标签: 01610851

01610851526IEEETRANSACTIONSONCIRCUITSANDSYSTEMS―I:REGULARPAPERS,VOL.53,NO.3,MARCH2006ASpur-ReductionTechniquefora5-GHzFrequencySynthesizerChun-YiKuo,StudentMember,IEEE,Jung-YuChang,StudentMember,IEEE,andShen-IuanLiu,SeniorMember,IEEEAbstract―Aspur-reductiontechniqueispresentedtoachievelowreferencespursfora5-GHzfrequencysynthesizer.Adual-pathcontrolschemeincorporatedwithapairoftheproposedsmoothedvaractorsreducesthegainofvoltage-controlledoscillatortolessthan15MHz/V,attenuatesthespurioustones,andshortensthesimulatedsettlingtimeby56%.In,addition,adigitalfrequency-calibrationcircuitisusedtoenlargethetuningrangetoovercomeprocessvariations.A5-GHzfrequencysynthesizerhasbeenfabricatedforve……