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1、AnalogFiltersUsingMATLABLarsWanhammarAnalogFiltersUsingMATLAB13LarsWanhammarDepartmentofElectricalEngineeringDivisionofElectronicsSystemsLinkopingUniversity¨SE-58183Linkoping¨Swedenlarsw@isy.liu.seISBN978-0-387-92766-4e-ISBN978-0-387-92767-1DOI10.1007/978-0-387-92767-1Spring
2、erDordrechtHeidelbergLondonNewYorkLibraryofCongressControlNumber:2008942084#SpringerScienceþBusinessMedia,LLC2009Allrightsreserved.Thisworkmaynotbetranslatedorcopiedinwholeorinpartwithoutthewrittenpermissionofthepublisher(SpringerScienceþBusinessMedia,LLC,233SpringStreet,New
3、York,NY10013,USA),exceptforbriefexcerptsinconnectionwithreviewsorscholarlyanalysis.Useinconnectionwithanyformofinformationstorageandretrieval,electronicadaptation,computersoftware,orbysimilarordissimilarmethodologynowknownorhereafterdevelopedisforbidden.Theuseinthispublicati
4、onoftradenames,trademarks,servicemarks,andsimilarterms,eveniftheyarenotidentifiedassuch,isnottobetakenasanexpressionofopinionastowhetherornottheyaresubjecttoproprietaryrights.Printedonacid-freepaperSpringerispartofSpringerScienceþBusinessMedia(www.springer.com)PrefaceThisboo
5、kwaswrittenforuseinacourseatLinkopingUniversityandtoaidthe¨electricalengineertounderstandanddesignanalogfilters.MostoftheadvancedmathematicsrequiredforthesynthesisofanalogfiltershasbeenavoidedbyprovidingasetofMATLABfunctionsthatallowssophisticatedfilterstobedesigned.Mostofth
6、esefunctionscaneasilybeconvertedtorununderOctaveaswell.Thefirstchaptergivesanoverviewoffiltertechnologies,terminology,andbasicconcepts.ApproximationofcommonfrequencyselectivefiltersandsomemoreadvancedapproximationsarediscussedinChapter2.Thereaderisrecommendedtocomparethestan
7、dardapproximationwithrespecttothegroupdelay,e.g.,Example2.5,andlearntousethecorre-spondingMATLABfunctions.Geometricallysymmetricfrequencytrans-formationsarediscussedaswellasmoregeneralsynthesisusingMATLABfunctions.Chapter3dealswithpassiveLCfilterswithlumpedelements.Thereader
8、maybelievethatthisisanoutdatedtechnology.However,itisstillbeingusedandmorei
