标签: fmusa

fmusa_pllnoiseNoiseAnalysisofPhaseLockedLoopsandSystemTrade-offsFaisalA.MusaABSTRACTThisreportanalyzesphaselockedloopsfromthenoisepointofviewanddiscussesthedifferenttrade-offsindesigninglownoisePLLs.Beginningwitharstorderloop,theimportanceofloopbandwidthisexplained.ItisshownthattheloopbandwidthbasicallyactsasathresholdwhentheVCOnoisebeginstodominateovertheinputnoise.HigherorderloopsarealsoanalyzedtoshowthattwobasicPLLparameters:thechargepumpgainandtheresistanceintheloopltercanbevariedforreducingthenoiselevelattheoutput.However,variationoftheseparametersdisturbstabilityandfrequencyspectrumofthePLL.Trade-offsinvaryingtheseparametersarediscussedandastepbystepPLLdesignprocedure……