可应用于零中频接收机的自动增益控制环路设计  

A Design of an Automatic Gain Control for Zero-IF Receiver

作　　者：郑家杰[1] 莫太山[2] 马成炎[2] 殷明[2] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]杭州中科微电子有限公司,杭州310053

出　　处：《电子器件》2010年第3期275-280,共6页Chinese Journal of Electron Devices

基　　金：核高基重大专项资助(2009ZX01031-002-008)

摘　　要：阐述了一种可用于零中频接收机的自动增益控制环路(AGC)的设计,应用一种并行补偿的直流失调消除电路,可有效抑制前级模块引入及电路本身失配导致的直流失调成分。相比传统的反馈式直流失调消除电路,该并行补偿电路具有抑制效果更好,更易实现较低下截止频率HPCF(High Pass Cutoff Frequency)的特点,同时不存在反馈式结构的稳定性问题。电路采用0.18μm CMOS工艺,1.8 V供电电源,可稳定输出700 mVp-p电压,增益动态范围为50 dB,3 dB带宽大于60 M,下截止频率低于10 kHz。电路输出直流失调电压小于5 mV,功耗4.31 mA,面积710μm×110μm。This paper presents a design of an Automatic Gain Control（AGC） for zero-IF receiver by utilizing a parallel compensation DC Offset Canceller which can effectively suppress DC Offset from the previous circuit and self-mismatch.It achieves better performance in DC Offset Cancellation and lower HPCF compared to conventional ones.And what＇s more,there is not stability problem existed in feedback configuration.The AGC is realized in 0.18 μm CMOS technology with 1.8 V power supply voltage providing a stable output signal of 700 mVp-p,a dynamic range of 50 dB and the 3 dB bandwidth of 60 MHz with a HPCF lower than 10 kHz.Moreover,the output DC Offset voltage is less than 5 mV while dissipating total current of 4.31 mA and area of 710 μm×110 μm.

关 键 词：AGC 零中频 直流失调 

分 类 号：TN850.3[电子电信—信息与通信工程]