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A 125 MHz-86 dB IM3 programmable-gain amplifier

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2 Author(s)
Cheng-Chung Hsu ; Dept. of Electron. Eng., Nat. Chiao-Tung Univ., Hsin-Chu, Taiwan ; Jieh-Tsorng Wu

A digitally programmable-gain amplifier (PGA) is realized using a 0.35 /spl mu/m CMOS technology. Constant bandwidth and high linearity are achieved by using a current-mode amplifier with resistor-network feedback. The PGA has a voltage gain varying from 0 dB to 19 dB with a bandwidth of 125 MHz. With 1 Vpp output, the third-order intermodulation (IM3) of the PGA is -86 dB at 10 MHz and -59 dB at 80 MHz. The distortion is also insensitive to the gain change. The circuit dissipates 21 mW from a 3.3 V supply.

Published in:

VLSI Circuits Digest of Technical Papers, 2002. Symposium on

Date of Conference:

13-15 June 2002