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
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