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1、—————————————————————————————VoltagecontroldesignofhighfrequencyLCoscillatorsStudent:Pxxx,physicsandinformationengineeringcollegesInstructor:xxx,JianghanUniversityInrecentyears,withtherapiddevelopmentofwirelesscommunicationtechnology,makethemarketforrfintegrat
2、edcircuithashadahugedemand.Intherfcircuit,thevoltagecontroloscillation(VCO)occupiedaveryimportantposition.Withawiderangeofapplications.Intheearlystagesoftheradiotechnologydevelopment,itisusedtoproducehigh-frequencyintransmittercarriervoltage,Asaspecializedsupe
3、rheterodynereceiversinthemachineoscillator,besendingandreceivingequipmentbasiccomponents.Nowtheuseofoscillatorismoreandmorewidely.Forexample:inradiocommunication,radio,andtelevisionequipmentusedtoproducetheneedofthecarrierandthemachineoscillationsignal;Intheel
4、ectronicmeasuringinstrumentsusedtoproduceallsortsoffrequencysinesignals,etc.DefinitionOscillatorissimplystatedafrequencysource,usuallyinaphaselockloop.Detailedsaidisthatadevicedon'tneedthesignaltotheirownmotivation,DcpowercanbetransformedintoAcpower.Generallyf
5、allintothepositivefeedbackandnegativeresistance.Theso-called"oscillating",Itsmeaningistoalludetoexchange,.Oscillatorincludesaneveroscillationtoprocessandfunctionofoscillation.Cancompletionfromdctoacpowertransformation,Thisdevicecanbecalled"oscillator".Oscillat
6、orworkingprincipleLCcircuitconsistingofcapacitorsandinductors,electricfieldandtheconversionofmagneticenergyproductionprocessfreeoscillation.Tomaintaintheoscillationalsohasapositivefeedbackamplifiercircuit,theLCoscillatorisdividedintoatransformercoupledandthree
7、-pointoscillator,manyapplicationsofquartzcrystalquartzcrystaloscillator,LCoscillatorwithanintegratedoperationalamplifier.Exactlythesamedevicecannotbeparametersinthestateofthepowerthemomentthetwotransistoroccursachange,thischangeduetoincreasinglystrongroleinthe
8、positivefeedback,leadingtoreachatemporarysteadystate.Duringthetemporarysteadystatetoanothertransistorbycapacitancegradually15—————————————————————————————chargeconductionorclosedst
