Jul 2012, volume: 50, issue:7, pages: 2720 - 2732
Publisher: IEEE
 
» A complete SPICE subcircuit-based model library for organic photodiodes
Abstract:


Autors:

Graphical abstract

image

Appeared in: Solid-State Electronics
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Compliant Parallel XY Micromotion Stage With Complete Kinematic Decoupling
Abstract:
This paper presents a novel compliant parallel XY micromotion stage driven by piezoelectric actuators (PZT). With the purpose to obtain complete kinematic decoupling and good stiffness performance, the stage is designed using a symmetric 4-PP structure in which double four-bar flexure is chosen as the prismatic joint. Matrix method is employed to establish the compliance model of the mechanism. Based on the model, dynamic analysis is investigated after static analysis is carried out. The dimensions of the mechanism are optimized using the particle swarm optimization (PSO) algorithm in order to maximize the natural frequencies. Finite-element analysis (FEA) result indicates that the mechanism has an almost linear force-deflection relationship, high first natural frequency (720.52 Hz), and ideal decoupling property. To cope with the nonlinearities such as hysteresis that exists in the PZT, the control system is constructed by a proportional-integral-derivative (PID) feedback controller with a feedforward compensator based on Preisach model. The fabricated prototype has a 19.2 8.8 rectangular workspace with coupling less than 5%. The result of the closed-loop test shows that the XY stage can achieve positioning, tracking and contouring tasks with small errors.
Autors: Li, Y.;Huang, J.;Tang, H.;
Appeared in: IEEE Transactions on Automation Science and Engineering
Publication date: Jul 2012, volume: 9, issue:3, pages: 538 - 553
Publisher: IEEE
 
» A Comprehensive Analysis of the Absorption Spectrum of Conducting Ferromagnetic Wires
Abstract:
A detailed analysis of the absorption spectrum of conductive ferromagnetic wires is presented. The absorption spectrum is computed from the solution to the scattering problem, and circuit models are formulated to clarify the interplay between losses, skin effect, and wire geometry. Both infinitely long wires and the axial resonances introduced by finite-length wires are considered. The theoretical results are validated experimentally through measurements within a metallic rectangular waveguide.
Autors: Liberal, I.;Ederra, I.;Gomez-Polo, C.;Labrador, A.;Perez-Landazabal, J. I.;Gonzalo, R.;
Appeared in: IEEE Transactions on Microwave Theory and Techniques
Publication date: Jul 2012, volume: 60, issue:7, pages: 2055 - 2065
Publisher: IEEE
 
» A comprehensive integration infrastructure for embedded system design
Abstract:


Autors:
Appeared in: Microprocessors and Microsystems
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Computational Model for Predicting Protein Interactions Based on Multidomain Collaboration
Abstract:
Recently, several domain-based computational models for predicting protein-protein interactions (PPIs) have been proposed. The conventional methods usually infer domain or domain combination (DC) interactions from already known interacting sets of proteins, and then predict PPIs using the information. However, the majority of these models often have limitations in providing detailed information on which domain pair (single domain interaction) or DC pair (multidomain interaction) will actually interact for the predicted protein interaction. Therefore, a more comprehensive and concrete computational model for the prediction of PPIs is needed. We developed a computational model to predict PPIs using the information of intraprotein domain cohesion and interprotein DC coupling interaction. A method of identifying the primary interacting DC pair was also incorporated into the model in order to infer actual participants in a predicted interaction. Our method made an apparent improvement in the PPI prediction accuracy, and the primary interacting DC pair identification was valid specifically in predicting multidomain protein interactions. In this paper, we demonstrate that 1) the intraprotein domain cohesion is meaningful in improving the accuracy of domain-based PPI prediction, 2) a prediction model incorporating the intradomain cohesion enables us to identify the primary interacting DC pair, and 3) a hybrid approach using the intra/interdomain interaction information can lead to a more accurate prediction.
Autors: Jang, Woo-Hyuk;Jung, Suk-Hoon;Han, Dong-Soo;
Appeared in: IEEE/ACM Transactions on Computational Biology and Bioinformatics
Publication date: Jul 2012, volume: 9, issue:4, pages: 1081 - 1090
Publisher: IEEE
 
» A Computationally Efficient Technique for Prototyping Planar Antennas and Printed Circuits for Wireless Applications
Abstract:
In this paper, we present a novel procedure for an efficient and accurate electromagnetic simulation of microstrip circuits and printed antennas etched in layered media. The proposed approach, based on a new algorithm referred to herein as the equivalent medium approach (EMA), is applied for a rapid design of the preliminary desired circuit prototype. The illustrated technique yields reliable results and reduces the computational time in comparison with the conventional method of moments (MoM). Some examples that demonstrate the accuracy and the efficiency of the described procedure are included.
Autors: Mittra, R.;Bianconi, G.;Pelletti, C.;Du, K.;Genovesi, S.;Monorchio, A.;
Appeared in: Proceedings of the IEEE
Publication date: Jul 2012, volume: 100, issue:7, pages: 2122 - 2131
Publisher: IEEE
 
» A computationally efficient TLM thermal model in the beam displacement modulation regime
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Autors:
Appeared in: Microelectronics Journal
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Concurrent Approach to Reducing Environmental Impact of Product Development at the System Design Stage
Abstract:
This paper presents a computational framework for reducing environmental impact of product development in consideration of product design, manufacturing, and the supply chain concurrently. This framework incorporates a number of factors that ecologically influence the product lifecycle activities into product architecture design. They allow a systematic variation of manufacturing bill of materials. CAD-based functions are developed to ensure that the variation results satisfy product functional requirements and are interference-free during assembly. A cradle-to-gate lifecycle assessment is conducted on the bill of materials. Optimization schemes are integrated with the variation process to search for optimal results. This work realizes sustainable product development by offering a tool of ecological decision making in the system design stage.
Autors: Chu, C.-H.;Su, J. C. P.;Chen, Y.-T.;
Appeared in: IEEE Transactions on Automation Science and Engineering
Publication date: Jul 2012, volume: 9, issue:3, pages: 482 - 495
Publisher: IEEE
 
» A continuum theory of thermoelectric bodies and effective properties of thermoelectric composites
Abstract:


Autors:
Appeared in: International Journal of Engineering Science
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A control-theoretic approach to disseminating values and overcoming malicious links in wireless networks
Abstract:


Autors:
Appeared in: Automatica
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Convex Model for Nonnegative Matrix Factorization and Dimensionality Reduction on Physical Space
Abstract:
A collaborative convex framework for factoring a data matrix into a nonnegative product , with a sparse coefficient matrix , is proposed. We restrict the columns of the dictionary matrix to coincide with certain columns of the data matrix , thereby guaranteeing a physically meaningful dictionary and dimensionality reduction. We use regularization to select the dictionary from the data and show that this leads to an exact convex relaxation of in the case of distinct noise-free data. We also show how to relax the restriction-to- constraint by initializing an alternating minimization approach with the solution of the convex model, obtaining a dictionary close to but not necessarily in . We focus on applications of the proposed framework to hyperspectral endmember and abundance identification and also show an application to blind source separation of nuclear magnetic resonance data.
Autors: Esser, E.;Moller, M.;Osher, S.;Sapiro, G.;Xin, J.;
Appeared in: IEEE Transactions on Image Processing
Publication date: Jul 2012, volume: 21, issue:7, pages: 3239 - 3252
Publisher: IEEE
 
» A coordinated voltage/reactive power control method for multi-TSO power systems
Abstract:


Autors:

Highlights

Appeared in: International Journal of Electrical Power & Energy Systems
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A coupled mathematical model for simultaneous microwave and convective drying of wheat seeds
Abstract:


Autors:

Highlights

Appeared in: Biosystems Engineering
Publication date: Jul 2012
Publisher: Elsevier B.V.
 
» A Cross-Layer-Based Topology Control Framework for Wireless Multihop Networks
Abstract:
In this paper, we propose a distributed and asynchronous topology control framework for wireless multihop networks, aiming at improving the quality-of-service capabilities of such systems. The proposed mechanisms exploit cross-layer information such as physical-layer signal-to-interference-plus-noise ratio (SINR) values and medium-access-control (MAC)/network-layer connectivity to effectively allocate resources. Based on properly defined utility functions, we cast the transmission power allocation problem as a noncooperative game and then show that it belongs to the class of potential games. We obtain structural properties of the defined game and its variations and demonstrate their effectiveness. Through analysis and simulation, we explore the behavior of the proposed framework and compare it with the most relevant approach in the literature. It is shown that the proposed unifying game-theoretic framework achieves three key goals for multihop ad hoc networks, i.e., reduced transmission power, high-quality links, and connectivity maintenance.
Autors: Manolakos, A.;Karyotis, V.;Papavassiliou, S.;
Appeared in: IEEE Transactions on Vehicular Technology
Publication date: Jul 2012, volume: 61, issue:6, pages: 2858 - 2864
Publisher: IEEE
 
» A Current Source Converter-Based Active Power Filter for Mitigation of Harmonics at the Interface of Distribution and Transmission Systems
Abstract:
A medium-power current source converter (CSC)-based shunt active power filter (APF) system is designed and implemented to suppress the amplification of low-order harmonics at the medium-voltage (MV) interface bus between the distribution and transmission systems, owing to the presence of large shunt capacitor banks installed only for reactive power compensation. Four CSC-based APF modules designed at 1.0 kV are operated in parallel and connected to the 31.5-kV MV bus via a specially designed coupling transformer. In each APF module, a specially designed LC-type input filter eliminates the switching ripples, and active damping method embedded into the control software suppresses harmonic frequencies around the corner frequency of the input filter. The resulting system can operate at relatively high frequencies in the range from 2.0 to 3.0 kHz, depending upon which selected harmonics among 5th, 7th, 11th, and 13th are to be eliminated. Furthermore, in order to reduce the installed capacity of CSCs, selective harmonic amplification method is applied to the APF system described in the paper. MV APF system has been built as a mobile system for temporary connection to a problematic MV interface bus until a permanent solution is found for that location in the distribution system.
Autors: Terciyanli, A.;Avci, T.;Yilmaz, İ.;Ermis, C.;Kose, K. N.;Acik, A.;Kalaycioglu, A. S.;Akkaya, Y.;Cadirci, I.;Ermis, M.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Jul 2012, volume: 48, issue:4, pages: 1374 - 1386
Publisher: IEEE
 

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