CMOS Automatic Gain Control Circuit with DC Offset Cancellation for FM/cw Ladar

This paper presented an automatic gain control （AGC） circuit suitable for FM/cw ladar. The proposed architecture was based on two-stage variable gain amplifier （VGA） chain with a novel DC offset canceller circuit, which contained an improved Gilbert cell and a Gm-C feedback loop. To keep the VGA wit...

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Published inTransactions of Tianjin University Vol. 20; no. 4; pp. 310 - 314
Main Author 赵毅强 徐敏 庞瑞龙 于海霞 赵宏亮
Format Journal Article
LanguageEnglish
Published Heidelberg Tianjin University 01.08.2014
Subjects
CMOS工艺
Engineering
Gilbert单元
Humanities and Social Sciences
Mechanical Engineering
multidisciplinary
Science
可变增益放大器
激光雷达
直流偏移
自动增益控制电路
automatic gain control (AGC)
variable gain amplifier (VGA)
exponential gain control
DC offset canceller (DCOC)
exponen-tial gain control
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Summary:This paper presented an automatic gain control （AGC） circuit suitable for FM/cw ladar. The proposed architecture was based on two-stage variable gain amplifier （VGA） chain with a novel DC offset canceller circuit, which contained an improved Gilbert cell and a Gm-C feedback loop. To keep the VGA with a linearity in dB characteristic, an improved exponential gain control circuit was introduced. The AGC was implemented in 0.18 gm standard CMOS process. Simulation and measurement results verified that its gain ranged from -20 dB to 30 dB, and band- width ranged from 100 kHz to 10 MHz. Its power consumption was 19.8 mW under a voltage supply of 3.3 V.
Bibliography:Zhao Yiqiang, Xu Min, Pang Ruilong , Yu Haixia, Zhao Hongliang （1. School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China; 2. College of Physics, Liaoning University, Shenyang 110036, China）
12-1248/T
This paper presented an automatic gain control （AGC） circuit suitable for FM/cw ladar. The proposed architecture was based on two-stage variable gain amplifier （VGA） chain with a novel DC offset canceller circuit, which contained an improved Gilbert cell and a Gm-C feedback loop. To keep the VGA with a linearity in dB characteristic, an improved exponential gain control circuit was introduced. The AGC was implemented in 0.18 gm standard CMOS process. Simulation and measurement results verified that its gain ranged from -20 dB to 30 dB, and band- width ranged from 100 kHz to 10 MHz. Its power consumption was 19.8 mW under a voltage supply of 3.3 V.
automatic gain control （AGC） ; variable gain amplifier （VGA） ; DC offset canceller （DCOC） ; exponential gain control
ISSN:1006-4982
1995-8196
DOI:10.1007/s12209-014-2084-2