EPOT Applications: Offset Adjustment in Op-Amp Circuits

Abstract:Insomeelectronicsystems,aDCoffsetvoltageattheinputswillcontributeasignificanterrortotheoutput.Thisisespeciallytrueinhighgainconfigurations.Anoffsetadjustmentcircuitcanbeaddedto"null"outtheoffsetvoltage,makinghighgainstagespracticalevenwithsignificantinputoffsetvoltagesfoundinopampcircuits.Maxim>AppNotes>AmplifierandComparatorCircuitsDigitalPotentiometersKeywords:offsetadjust,offsetadjustment,opamp,nullingcircuits,nullingopamps,DCoffsetvoltage,Sep17,2001opampsAPPLICATIONNOTE803EPOTApplications:OffsetAdjustmentinOp-AmpCircuitsAbstract:Insomeelectronicsystems,aDCoffsetvoltageattheinputswillcontributeasignificanterrortotheoutput.Thisisespeciallytrueinhighgainconfigurations.Anoffsetadjustmentcircuitcanbeaddedto"null"outtheoffsetvoltage,makinghighgainstagespracticalevenwithsignificantinputoffsetvoltagesfoundinopampcircuits.ElectronicPotentiometers(EPOTS)offerdesignerstheopportunitytocontrolaresistanceviaadigitalinterfaceandcanbeusedinplaceofmechanical