摘要：这篇文章是一个很好的模拟滤波器的介绍。它涵盖了基本的第一和第二阶滤波器类型以及无源和有源滤波器的优点和缺点。它派生的和基本的双二阶实施，使用了几个运算放大器实现的例子进行了分析。
Maxim>AppNotes>AudioCircuitsFilterCircuits(Analog)Keywords:analogfilters,passivefilters,activefilters,sallen-key,statevariable,biquad,filters.Feb04,2003APPLICATIONNOTE1762ABeginner'sGuidetoFilterTopologiesAbstract:Thisarticleisanexcellentintroductiontoanalogfilters.Itcoversthebasicfirstandsecondorderfiltertypesaswellastheadvantagesanddisadvantagesofpassiveandactivefilters.Itderivesandanalyzesthebasicbiquadimplementationusingseveralopampimplementationexamples.Theworldoffilterdesignisoftenthoughtofasblackmagicbecauseofthemyriadofconfigurations,uniqueterminology,andcomplexequations.Thisapplicationnotewilllookatdifferentfiltertypes,shedsomelightontermino
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