一种高性能共模反馈CMOS运算放大器  

CMOS Operational Amplifier with HighPerformance CMFB Circuit

作　　者：张奉江[1] 吴贵能[1] 张红[1] 张正璠[2] 

机构地区：[1]重庆邮电大学,重庆400065 [2]模拟集成电路国家重点实验室

出　　处：《微电子学》2007年第3期407-410,共4页Microelectronics

摘　　要：介绍了一种具有高增益,高电源抑制比(CMRR)和大带宽的两级共源共栅运算放大器。此电路在两级共源共栅运算放大器的基础上增加共模反馈电路,以提高共模抑制比和增加电路的稳定性。电路采用0.35μm标准CMOS工艺库,在Cadence环境下进行仿真。结果显示,该放大器增益可达到101 dB,负载电容为10 pF时,单位增益带宽大约为163 MHz,共模抑制比可达101dB,电路功耗仅为0.5 mW。A 2-stage cascode operational amplifier with high gain, high CMRR and large bandwidth is presented. With common-mode feedback circuit, the 2-stage cascode op-amp can achieve high CMRR and frequency stability. Results from simulation based on standard CMOS 0. 35 μm technology show that the op-amp has a gain up to 101 dB,a unity gain bandwidth of about 163 MHz for a 10 pF load, and a CMRR up to 101 dB, with only 0. 5 mW of power.

关 键 词：共源共栅运算放大器 共模反馈电路 共模抑制比 

分 类 号：TN432[电子电信—微电子学与固体电子学]