A low power flexible PGA for software defined radio systems  

作　　者：李国锋 吴南健 

机构地区：[1]State Key Laboratory of Super Lattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2012年第5期120-125,共6页半导体学报（英文版）

基　　金：Project supported by the National High-Tech Research and Development Program of China(No.2009AA011606);the National Natural Science Foundation of China(No.60976023)

摘　　要：This paper proposes a new low power structure to improve the trade-off between the bandwidth and the power consumption of a programmable gain amplifier（PGA）.The PGA consists of three-stage amplifiers, which includes a variable gain amplifier and DC offset cancellation circuits.The cutoff frequency of the DC offset cancellation circuits can be changed from 4 to 80 kHz.The chip was fabricated in 0.13μm CMOS technology. Measurement results showed that the gain of the PGA can be programmed from -5 to 60 dB.At the gain setting of 60 dB,the bandwidth can be tuned from 1 to 10 MHz,while the power consumption can be programmed from 850μA to 3.2 mA at a supply voltage of 1.2 V.Its in-band OIP3 result is at 14 dBm.This paper proposes a new low power structure to improve the trade-off between the bandwidth and the power consumption of a programmable gain amplifier（PGA）.The PGA consists of three-stage amplifiers, which includes a variable gain amplifier and DC offset cancellation circuits.The cutoff frequency of the DC offset cancellation circuits can be changed from 4 to 80 kHz.The chip was fabricated in 0.13μm CMOS technology. Measurement results showed that the gain of the PGA can be programmed from -5 to 60 dB.At the gain setting of 60 dB,the bandwidth can be tuned from 1 to 10 MHz,while the power consumption can be programmed from 850μA to 3.2 mA at a supply voltage of 1.2 V.Its in-band OIP3 result is at 14 dBm.

关 键 词：low power DC offset programmable gain amplifier software defined radio 

分 类 号：TN925[电子电信—通信与信息系统]