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1、压控高频LC振荡器的设计—————————————————————————————VoltagecontroldesignofhighfrequencyLCoscillatorsStudent:Pxxx,physicsandinformationengineeringcollegesInstructor:xxx,JianghanUniversityInrecentyears,withtherapiddevelopmentofwirelesscommunicationtechnology,makethemarketforrfintegratedcircuit
2、hashadahugedemand.Intherfcircuit,thevoltagecontroloscillation(VCO)occupiedaveryimportantposition.Withawiderangeofapplications.Intheearlystagesoftheradiotechnologydevelopment,itisusedtoproducehigh-frequencyintransmittercarriervoltage,Asaspecializedsuperheterodynereceiversinthemachi
3、neoscillator,besendingandreceivingequipmentbasiccomponents.Nowtheuseofoscillatorismoreandmorewidely.Forexample:inradiocommunication,radio,andtelevisionequipmentusedtoproducetheneedofthecarrierandthemachineoscillationsignal;Intheelectronicmeasuringinstrumentsusedtoproduceallsortsof
4、frequencysinesignals,etc.DefinitionOscillatorissimplystatedafrequencysource,usuallyinaphaselockloop.Detailedsaidisthatadevicedon'tneedthesignaltotheirownmotivation,DcpowercanbetransformedintoAcpower.Generallyfallintothepositivefeedbackandnegativeresistance.Theso-called"oscillating
5、",Itsmeaningistoalludetoexchange,.Oscillatorincludesaneveroscillationtoprocessandfunctionofoscillation.Cancompletionfromdctoacpowertransformation,Thisdevicecanbecalled"oscillator".OscillatorworkingprincipleLCcircuitconsistingofcapacitorsandinductors,electricfieldandtheconversionof
6、magneticenergyproductionprocessfreeoscillation.Tomaintaintheoscillationalsohasapositivefeedbackamplifiercircuit,theLCoscillatorisdividedintoatransformercoupledandthree-pointoscillator,manyapplicationsofquartzcrystalquartzcrystaloscillator,LCoscillatorwithanintegratedoperationalamp
7、lifier.Exactlythesamedevicecannotbeparametersinthestateofthepowerthemomentthetwotransistoroccursachange,thischangeduetoincreasinglystrongroleinthepositivefeedback,leadingtoreachatemporarysteadystate.Duringthetemporarysteadystatetoanothertransistorbycapacitancegradually13压控高频LC振荡器的
8、设计—————————————————————————————ch
