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A 47-dB linear CMOS variable gain amplifier using current squaring technique

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4 Author(s)
Xin Cheng ; Instn. of Electron., Chinese Acad. of Sci., Beijing, China ; Haigang Yang ; Tongqiang Gao ; Fei Liu

In this paper, a CMOS linear-in-dB variable gain amplifier (VGA) is presented. The VGA consists of exponential control block which includes a current squaring circuit, amplifier block and common mode feedback block. Based on the current squaring block which doubles the gain range, a 47dB (-20dB to 27dB) continuous gain range is achieved with a single-stage structure. Simulation results show that the VGA core consumes 3mA of current from a 1.2V supply and has a 3-dB bandwidth greater than 200MHz. The IIP3 and the input referred noise density are within the ranges of 3 to -17dBm and 5 to 68 nV/sqrt(Hz) respectively.

Published in:

Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on

Date of Conference:

6-9 Dec. 2010