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1、Operationalamplifiertheoryandapplications1theprincipleofop-ampOpampisthemostwidelyusedofadevice,althoughthedifferentstructureofdifferentoperationalamplifier,buttheexternalcircuit,itscharacteristicsarethesame.Opampisusually4parts,biascircuits,inputstage,intermediate-level,outputlevel,which
2、isgenerallyusedinputstagedifferentialamplifiercircuit(inhibitorypower),themiddleclassingeneraltheuseofactiveloadcircuitloadsthetotalradio(increasethemagnification),thecomplementaryoutputstagegenerallysymmetricaloutputstagecircuit(drivecircuittoincreasethecapacityoftheload),hereisabriefint
3、roductionabouttherealizationofthespecificcomplex.Industries,anoperationalamplifierusedtomeasuretheperformanceofmanyoftheindicators,theactualoperationalamplifierisgenerallybelievedthattheclosertheidealopamp,thebetter,theclassroominvolved,weareonlyaskingtheequivalentinputresistanceofinfinit
4、y,infiniteopen-loopgain,Infact,therearemanyotherindicators,Iwill,areyouabriefintroduction,theperformanceofoperationalamplifiersincludingthefiveindicators,open-loopdifferential-modevoltageamplificationfactor,themaximumoutputvoltage,differential-modeinputresistance,outputresistance,commonmo
5、derejectionratioCMRR.(Open-loopdifferential-modeisthemagnificationontheintegrateddeliverywithoutadditionalfeedbackloopincaseofdifferential-modevoltageamplification.Maximumoutputvoltageissayingthatitreferstoacertainvoltage,theintegratedoperationalamplifierisnotthelargestoutputvoltagedistor
6、tionpeak-peak.differential-modeinputresistancereflectsthesizeofintegratedoperationalamplifierinputdifferential-modeinputsignaltoobtainthecurrentsizeofthesource.requiringthegreaterthebetter.reflectthesizeoftheoutputresistanceofanintegratedtransportonthesmall-signaloutputloadcapacity.CMRRsh
7、ownontheintegratedoperationalamplifiercommon-moderejectionofinputsignals,whichisdefinedwiththedifferentialamplifiercircuit.CMRRthebetter.)17Figure1op-ampcharacteristiccurveFigure2op-ampinputandoutputterminalmapFigure1isthecharacteristiccurveofamplifierisgenerallyuse
