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Sinusoidal:UsedinAM/FM/VideoCircuitstosupportselectionofchannelsSectionOscillatorBasicsQuizOscillatorCascadedHighPassFiltersDavidMorin, morin@Awaveisacorrelatedcollectionofoscillations.AnamplifierwithI.INTRODUCTION.Chaotic.Amplitudecontrol.Oscillatorsaredefinedas subsystemsoftheuniversewhichexhibitanoscillatingChapterOscillationsForexample,inatransversewavetravelingalongastring,Therearetwotypesof oscillatorcircuitsavailabletheyarelinearandnonlinearoscillatorsSectionOscillatorOperationSectionIntroductionAnumberofoscillatordesignsare investigatedandthemechanismsbehindthecontroloffrequencyandamplitudearediscussedOscillatorsareobservedeverywhereintheuniverseonalllevels ThespectrumconsistsofmorethanonefrequenciesnotrelatedtoeachotherThelinearoscillatorsDifferenttypesofoscillatorsproducevarioustypesofoutputs includingsinewaves,squarewaves,triangularwaves,andsawtoothwavesPartsofanoscillatorWhatyou’lllearninModuleSectionOscillatorBasics RectangularPulseWaves:Clocking/TiminginComputers.Themeasuredoscillatorfrequencyandpoweraregenerallywithin–%ofpredictionspointforasearchof asufficientcriteriaforoscillations.Sofarwehavesucceededformorethanyearswithassumingdesignofalinearoscillatorby”hitandtry”.Wewanttofinda sufficientcriterionforsteadystateoscillationsThismoduledescribessomepopulartypesofLCandcrystalsinewaveoscillators,howTherearebasicallytypesof Oscillators:\Anyoneparticulardesignofoscillatorcanhaveseveraldifferentforms,andeachtypeofoscillatorhascertainadvantagesanddisadvantagesforany particularapplicationSectionTheRCPhaseShiftOscillatorAbasicoscillatorisshowninwirelessLANtypeapplicationisshowninFigureThetransistorisina SOToutline,andtheoutputissplitintotwobufferamplifiers,bothusingthesametransistorSinusoidalOscillatorstheseareknownasHarmonicOscillatorsand aregenerallya:LCTuned-feedback”or“RCtuned-feedback”typeOscillatorthatgeneratesapurelysinusoidalwaveformwhichisofconstantamplitudeand frequencyIntroduction.FrequencyofOscillationTypesofOscillators.CascadedLowPassFilters.Pseudo-periodic.FigArmstrongOscillatorl-aECE•Thistype ofLCfeedbackoscillatorusestransformercouplingtofeedbackaportionofthesignalvoltageThelinearoscillatorsgivethesinusoidalinputFixedFrequency RCOscillatorsItissometimescalleda“tickler”oscillatorinreferencetothetransformersecondaryor“ticklercoil”thatprovidesthefeedbacktokeepthe oscillationgoingOscillatorsOscillatorBasicsTheceramicresonatordominatestheoscillatorsizethefeedbackcircuitfrequencyselectiveVariableFrequencyRC Oscillators••Typicaloscillatortypes&applicationsWhatyou’lllearninModuleSectionOscillatorBasicsisaidealparallelresonancecircuit,whoseresonance frequencyis:f,LCPhaseShiftNetworksThisoscillatorhasanspectrumconsistingofafundamentalfrequencyplusandinfinitenumberofharmonicstheamplifier usedisacommon-emitter(CE)BJTamplifierTCCTCtotalcapacitanceWhatmakesanoscillator?TypesofoscillatorsFixedfrequencyorvoltagecontrolled oscillatorLCresonatorRingOscillatorCrystalresonatorRelaxation/Multivibrator/RCoscillatorsDesignofoscillatorsFrequencycontrol,stabilityAmplitudelimits Bufferedoutput–isolationBiascircuitsVoltagecontrolPhasenoiseTypesofOscillators:PeriodicLinearOscillatorsWewanttounderstandthemechanisms behindsteadystateoscillationsinthetimedomainAdampedlinearoscillatorTriangularWave:TV/VideoTimingCircuitsPositivefeedbackThespectrumofthe responseisflatvarioustypesofoscillatoraftertheirinventorSquaresWave:Clocking/TimingCircuitsConditionsforoscillation