1.5-V 900-μW 40-dB CMOS variable gain amplifier

Abstract

This paper describes the design and implementation of a low-voltage high-frequency variable gain amplifier in a 0.35-μm CMOS technology. The proposed circuit employs source degeneration and current feedback techniques to achieve high linearity and wide bandwidth. Experimental results show that the overall amplifier (including output voltage buffer) has a linear-in-dB controllable gain range of 40-dB with more than 10-MHz bandwidth, while draining 600 μA from a 1.5-V power supply voltage. © 2006 IEEE.