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1、附录二：英文原文TheAnalysisandDesignofWaveformGeneratorXuelian,WangFan,ZhengJin-faEngineeringandCommerceCollege,South-CentralUniversityforNationalities,WuhanHubei430065Abstract:Inthispaper,thesinusoidalwavesindifferentfrequencyweresynthesizedintosquarewaveaccordingtothemethodofFourierseries.Fi
2、rstly,theneededsinusoidalwaveswereachievedthroughthesquarewavegenerationcircuit,thefrequencydivisioncircuitandthefiltercircuit;then,afterthesinusoidalwaves’phasepositionwereshiftedandsynthesized,thesquarewavewasgenerated.Thiscircuitinthismethodwasmorecheaperthanothercircuits(eg:DDS).Ke
3、ywords:WaveformGenerator;SinusoidalWave;Filter;PhasePositionShift1waveformsynthesissystemoverviewThisisdesignedtosimulatetheprocessofsignalsynthesis.ForasquarewavesignalbyFourierseriesspreadknowable,itcandecomposetheamplitudeofthemorespecificforunlimitedoddharmonics,sointurnaslongasinf
4、initemultipleoddharmoniccomponent,theamplitudeandtheharmonicproportioninaparticularsuperposition,alsowillcertainlygetasquarewavesignal.Thispaperisthesimulatedthebasewaveandthreeharmonicharmoniccomponentsynthesisprocessofsquarewavesignal.Theoreticallyspeaking,theharmoniccomponents,synth
5、eticwaveformwillmoreclosetothestandardsquareboboshape.Thissystembeginwithasquarewaveoscillatortogenerateafrequencyof60KHzpulsesignal,againintoseparatefrequencydevice10KHztogetafrequencyforhandlingofsquarewavesignalandafrequencyofsquarewavesignalfor30KHz,thenrespectivelythroughthefilter
6、processingforthesinesignaland30KHz10KHztoclose-spaced10KHzsinewaveasbasewavecomponent,30KHzsinewaveasthreetimes,throughmodulationcircuitharmonicsofadjustthemrespectivelyinfengfengvalue,cansatisfy2V6VandFourierseriesspreadcoefficientratio;Putthesinesignalsinto10KHztophaseshifterphaseadj
7、uster,andafter30KHzsinusoidalsignaltogetherintoadditioncircuitsynthesis,namelycompletesignalstack.Itcanbeinferredthattheoutputsignalisadderanapproximatesquare-wavesignal,andfrequencyforprobably10KHz.Systemunitcircuitasshowninfigure1below.方波发生电路分频电路滤波电路10Khz调幅30KHz调幅移相电路加法电路Figure1sys
