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时间: 2019-12-24 20:27
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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……