带直流漂移校正的低功耗可编程增益放大器  

A Low Power Programmable Gain Amplifier with DC-Offset Correction

作　　者：刘畅[1] 郭桂良[1] 杜占坤[1] 阎跃鹏[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《微电子学》2011年第1期23-26,共4页Microelectronics

基　　金：国家科技重大专项(低功耗传感器网络核心芯片及片上系统研发与产业化)(2009ZX03006-006)

摘　　要：设计了一种应用于无线传感器网络RF射频前端芯片的可编程增益放大器(PGA)。该放大器由三级增益单元级联构成,每级单元均带直流漂移校正功能,7位数字端控制增益变化,且可灵活切断单级电源,降低PGA整体功耗。设计基于SMIC 0.18μm 1.8 V 1P6 M CMOS工艺。流片测试结果表明,该放大器工作性能良好,动态范围为0～60 dB,1 dB步进,增益以dB线性变化,最大可校正输入直流漂移为200 mV,直流漂移校正时间约为10μs,带宽为6 MHz,整体功耗仅为1.8 mW。A programmable gain amplifier（PGA） was designed for RF front-end circuits of large-scale wireless sensor network.The amplifier was composed of three serial stages,each of which had the function of DC-offset correction.7 digital bits were used to control gain change,and flexibly cut off the power of a single stage,so as to reduce the total power consumption.The circuit was implemented in SMIC＇s 0.18 μm 1.8 V CMOS process.Measurement results showed that the PGA,which performed properly,had a dynamic range of 0～60 dB with 1-dB step resolution,and the gain changed in linear-in-dB.The DC-offset cancellation,which took about 10 μs,enabled the PGA to tolerate an input offset voltage up to 200 mV.The bandwidth of the PGA was 6 MHz,and total power consumption was 1.8 mW.

关 键 词：可编程增益放大器 直流漂移校正 DB线性 

分 类 号：TN402[电子电信—微电子学与固体电子学] TN722