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1、Maxim/Dallas>设计资料库>应用笔记>滤波器电路(模拟)视频电路关键词:analogfilterdesign,Butterworth,Chebyshev,Bessel,transferfunctions,2ndordersection,secondordersection,RCfilters相关型号 APP1795:Dec03,2002 下载，PDF格式(105kB)APPLICATIONNOTE1795AnalogFilterDesignDemystifiedAbstract:Thisarticleshowshowtodesignanalogfilters.Itstartsbyc
2、overingthefundamentalsoffilters,goesontointroducethebasictypeslikeButterworth,Chebyshev,andBessel,andthenguidesthereaderthroughthedesignprocessforlowpassandhighpassfilters.Includedarethederivationoftheequationsandthecircuitimplementation.It'sajungleoutthere.Asmalltribe,inthedensewilderness,ismuchsou
3、ghtafterbyheadhuntersfromthesurroundingplains.Knownthroughoutthelandfortheiresotericexpertise,thisisthetribeoftheAnalogEngineers,wholiveinthefarthestregionsofthelefthalfPlains,pastthejunglesofLaplace.TheguruofanalogengineersistheAnalogFilterDesigner,whositsonthethroneofhiskingdomandimpartswisdom.You
4、nevergettoseehim,evenwithanappointment,andyoucallhim"Sir."Thecountlesspagesofequationsfoundinmostbooksonfilterdesigncanfrightensmalldogs,anddigitaldesigners.Thisarticleclearsapaththroughthebrushforthepracticalengineerandunravelsthemysteryoffilterdesign,enablingyoutodesigncontinuous-timeanalogfilters
5、quicklyandwithaminimumofmathematics.TheTheoryofAnalogElectronicsAnalogelectronicshastwodistinctsides:thetheorytaughtbyacademicinstitutions(equationsofstability,phase-shiftcalculations,etc.),andthepracticalsidefamiliartomostengineers(avoidoscillationbytweakingthegainwithacapacitor,etc.).Unfortunately
6、,filterdesignisbasedfirmlyonlong-establishedequationsandtablesoftheoreticalresults.Filterdesignfromtheoreticalequationscanprovearduous.Consequently,thisdiscussionemploysaminimumofmath—eitherintranslatingthetheoreticaltablesintopracticalcomponentvalues,orinderivingtheresponseofageneral-purposefilter.
7、TheFundamentalsSimpleRClowpassfiltershavethetransferfunction:Cascadingsuchfilterscomplicatestheresponsebygivingrisetoquadraticequationsinthedenominatorofthetransferfunction.Thus,thedenominatorofthetra
