标签: multi-gigahertz

Phasenoiseinmulti-gigahertzCMOSringoscillatorsPhaseNoiseinMulti-GigahertzCMOSRingOscillatorsAliHajimiri,SotiriosLimotyrakis,ThomasH.LeeCenterforIntegratedSystems,Stanford,CA94305-4070AbstractAnanalysisofthephasenoiseindifferentialandsingleendedringoscillatorsusingatime-variantmodelispresented.AnexpressionfortheRMSvalueoftheimpulsesensitivityfunction(ISF)isderived.Aclosed-formequationforphasenoiseofringoscillatorsiscalculatedandalowerlimitonthephasenoiseofringoscillatorsisshown.Phasenoisemeasurementsofoscillatorsrunningupto5.5GHzareingoodagreementwiththetheory.IntroductionDuetotheirintegratednature,ringoscillatorshaverecentlybecomeanimportantbuildingblockinmanydigitalandcommunicationsystems[13.Theycanalsobeusedfor……