提高低通滤波器的阶跃响应

摘要：添加一个低通滤波器的优化电路，使过滤器动态地调整其截止频率，保持相对较低的截止频率阶跃响应时间。

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