运放和信号整形
运放和信号整形AMPLIFIERSFORSIGNALCONDITIONINGSECTION3AMPLIFIERSFORSIGNALCONDITIONINGWaltKester,JamesBryant,WaltJungINTRODUCTIONThissectionexaminesthecriticalparametersofamplifiersforuseinprecisionsignalconditioningapplications.OffsetvoltagesforprecisionICopampscanbeaslowas10Vwithcorrespondingtemperaturedriftsof0.1V/C.Chopperstabilizedopampsprovideoffsetsandoffsetvoltagedriftswhichcannotbedistinguishedfromnoise.Openloopgainsgreaterthan1millionarecommon,alongwithcommonmodeandpowersupplyrejectionratiosofthesamemagnitude.Applyingtheseprecisionamplifierswhilemaintainingtheamplifierperformancecanpresentsignificantchallengestoadesignengineer,i.e.,externalpass