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首页 非线性器件振幅调制_失真和平衡对消课件

非线性器件振幅调制_失真和平衡对消课件.doc

非线性器件振幅调制_失真和平衡对消课件

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2017-11-08 0人阅读 举报 0 0 暂无简介

简介:本文档为《非线性器件振幅调制_失真和平衡对消课件doc》,可适用于高等教育领域

非线性器件振幅调制失真和平衡对消课件高频电子线路多媒体教学课件MultimediaTeachingCoursewareofHighFrequencyElectronicCircuits开始Start西安电子科技大学XidianUniversity开始Start课件简介Abriefintroductionofthecourseware封面Cover目录Content结束End封面Cover目录Content结束End本课件讲授大学本科《高频电子线路》课程的代表内容非线性器件振幅调制,失真和平衡对消。课件主要配合教师课堂教学使用,讲授过程中始终以教师讲述为主,课件只提供必要的文字和图像信息。学生本人使用该课件预习和复习功课时,可以选择向导的帮助。向导及时提供丰富的文字讲解,起到了教师指导的作用。因为集成了向导功能,本课件也可以作为网络课件使用。Thecoursewareismaterializedonnonlineardeviceamplitudemodulation,distortion,andbalancedcancellation,whicharerepresentativecontentsofHighFrequencyElectronicCircuits,acourseforundergraduatestudentsWiththemajorpurposetoassisttheclassroomlecturing,thecoursewareprovidesnecessaryliteralandimageinformationtohelptheteacher,whoplaysthemainroleinthelecturingThecoursewareitselfisalsoanetbasedoneTheintegratedguidetimelyprovidesdetailedliteralexplanationsforstudentsinpreparingandreviewingthecourseTheguidanceservesastheinstructionsfromteachers简介Introduction西安电子科技大学XidianUniversity简介Introduction简要帮助Aconcisehelp封面Cover目录Content返回Return封面Cover目录Content返回Return封面Cover封面Cover翻到封面Tothecover帮助Help帮助Help翻到帮助页面Tothehelppage没有向导的界面Theinterfacewithouttheguide目录Content目录Content翻到目录Tothecontent返回Return返回Return返回上一页Tothelastpage结束End结束End有向导的界面结束放映EndthescreeningTheinterfacewiththeguide帮助Help西安电子科技大学XidianUniversity帮助Help第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation封面Cover帮助Help结束End封面Cover帮助Help结束End您好,欢迎使用高频电子线路多媒体教学课件,请选择是否需要向导。Hello,您好,欢迎使用高频电子线路多媒体教学课件,请选择是否需要向导。Hello,welcometoTeachingCoursewareofHighFrequencyElectronicCircuitsPleasewelcometoTeachingCoursewareofHighFrequencyElectronicCircuitsPlease振幅调制方法的分类Typesofamplitudemodulationapproacheschooseifyouwillneedaguidechooseifyouwillneedaguide使用向导(便于浏览课件,课程预习和复习)UsetheguideForcoursewarebrowsing,coursepreparationandreviewing不使用向导(便于组织课堂教学)NoguideForclassroomlecturingorganization西安电子科技大学XidianUniversity向导Guide向导Guide第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation封面Cover帮助Help结束End封面Cover帮助Help结束End振幅调制与解调AmplitudemodulationAManddemodulation振幅调制方法Amplitudemodulationapproaches振幅调制信号Amplitudemodulatedsignals振幅调制的关键问题Keyproblemofamplitudemodulation振幅调制方法的分类Typesofamplitudemodulationapproaches非线性器件调幅Amplitudemodulationwithnonlineardevices非线性器件调幅分析AnalysisofnonlineardeviceAM步骤Stepone步骤Steptwo步骤Stepthree非线性器件调幅失真DistortionsofnonlineardeviceAM失真来源Sourceofdistortions减小失真的方法Methodstoreducedistortions平衡对消Balancedcancellation线性时变电路调幅AMwithlineartimevaryingcircuits西安电子科技大学XidianUniversity目录Content目录Content第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation目录Content帮助Help结束End目录Content帮助Help结束End为了生成这些信号,我们进行振幅调制时需要解决一个关键问题,即调制信号与载波的为了生成这些信号,我们进行振幅调制时需要解决一个关键问题,即调制信号与载波的振幅调制与解调AmplitudemodulationAManddemodulation相乘。Weneedtosolveakeyproblemintheamplitudemodulationtogeneratethese相乘。Weneedtosolveakeyproblemintheamplitudemodulationtogeneratethese振幅调制方法Amplitudemodulationapproachessignals,thatis,themultiplicationofthemodulatingsignalandthecarrierwavesignals,thatis,themultiplicationofthemodulatingsignalandthecarrierwave振幅调制信号Amplitudemodulatedsignals非线性器件的应用解决了前面提到的振非线性器件的应用解决了前面提到的振幅调制的关键问题,但又产生了新的失振幅调制的关键问题Keyproblemofamplitudemodulation幅调制的关键问题,但又产生了新的失真问题。Theabovementionedkey真问题。Theabovementionedkey振幅调制方法的分类Typesofamplitudemodulationapproaches为了解决失真问题,我们接下来寻找失感谢使用向导。首先,我们简略浏览本次课程的内容和结构。Thankyou为了解决失真问题,我们接下来寻找失problemofamplitudemodulationis我们从本次课程开始学习振幅调制方法,这是第五章,振幅调制与解调的一个感谢使用向导。首先,我们简略浏览本次课程的内容和结构。Thankyou我们从本次课程开始学习振幅调制方法,这是第五章,振幅调制与解调的一个problemofamplitudemodulationis真的来源,并由此提出减小失真的方法。forus非线性器件调幅ingtheguideAtfirAstm,leptl’istbudrieemflybodruowlatseitonhewconithtennontanlidnsetarrudcteuvireces真的来源,并由此提出减小失真的方法。重要部分。solvedbyuInstinhgnislonesslonine,waredbeevigicnestolearnapproachesofamplitudemodulation,forusingtheguideAtfirst,let’sbrieflybrowsethecontentandstructure重要部分。Inthislesson,webegintolearnapproachesofamplitudemodulation,solvedbyusingnonlineardevices首先,我们简要复习三种振幅调制信号,即Totacklethedistortionproblem,we’ll首先,我们简要复习三种振幅调制信号,即ofthislessonTotacklethedistortionproblem,we’llwhHicowhiesveanr,timhpedoritsantorttpionoroctioncuofrsCashanapteewr,Amplitudemodulationandofthisle非线性器件调幅分析ssonAnalysisofnonlineardeviceAMwhichisanimportantportionofChapter,AmplitudemodulationandHowever,thedistortionoccursasanew普通调幅信号,双边带调制信号和单边带调searchforthedistortionsource,and非线性器件调幅通过三个步骤普通调幅信号,双边带调制信号和单边带调searchforthedistortionsource,anddepmrodobulelmation非线性器件调幅通过三个步骤demodulationproblem步骤Stepone制信号。First,we’llbrieflyreviewthethree一种比较重要和常见的减小失真的方法是平衡对thenbringforwardmethodsfor来实现。Thenonlineardevice制信号。First,we’llbrieflyreviewthethree一种比较重要和常见的减小失真的方法是平衡对thenbringforwardmethodsfor来实现。Thenonlineardevicesignalsoutofamplitudemodulation,namely,消技术,这是本次课程最后要学习的内容。从分类上看,有两种基本方法可以解决该问题,即非线性器件调幅和线性时distortionreduction步骤Steptwoamplitudemodulationissignalsoutofamplitudemodulation,namely,消技术,这是本次课程最后要学习的内容。从分类上看,有两种基本方法可以解决该问题,即非线性器件调幅和线性时distortionreductionamplitudemodulationistheamBpallitanudceemdcodanuclatelleatdsionignisalan,thimedpouorbtanletandusual变电路调幅。本次课程学习非线性器件调幅。Forsolution,therearetwoperformedinthreestepstheamBpallitanudceemdcodanuclatelleatdsionignisalan,thimedpouorbtanletandusual变电路调幅。本次课程学习非线性器件调幅。步骤StepthreeForsolution,therearetwoperformedinthreestepssidebanmdemthododufloratdedisstiorgntalion,anreddtuhcetisonin,wglehichwillbebasictypesofamplitudemodulationapproach,namely,theamplitudesidebanmdemthododufloratdedisstiorgntalion,anreddtuhcetisonin,wglehichwillbebasictypesofamplitudemodulationapproach,namely,theamplitude非线性器件调幅失真DistortionsofnonlineardeviceAMsidebanstdumdieoddatulatthedeesnigndofalthislessonmodulationwithnonlineardevices,andtheamplitudemodulationwithsidebanstdumdieoddatulatthedeesnigndofalthislessonmodulationwithnonlineardevices,andtheamplitudemodulationwith失真来源SourceofdistortionslineartimevaryingcircuitsTheformeristobestudiedinthislessonlineartimevaryingcircuitsTheformeristobestudiedinthislesson减小失真的方法Methodstoreducedistortions平衡对消Balancedcancellation线性时变电路调幅AMwithlineartimevaryingcircuits继续Continue西安电子科技大学XidianUniversity目录Content目录Content第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation目录Content帮助Help结束End目录Content帮助Help结束End包含所有三个频率分量的信号称为普通调幅信号,包含所有三个频率分量的信号称为普通调幅信号,只包含上边频分量和下边频分量的信号称为双边调制信号Modulatingsignal只包含上边频分量和下边频分量的信号称为双边载波carrierwave带调制信号,而单边带调制信号则只有上边频分带调制信号,而单边带调制信号则只有上边频分utUcostutUcostmCCmC量或下边频分量中的一个。Thesignalwithall量或下边频分量中的一个。Thesignalwithallthreefrequencycomponentsiscalledanthreefrequencycomponentsiscalledan现在,我们开始学习本次课程的内容。进行振幅调制的目的是把低频现在,我们开始学习本次课程的内容。进行振幅调制的目的是把低频amplitudemodulatedsignalThatonlywiththeamplitudemodulatedsignalThatonlywiththe的语音、图象等调制信号寄载到高频载波上,从而实现信息的远程无U的语音、图象等调制信号Cm寄载到高频载波上,从而实现信息的远程无upperandthelowersidefrequencycomponentsupperandthelowersidefrequencycomponents为简单起见,我们认为调制信号和载波都是单频线传输。Now,let’sstartthelessonTheamplitudemodulationis为简单起见,我们认为调制信号和载波都是单频线传输。Now,let’sstartthelessonTheamplitudemodulationisiscalledadoublesidebandmodulatedsignalUiscalledadoublesidebandmodulatedsignalm信号。这里给出了它们的时域表达式。Foraimedatmountingthelowfrequencyaudioorvisualmodulating信号。这里给出了它们的时域表达式。ForaimedatmountingthelowfrequencyaudioorvisualmodulatingThesinglesidebandmodulatedsignalhasonlyThesinglesidebandmodulatedsignalhasonlysimplicity,themodulatingsignalandthecarriersignalontoahighfrequencycarrierwave,sothattheinformationcansimplicity,themodulatingsignalandthecarriersignalontoahighfrequencycarrierwave,sothattheinformationcanoneofthesidefrequencycomponentsoneofthesidefrequencycomponentswavearesupposedtobesinglefrequencysignalsbetransmittedwirelesslyatalongdistanceCCwavearesupposedtobesinglefrequCencysignalsCbetransmittedwirelesslyatalongdistanceThesearetheirtimedomainexpressionsThesearetheirtimedomainexpressions经过调制,得到的振幅调制信号可能包含三个频率分量。角频率为,和在频域上,调制信号和载波都可以普通调幅信号AmplitudemodulatedsignalCC经过调制,得到的振幅调制信号可能包含三个频率分量。角频率为,和在频域上,调制信号和载波都可以CC用其角频率和振幅表示。的频率分量可以分别叫做载频分量,上边频分量和下边频分量。TheAftertheC用其角频率和振幅表示。的频率分量可以分别叫做载频分量,上边频分量和下边频分量。TheAftertheC双边带调制信号Doublesidebandmodulatedsignalmodulatmionod,tulhateiobngstaiignnealdanamdptlhiteucdaremrioderulatedsignalmaycontainthreefrequencymodulatmionod,tulhateiobngstaiignnealdanamdptlhiteucdaremrioderulatedsignalmaycontainthreefrequencycomponweaventsTarheeosxpewreitshsetdhienanthguelarfrequenciesof,andareCCCcomponweaventsTarheeosxpewreitshsetdhienanthguelarfrequenciesof,andare单边带调制信号SinglesidebandmCodCulatedsignCaltermedfasretqhueecncarydriomercaiomnbpyuonesnint,tgthheeuirppersidefrequencycomponentandthelowertermedfasretqhueecncarydriomercaiomnbpyuonesnint,tgthheeuirppersidefrequencycomponentandthelowersidefreanquguenlcarycfromeqpuonenecnietsranespdectivelysidefreanquguenlcarycfromeqpuonenecnietsranespdectivelyamplitudesamplitudes继续Continue西安电子科技大学XidianUniversity第页Page第页Page第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation目录Content帮助Help结束End目录Content帮助Help结束End用非线性电路进行振幅调制的方法有两种,一种是利有源器件,如晶体管或场效应管的用非线性电路进行振幅调制的方法有两种,一种是利有源器件,如晶体管或场效应管的时域:uu非线性实现调幅,另一种是基于线性时变电路实现调幅。ThCerearetwotypesof非线性实现调幅,另一种是基于线性时变电路实现调幅。TherearetwotypesofTimedomain:amplitudemodulationapproachwiththeuseofnonlinearcircuitsOneapproachistoamplitudemodulationapproachwiththeuseofnonlinearcircuitsOneapproachisto振幅调制的关键问题uumakeusethenonlinearpropertyofactivedevices,suchasthetransistorandtheFETCmakeusethenonlinearpropertyofactivedevices,suchasthetransistorandtheFETKeyproblemofamplitudeTheotherapproachisbasedonlineartimevaryingcircuitsTheotherapproachisbasedonlineartimevaryingcircuits频域:,modulationCCFrequencydomain:,CC振幅调制方法Amplitudemodulationapproaches振幅调制方法Amplitudemodulationapproaches为了生成前面的三种振幅调制信号,进行振幅调制时,在时域上要为了生成前面的三种振幅调制信号,进行振幅调制时,在时域上要将调制信号和载波相乘,在频域上看,这样的相乘会生成上边频分将调制信号和载波相乘,在频域上看,这样的相乘会生成上边频分量和下边频分量,这个关键问题的解决需要用到非线性电路。In非线性器件调幅Amplitudemodulation量和下边频分量,这个关键问题的解决需要用到非线性电路。In非线性器件调幅Amplitudemodulationordertogeneratetheabovethreeamplitudemodulatedsignals,ordertogeneratetheabovethreeamplitudemodulatedsignals,withnonlineardeviceswithnonlineardevicesduringtheamplitudemodulation,themodulatingsignalwillbeduringtheamplitudemodulation,themodulatingsignalwillbemultipliedbythecarrierwaveinthetimedomain,whichwillmultipliedbythecarrierwaveinthetimedomain,whichwill线性时变电路调幅Amplitudemodulation线性时变电路调幅AmplitudemodulationproducetheupperandthelowersidefrequencycomponentsintheproducetheupperandthelowersidefrequencycomponentsinthewithlineartimevaryingcircuitswithlineartimevaryingcircuitsfrequencydomainNonlinearcircuitsaretobeusedtosolvethisfrequencydomainNonlinearcircuitsaretobeusedtosolvethiskeyproblemkeyproblem继续Continue西安电子科技大学XidianUniversity第页Page第页Page第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation目录Content帮助Help结束End目录Content帮助Help结束Endut经过E的偏置,产生晶体管的输入电压ut。beBBEut经过E的偏置,产生晶体管的输入电压ut。beBBEWiththebiasingofEuponut,wegetut,theBbeBEWiththebiasingofEuponut,wegetut,theBbeBEinputvoltageonthetransistorinputvoltageonthetransistoritC最后,it经由LC并联谐振回路选频,产生C最后,it经由LC并联谐振回路选频,产生C该图实际上给出了一个放大器电路。首先,载普通调幅信号ut。Finally,itflowsAMC该图实际上给出了一个放大器电路。首先,载普通调幅信号ut。Finally,itflowsAMCututBE波ut和调制信号ut叠加产生交流输入电throughthefrequencyselectingLCparallelCutC波ut和调制信号ut叠加产生交流输入电throughthefrequencyselectingLCparallelCAM压ut。Thediagramisactuallyanamplifierresonantcircuit,andproducesanamplitudebe压ut。Thediagramisactuallyanamplifierresonantcircuit,andproducesanamplitudebeutbecircuit,wherethecarrierwaveutandthemodulatedsignalutCAMcircuit,wherethecarrierwaveutandthemodulatedsignalutCAMmodulatingsignalutareaddedupfirsttomodulatingsignalutareaddedupfirsttout接下来,在ut的作用下,晶体管产生输出BE接下来,在ut的作用下,晶体管产生输出producethealternatinginputvoltageutBEbeproducethealternatinginputvoltageutbe电流it。Inthefollowing,thetransistorC电流it。Inthefollowing,thetransistorCgeneratestheoutputcurrentitinresponsetoCgeneratestheoutputcurrentitinresponsetoECECButBEutBE现在我们学习第一种振幅调制方法,即非线性器件调幅方法。该方法现在我们学习第一种振幅调制方法,即非线性器件调幅方法。该方法的原理电路如图所示。Nowwecometolearnthefirstamplitude的原理电路如图所示。Nowwecometolearnthefirstamplitudemodulationapproach,ie,thenonlineardeviceamplitudemodulationmodulationapproach,ie,thenonlineardeviceamplitudemodulationHereisthebasiccircuitdiagramofthisapproachHereisthebasiccircuitdiagramofthisapproach继续Continue西安电子科技大学XidianUniversity第页Page第页Page第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation目录Content帮助Help结束End目录Content帮助Help结束End步骤载波和调制信号现在我们实时观察ut,ut和uCbeut现在我们实时观察ut,ut和uCCbe相加产生输入电压t的波形。注意载波的频率远大于调t的波形。注意载波的频率远大于调制信号的频率,而其振幅也大于调制Addingupthecarrier制信号的频率,而其振幅也大于调制前面简要描述了非线性器件调幅的过程,在此基础首先,我们看第一个步骤。这是在输入级回路前面简要描述了非线性器件调幅的过程,在此基础首先,我们看第一个步骤。这是在输入级回路t信号的振幅。二者叠加产生的交流输waveandthe信号的振幅。二者叠加产生的交流输上,我们接下来观察并研究该过程中一些值得注意中完成的,载波ut和调制信号ut在这里C上,我们接下来观察并研究该过程中一些值得注意中完成的,载波ut和调制信号ut在这里C入电压ut的高频振荡与载波一致,be入电压ut的高频振荡与载波一致,modulatings的细节。非线性器件调幅的原理电路可以分解为输ignalto相叠加产生交流输入电压ut。First,let’sbebe的细节。非线性器件调幅的原理电路可以分解为输相叠加产生交流输入电压ut。First,let’sbe其起伏与调制信号同步。Now,let’s其起伏与调制信号同步。Now,let’s入级回路,晶体管和输出级回路三部分,每部分各focusonstepone,whichisaccomplishedintheproducetheinput入级回路,晶体管和输出级回路三部分,每部分各focusonstepone,whichisaccomplishedintheutmakearealtimeobservationofthemakearealtimeobservationofthe自完成振幅调制过程的一个步骤。Theprocessofinputloop,wherethecarrierwaveutandtheCvoltage自完成振幅调制过程的一个步骤。Theprocessofinputloop,wherethecarrierwaveutandtheCwaveformsofut,utandutItCbewaveformsofut,utandutItthenonlineardeviceamplitudemodulationhasmodulatingsignalutareaddeduptoCbethenonlineardeviceamplitudemodulationhasmodulatingsignalutareaddeduptoshouldbenoticedthatthecarrierwaveshouldbenoticedthatthecarrierwavebeenbrieflydescribed,basedonwhich,wenowproducethealternatinginputvoltageutbetbeenbrieflydescribed,basedonwhich,wenowproducethealternatinginputvoltageutbefrequencyismuchhigherthanthefrequencyismuchhigherthanthecometoobserveandstudysomedetailsinthecometoobserveandstudysomedetailsinthemodulatingsignalfrequencyThesamemodulatingsignalfrequencyThesameprocessThebasiccircuitcanbedecomposedintoprocessThebasiccircuitcanbedecomposedintocanbesaidoftheiramplitudesThecanbesaidoftheirampulitudetsThethreeparts,namely,theinputloop,thetransistor,ututBEthreeparts,namely,theinputloop,thetransistor,beCalternatinginputvoltageutoutofbealternatinginputvoltageutoutofandtheoutputloopEachpartofthecircuitbeandtheoutputloopEachpartofthecircuitutbetheadditionoscillatesaccordingtothetheadditionoscillatesaccordingtotheperformsonestepoftheamplitudemodulationperformsonestepoftheamplitudemodulationcarrierwave,whereasitrisesandfallsuttcarrierwave,whereasitrisesandfallsinaccordancewiththemodulatinginaccordancewiththemodulatingsignalEsignalB继续Continue西安电子科技大学XidianUniversity第页Page第页Page第五章振幅调制与解调ChapterAmplitudemodulationanddemodulation在该投影过程中,我们可以发在该投影过程中,我们可以发目录Content帮助Help结束End目录Content帮助Help结束End现,晶体管的非线性,更确切现,晶体管的非线性,更确切这样我们得到了it波形上的一个点。Therefore,onepointontheitCC地说,其转移特性的非线性,这样我们得到了it波形上的一个点。Therefore,onepointontheitCC地说,其转移特性的非线性,如果将波形放大,我们会注意到it的波形和ut这里给出了晶体管的转移特性CBE如果将波形放大,我们会注意到it的波形和utii这里给出了晶体管的转移特性CBEwaveformisobtainedCC引起了it波形的变化。InwCaveformisobtainedut引起了it波形的变化。In的波形并不一样。与ut比较而言,it的上半周C接下来,我们看第二个步骤。这是在晶体管中完C曲线,它描述了晶体管的输入BEC的波形并不一样。与ut比较而言,it的上半周接下来,我们看第二个步骤。这是在晶体管中完步骤曲线,它描述了晶体管的输入非线性器件产生BECtheprojectingp

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