SIMULATION AND EXPERIMENTAL STUDY OF CHAOS GENERATION IN MICROWAVE BAND USING COLPITTS CIRCUIT-中国期刊网

摘要 ChaoticColpittscircuitswithfundamentalfrequencyf*beyond1GHzarestudiedbybothcircuitsimulationandexperimentusingPhilips'broadbandtransistorwiththresholdfrequencyof25GHz.ForthebasicconfigurationofColpittscircuitwithf*ofabout1.6GHz,broadbandcontinuouspowerspectracouldbeobtainedfrombothcircuitsimulationsandexperiments.TheharmonicsoftheobservedsignalfromAgilentPSA/ESAspectrumanalyzerareasnoticeableasfaras12GHz.AmodifiedColpittscircuitstructureemployingtheparasiticinductanceofBJT(BipolarJunctionTransistor)isalsoproposedandinvestigated.Bycircuitsimulation,chaoticattractorandbroadbandcontinuouspowerspectracouldbeobtainedfromthemodifiedColpittscircuitwithf*ofabout3.5GHz.Becausetheparasiticeffectsoftheprototypeboard,theexperimentresultofthemodifiedColpittscircuitdoesnotagreewellwiththesimulationresult.Thegapbetweenthesimulationandexperimentalresultcouldbebridgedbyreplacingthelumpedcircuitelementswithdistributedones.

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SIMULATION AND EXPERIMENTAL STUDY OF CHAOS GENERATION IN MICROWAVE BAND USING COLPITTS CIRCUIT

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SIMULATION AND EXPERIMENTAL STUDY OF CHAOS GENERATION IN MICROWAVE BAND USING COLPITTS CIRCUIT

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