天津大学学报（英文版）
天津大學學報（英文版）
천진대학학보（영문판）
TRANSACTIONS OF TIANJIN UNIVERSITY
2014年
4期
310-314
,共5页
赵毅强%徐敏%庞瑞龙%于海霞%赵宏亮
趙毅彊%徐敏%龐瑞龍%于海霞%趙宏亮
조의강%서민%방서룡%우해하%조굉량
automatic gain control (AGC)%variable gain amplifier (VGA)%DC offset canceller (DCOC)%exponen-tial gain control
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 charac-teristic, an improved exponential gain control circuit was introduced. The AGC was implemented in 0.18mm 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.
