AC耦合放大器无需直流偏置

摘要：单位增益运放缓冲而不需要为偏置电阻，电容传感器和其他高阻抗信号源。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:railtorailopamp,wideinputcommonmoderange,opampsAug27,2001APPLICATIONNOTE781AC-CoupledAmplifierRequiresNoDCBiasAbstract:Unitygainopampbufferscapacitivetransducerandotherhigh-impedancesignalsourceswithouttheneedforbiasresistors.Capacitivetransducersandotherhigh-impedancesignalsourcesusuallyrequireACcouplingandabufferamplifiertoconditionthesignal.Bufferstakemanyforms,butmostofthemcompromisesignalqualitythroughexternalresistorswhichprovideaDCpathfortheinputbiascurrent.Fortunately,recentimprovementsinopamptechnologyallowAC-coupledinputswithouttheneedforbiasresistors.Thesenewopampshaveinpu