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【文件名】:061031@52RD_无线手机及CATV基顶的VCO设计.pdf 【格 式】:pdf 【大 小】:248K 【简 介】: 【目 录】:VoltageControlledOscillators(VCOs)havecometothe forefrontofRFdesignstogetherwiththefirstPLLcircuits. IntheerabeforethePLL,oscillatorsweremostlyfree runningandonlyinrarecaseswerevaractorsusedfor modulationortemperaturecompensation.Nowadays,we rarelyseefreerunningoscillators,insteadtheyhave becomevaractorcontrolledoscillators.Thisisbecause mostRFapplicationsrequirebandcoverage,whichcan berealizedthroughthePLLcircuitrequiringtwosources ofRFpower.Thereferencesourcefrequencyisoftena VCXOorTCXO,whiletheotherfrequencyiscontrolled bythePLLphasedetector. |
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发表于 2006-10-31 20:54:22
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