A 1.4 GHz differential low-noise CMOS frequency synthesizer using a wideband PLL architecture 英文文献资料

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1、TP12.5A1.4GHzDifferentialLow-NoiseCMOSFrequencySynthesizerusingaWidebandPLLArchitectureLiLin,LunsTee,PaulR.GrayUniv.ofCalifornia,Berkeley,CA.Thegrowingimportanceofwirelessmediaforvoiceanddataconnectedasshownwithdifferentialcontrols.Capacitancechangescomm

2、unicationsisdrivinganeedforhigherintegrationinpersonalofD1andD2duetocommon-modecontrolvoltageperturbationsarecommunicationstransceiverstoachievelowercost,smallerformfirst-ordercompensatedbyoppositechangesofD3andD4.Thefactor,andlowerpowerdissipation[1].On

3、eapproachtothisoscillationfrequencytothefirstorderdependsonlyonthedifferen-problemistointegratetheRFfunctionalityinlow-costCMOStialcontrolsratherthanthecommon-modecontrolvoltage.technologytogetherwiththebasebandtransceiverfunctions.Thisinturnrequiresinte

4、grationofthefrequencysynthesizerwithSpurioustonesresultingfromthefrequencycomparisonprocessdoenoughisolationfromsupplynoisetoallowittocoexistwithothernotgetmuchattenuationbytheloopfilterbecauseofthewideloopon-chiptransceivercircuitryandstillmeetthephasen

5、oiseperfor-bandwidth.Matchingofthecurrentsourcesinthechargepumpismancerequirementsoftheapplication.Thisdifferentialsynthe-criticalinminimizingthesetones.Figure12.5.2showsthecircuitsizerforblock-down-convertreceiversachievesimprovedlevelsofdiagramofthedif

6、ferentialchargepumpwithactiveloopfilter.FullphasenoiseandsupplyrejectionperformancethroughtheuseofswingUPandDNsignalsfromthephase/frequencydetector(PFD)fully-differentialarchitectureandawide-bandwidthPLL.outputareusedtocompletelyturnofftheswitchestominim

7、izetheleakagecurrentandhencemismatchoftheleakagecurrent.AnInconventionaldouble-conversionreceivers,theRFsynthesizeractiveloopfilterisusedsothatthesteady-statechargepumputilizesalow-phase-noiseVCOcoupledtoareferenceoscillatorbydifferentialoutputisalwaysze

8、roevenwhenalargecontrolvoltagealowbandwidthsynthesizerloop.ThelowbandwidthisdesirableisrequiredtodrivetheVCO.Acommon-modefeedback(CMFB)tominimizespurioustonesintheoutputfrequencyspectrumthatcircuitsetsthechargepumpoutputco