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1、FastEye-DiagramAnalysis吳瑞北,Ruey-BeeiWuRm.340,DepartmentofElectricalEngineeringE-mail:rbwu@ew.ee.ntu.edu.twurl:http://cc.ee.ntu.edu.tw/~rbwuS.H.Hall&H.L.Heck,High-SpeedDigitalDesigns,ch.13.Contents•Introduction•PeakDistortionAnalysis•DiffusioninRCLine•FastLossyLineCharacterizat
2、ion•ArbitraryTx-LineSystemsR.B.Wu1MarginCalculationIdealsamplingpositionTimingskewJitterVoltageNoiseandrequiredcomparatorinputVoltageoffsetIdealreferencepointR.B.WuJune7,2010PeakDistortionAnalysisMarginCalculation(zoomed)IdealsamplingpositionTimingskewJitterVoltageNoiseandrequ
3、iredcomparatorVoltagemargininputVoltageoffsetIdealsamplingpositionTimemarginR.B.WuJune7,2010PeakDistortionAnalysis2Worst-caseeyecalculation•Eyediagramsaregenerallycalculatedempirically–Convolverandomdatawithpulseresponseofchannel–Pulseresponseisderivedbyconvolvingtheimpulserep
4、onsewiththetransmittedsymbol•Foreyediagramstorepresenttheworst-case,alargesetofrandomdatamustbeused–Lowprobabilityofhittingworstcasedatatransitions–Computationallyinefficient•Ananalyticalmethodofproducingtheworst-caseeyediagramexists–ComputationallyefficientalgorithmR.B.WuJune
5、7,2010PeakDistortionAnalysisPeakDistortionAnalysisRef.:J.G.Proakis,DigitalCommunications,3rded.,Singapore:McGraw-Hill,1995,pp.602-603(notmuchdetailedinfohere)June7,2010PeakDistortionAnalysis3InterconnectModel•Pointtopointdifferentialdesktoptopology•Differential,edge-coupledmic
6、rostrip(10”@55Ω)•2Sockets•2Packages(2”@45Ω)•1pFpadcapacitance•50Ωsingle-endedterminationpkgsocket10”µstripsocketpkgR.B.WuJune7,2010PeakDistortionAnalysisDifferentialSParametersR.B.WuJune7,2010PeakDistortionAnalysis4Eyediagram(100bits@5Gb/s)Randomdataeye(100bits)---Randomdataey
7、e(1000bits)---R.B.WuJune7,2010PeakDistortionAnalysisSamplepulseresponseISI+ISI-precursorcursorpostcursorR.B.Wu5StepresponseV+=cursor+∑ISIV−=0000011111111111R.B.WuWorst-case00110100100000VWC0=∑ISI+R.B.Wu6Worst-case10101100000VWC1=cursorR.B.Wu+∑ISI−Worst-casePatternsWorst-case0→
8、1101001Worst-case1→0010110R.B.Wu7Summary•GivenSParametersandt
