抖动(Jitter)简介

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1、IntroductiontoJitterIntroductiontoJitterCraigEmmerichProductMarketingEngineerWavecrestOctober23WavecrestIntroductiontoJitterIntroductiontoJitterAbriefintroductiontojitter,it’seffectonCommunicationandClocksignalsWavecrestForeshadowingForeshadowingnWhatisJitter?nJitterMeasurementTechniquesnMeasuringsi

2、mplejitternMeasuringRandomJitter(RJ)andDeterministicJitter(DJ)nMeasuringPeriodicJitter(Modulation)nMeasuringAdjacentCycleJitter(Rambus®&Intel®)nMeasuringRJ&DJonDataSignals.nTheSIA3000nWrap-upQ&A…WavecrestIntrotoJitterTestingIntrotoJitterTestingnWhytestforJitter?nDeviceSpeedsareexceeding1GHz®Setuptim

3、ebudgetsgettingtightertherebyreducingtotaljitterbudgetnStudiesshowaclearlinkbetweenjitterandoveralldeviceperformanceandBER®ForSerialCommunicationsDeviceManufacturers,JitterTestingisfasterandmoreconclusivethanproductionbiterrorratetesting®FibreChannelspecificationscallfor14sreliability.Thiswouldtakeo

4、ver15minutestotestusingaBERTwhilelessthan1secondusingjittertechniques.nJitteristhefinalfrontierforhighspeedlogic®Today’ssimulationsoftwarevirtuallyguaranteesfunctionalitybutcannotaccuratelyestimatejitterperformance®Oncefunctionalityhasbeenestablished,overallperformanceoptimizationisthenextstepnJitte

5、rcanidentifyprocessvariations.®Certainjittercomponentsaresensitivetoimpurities,thermalvariationsandcrosstalk(crosstalkmayindicatepoorsignalseparation.)nBottomline…Jitterperformanceofacircuittranslatestooverallsystemperformance.WavecrestWhatisJitter?WhatisJitter?nJitter-“Thedeviationfromtheidealtimin

6、gofanevent.…JitteriscomposedofbothdeterministicandGaussian(random)content.”T11.2/Project1230/Rev10FibreChannel-MethodologiesforJitterSpecificationpage7.ReferencePointHistogramWavecrestWhatisJitterMadeof?WhatisJitterMadeof?Whydoesitoccur?Howwilliteffectmycircuit?WavecrestWhatisJitterComposedof?Whatis

7、JitterComposedof?nDeterministicJitter(DJ)“Jitterwithnon-Gaussianprobabilitydensityfunction.Deterministicjitterisalwaysboundedinamplitudeandhasspecificcauses.Fourkindsofdeterministicjitterareidentified