A Low Power Technique for Programmable Gain Amplifier with Controllable input/output Transconductance and Compensation Capacitor

Tetsuro OKURA  Shunsuke OKURA  Toshimasa MATSUOKA  Kenji TANIGUCHI 

Publication
C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)  Vol.J95-C  No.7  pp.131-138
Publication Date: 2012/07/01
Online ISSN: 1881-0217
Print ISSN: 1345-2827
Type of Manuscript: PAPER
Category: 
Keyword: 
programmable gain amplifier (PGA),  programmable transconductance,  programmable compensation capacitor,  switched-capacitor,  low-power, 

Full Text(in Japanese): PDF(883.9KB)

Summary: 
We propposed a novel low-power programmable gain amplifier (PGA) consisting of switched capacitor circuit. The input transconductance, output transconductance and compensation capacitors are programed in order to keep both the bandwidth and the phase margin constant over a wide gain range. A 40 MSps PGA with 0 dB to 30 dB gain range is designed with 0.25 µm CMOS process, where simulated results show the minimum and maximum current consumption to be 11.0 mA and 28.6 mA respectively depending on PGA gain. Similarly, the minimum and maximum output referred RMS (Root Mean Square) noise voltages are 133.6 µVrms and 2.2 mVrms respectively.