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1、附录二：英文原文TheAnalysisandDesignofWaveformGeneratorXuelian,WangFan,ZhengJin-faEngineeringandCommerceCollege,South-CentralUniversityforNationalities,WuhanHubeiAbstract:Inthispaper,thesinusoidalwavesindifferentfrequencyweresynthesizedintosquarewaveaccording
2、tothemethodofFourierseries.Firstly,theneededsinusoidalwaveswereachievedthroughthesquarewavegenerationcircuit,thefrequencydivisioncircuitandthefiltercircuit;then,afterthesinusoidalwaves’phasepositionwereshiftedandsynthesized,thesquarewavewasgenerated.T
3、hiscircuitinthismethodwasmorecheaperthanothercircuits(eg:DDS).Keywords:WaveformGenerator;SinusoidalWave;Filter;PhasePositionShift1waveformsynthesissystemoverviewThisisdesignedtosimulatetheprocessofsignalsynthesis.ForasquarewavesignalbyFourierseriesspr
4、eadknowable,itcandecomposetheamplitudeofthemorespecificforunlimitedoddharmonics,sointurnaslongasinfinitemultipleoddharmoniccomponent,theamplitudeandtheharmonicproportioninaparticularsuperposition,alsowillcertainlygetasquarewavesignal.Thispaperisthesim
5、ulatedthebasewaveandthreeharmonicharmoniccomponentsynthesisprocessofsquarewavesignal.Theoreticallyspeaking,theharmoniccomponents,syntheticwaveformwillmoreclosetothestandardsquareboboshape.Thissystembeginwithasquarewaveoscillatortogenerateafrequencyof6
6、0KHzpulsesignal,againintoseparatefrequencydevice10KHztogetafrequencyforhandlingofsquarewavesignalandafrequencyofsquarewavesignalfor30KHz,thenrespectivelythroughthefilterprocessingforthesinesignaland30KHz10KHztoclose-spaced10KHzsinewaveasbasewavecompon
7、ent,30KHzsinewaveasthreetimes,throughmodulationcircuitharmonicsofadjustthemrespectivelyinfengfengvalue,cansatisfy2V6VandFourierseriesspreadcoefficientratio;Putthesinesignalsinto10KHztophaseshifterphaseadjuster,andafter30KHzsinusoidalsignaltogetherinto
8、additioncircuitsynthesis,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Figure1systemstr
