Lec 12. Parasitic Extraction

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1、AdvancedVLSICircuitAnalysisLecture12:ParasiticExtractionGraduateCourseofFudanUniversityHengliangZhu,FangYang1Layoutparasitics•Wiresarenotideal.Parasitics:–Resistance–Capacitance–Inductance•Whydowecare?–Impactondelay–noise–energyconsumption–powerdistribution2Lay

2、outparasiticsInterconnectproblemsII:Simulation§Delayestimation§Signalintegrityproblem§CrosstalkidealDelaorySignalintegritycrosstalkInterconnectsdominatethecircuitperformanceFunct.SpecRTLBehav.Simul.LogicSynth.Stat.WireModelFront-endGate-levelNet.Gate-Lev.Sim.Fl

3、oorplanningBack-endParasiticExtrac.Place&RouteLayoutParasiticExtractionthousandsofwirese.g.criticalpathe.g.gnd/vddgridParasitic•identifysomeportsExtraction•produceequivalentcircuitthatmodelsresponseofwiresatthoseportstensofcircuitelementsforgatelevelspice5simul

4、ation6GGooalsalsofofPPaarrasasiitticicEExxttrracacttiion:on:FFrromom33DDGGeeomomeettrryytotoCiCirrccuuiittMMododelselsanalogIPintegratedigitalinductorsMEMsIPdigitalIPPackageorICCourtesyofHarrissemiconductorZ(f)Z(f)Z(f)••MMaiainnllyyffooccuussoonnppassassiivvece

5、coompmpoonneentsnts••EExxttrracacttffrreeququeenncycy--ddomomaaiinncicirrccuuiittmodmodelselsParasiticExtraction:ProblemDefinition•MaxwellEquationsaregoverningonesoveron-chipinterconnects!MMaaxxwwellellModelingofEquaEquattionsionsInterconnectÑ´E=-jHwmEquiEquivv

6、alaleennttÑ´H=+jweEJCCirirccuiuitstsÑ×=erEÑ×=mH0ICdesignisbasedontheJE=srelationofV(Voltage)andI(Current).BehaviorofinterconnectsisdescribedonE(Electric)andH(Magnetic).SynopsysCommercialTools8Outline•SetupsofParasiticExtractionProblems•Electromagneticsolvers•fa

7、stmatrix-vectorproducts•Conclusion9Outline•SetupsofParasiticExtractionProblems–CapacitanceExtraction(electrostatic)–RLExtraction(MQS)–CombinedRLCExtraction(EMQS)–ElectromagneticInterferenceAnalysis(fullwave)•Electromagneticsolvers•fastmatrix-vectorproducts•Conc

8、lusion10Capacitor11CapacitiveExtractionExample:Intel0.25micronProcessfringingparallelConsideronlyelectricfield(capacitive)coupling12CapacitanceExtractionWhydoweneedit?•Examp