电工电子技术课件 集成运放的工作原理

集成运放如何工作HowOpAmpsWork集成运放如何工作HowOpAmpsWork运算放大器threebasicpackagetypesdipcontain12or4opampsinternally运算放大器transistorsandresistorscouplecapacitorsandsomediodes运算放大器NABPackage8-PinCDIPorPDIPTopView运算放大器SplitSupplySingleSupply运算放大器运算放大器运算放大器200V/mV1mV=0.001V200V/0.001VGain=200,000×1V运算放大器200V/mV1mV=0.001V200V/0.001VGain=200,000×1V运算放大器Gain=200,0009V/200,000=0.000045Vdifferentialrequired运算放大器Gain=200,0009V/200,000=0.000045Vdifferentialrequired运算放大器运算放大器运算放大器运算放大器Vin=VoutFeedbackisachievedbyconnectingtheoutputbacktooneoftheinputsthisismostcommonlydonewiththeinvertinginputcreatingnegativefeedback.运算放大器运算放大器8ApplicationandlmplementationInformationinthefollowingapplicationssectionsisnotpartoftheTlcomponentspecification,andTldoesnotwarrantitsaccuracyorcompleteness.Tl'scustomersareresponsiblefordeterminingsuitabilityofcomponentsfortheirpurposes.Customersshouldvalidateandtesttheirdesignimplementationtoconfirmsystemfunctionality.NOTETheLM741isageneral-purposeamplifierthancanbeusedinavarietyofapplicationsandconfiqurations.Onecommonconfigurationisinanoninvertingampliferconfiauration,Inthisconfiauration,theoutputsignalisinphasewiththeinput(notinvertedasintheinvertingamplifierconfiguration),theinputimpedanceoftheamplifierishigh,andtheoutputimpedanceislow.Thecharacteristicsoftheinputandoutputimpedanceisbenetficralforapplicationsthatrequireisolationbetweentheinputandoutput,Nosignificantloadingwilloccurfromthepreviousstagebeforetheamplifier.Thegainofthesystemissetaccordinglysotheoutputsignalisafactorlargerthantheinputsignal.8.1ApplicationInformationHighinputimpedance.Lowoutputimpedance.Voltagegain=1VoltageFollower/BufferAmplifierVout=VinVout

VinAv==1运算放大器Feedbackresistor(Rf)Effectivelycontrollingtheamountofamplificationbetweentheinputandoutput.运算放大器InvertingVoltageAmplifierusingIC741Gain（Av）=﹣(R2/R1)运算放大器Non-InvertingVoltageAmplifierusingIC741Gain（Av）=1+(R2/R1)运算放大器USESFOROPAMPS运算放大器Differential运算放大器WheatstoneBridgeSensor-ActivatedAmplifier运算放大器IntegratorAnintegratorop-ampproducesanoutputvoltagethatisproportionaltoboththeamplitudeandthedurationoftheinputsignal.Integratorscanbeusedtomakeanalogtodigitalconvertersandwaveshapingcircuits.运算放大器DifferentiatorTheoutputisapproximatelydirectlyproportionaltotherat