Lowpass Filter Has Improved Step Response

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Abstract:Addingoptimizationcircuitrytoalowpassfilterallowsthefiltertoadjustitscutofffrequencydynamically,preservingthestep-responsetimeforrelativelylowcutofffrequencies.Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSFILTERCIRCUITS(ANALOG)Keywords:lowpassfilter,stepresponse,time-domainresponse,signalconditioning,switched-capacitorfilter,Apr26,2004SCfilterAPPLICATIONNOTE3203LowpassFilterHasImprovedStepResponseAddingoptimizationcircuitrytoalowpassfilterallowsthefiltertoadjustitscutofffrequencydynamically,preservingthestep-responsetimeforrelativelylowcutofffrequencies.Acommonproblemwhendesigninglowpassfiltersforsignalconditioningistheireffectonthesystem'stime-domainresponse.Becausepushingthecutofffrequencylowerslowsthestepresponse,thesystemmayfailtorecognizesignificantchangesintime.TheFigure1circuitallowslowercutofffrequencies

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