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德州仪器--有源低通滤波器设计ActiveLow-passFilterDesignApplicationReportSLOA049A-October2000ActiveLow-PassFilterDesignJimKarkiABSTRACTThisreportfocusesonactivelow-passfilterdesignusingoperationalamplifiers.Low-passfiltersarecommonlyusedtoimplementantialiasfiltersindata-acquisitionsystems.Designofsecond-orderfiltersisthemaintopicofconsideration.Filtertablesaredevelopedtosimplifycircuitdesignbasedontheideaofcascadinglowerorderstagestorealizehigher-orderfilters.ThetablescontainscalingfactorsforthecornerfrequencyandtherequiredQofeachofthestagesfortheparticularfilterbeingdesigned.Thisenablesthedesignertogostraighttothecalculationsofthecircuit-componentvaluesrequired.Toillustrateanactualcircuitimplementation,sixcircuits,separatedintoth……