Adjusting the TGP1439 5-Bit Phase Shifter to Perform as 4-Bit or 3-Bit Phase Shifters



Category: Telephone, cellular phone and intercom
Manufacture: TriQuint Semiconductor
Datasheet: Download this application note


Description:
Product Application Note
Adjusting the TGP1439 5-Bit Phase Shifter to Perform as 4-Bit or 3-Bit Phase Shifters
Background: The TGP1439 device was originally designed as a 5-bit phase-shifter. This device can also be implemented as a 4-bit and 3-bit phase shifter by adjusting the voltage of Bond Pads 9, 10, and 11 of this device. Method: Tests were performed to determine which combination of biases applied to Bond Pads 9, 10, and 11 would result in optimal performance of the 4-bit and 3-bit phaseshifters. 4-Bit Phase Shifter: Bond Pad 11 of the TGP1439 is connected to a constant voltage for 4-bit operation. Pad 11 controls the least significant bit (11.25) of the 5-bit phase-shifter. Tests were performed to determine the Bond Pad 11 bias condition for optimum 4-bit operation. Data was taken to support a control voltage of -2.5V and 5V. TEST 1 2 Pad 11 0.0V Vcntl
Test Conditions for the 4-bit Phase Shifter
3-Bit Phase Shifter: Bond Pads 9, 10, and 11 of the TGP1439 are connected to a constant voltage for 3-bit operation. Pads 9 and 10 controls the second least significant bit (22.5) of the 5-bit phase-shifter. Pads 9 and 10 are complimentary in that when pad 10 is biased, pad 9 must be grounded, and vice versa. The four tests shown in the table below were performed to determine the Bond Pads 9, 10, and 11 bias conditions for optimum 3-bit operation. Data was taken to support a control voltage of -2.5V and 5V. TEST 1 2 3 4 Pad 11 0.0V 0.0V Vcntl Vcntl Pad 10 0.0V Vcntl 0.0V Vcntl Pad 9 Vcntl 0.0V Vcntl 0.0V
Test Conditions for the 3-bit Phase Shifter
Recommended Approach: TriQuint recommends that the device be biased in the following way to achieve the optimal 4-bit and 3-bit performance. 4-bit Phase Shifter: Ground Bond Pad 11. 3-bit Phase Shifter: 1. Ground Bond Pad 11. 2. Set Bond Pad 10 to the control voltage (-2.5V to 5V). 3. Ground Bond Pad 9 Refer to the mechanical drawing for further clarification.

 
0-C     D-L     M-R     S-Z