监测小步变化的直流电压

摘要：简单的电平转换电路采用精密运算放大器跟踪小型直流电压的变化。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:opamp,lowinputoffsetvoltage,precision,operationalamplifierJul17,2002APPLICATIONNOTE1144MonitoringaSmallStepChangeofaDCVoltageAbstract:SimplelevelshiftingcircuitusingaprecisionopamptrackssmallDCvoltagechanges.Whenwewanttocapturealowlevel,longdurationsignalridingonamuchhigherDClevel,weneedtohaveadequateresolutionoftheinputstepandthecapacitytooffsetthelargeDClevel.Thisisafunctionthatcanbefoundintheoscilloscope,butwithlimitedrange.Thisapplicationnoteoutlinesthewaystoperformthismeasurement.LowInputDCVoltageAlongdurationtimewaveformlookslikeFigure1whenthesignalisobservedontheoscil