《蒙特卡洛分析》PPT课件.ppt

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1、MonteCarlosimulation……forbetteryieldandperformance--AtutorialstartSystemrequirementStatisticalanalysisincludeprocess,mismatcheffectsInitialdesignDesignmeetsthegoal?endNOYESMonteCarlosimulation……forbetteryieldandperformanceSomedesignmaydegradeinperformanceOveralldes

2、ignyieldcouldbeunexpectedlylowIffabricationprocessparameteranddevicemismatcheffectonsamediearenottakenintoaccountthenHencestatisticalanalysismustfindahighplaceindesigncycleWewillperformMonteCarloanalysisonanRF-frontendLNAandcomparetheresultifnostatisticalanalysisi

3、sdone.WewillalsoseehowtoanalyzeyieldandscalardatainMonteCarlowiththehelpofLowpassfilterexample.MonteCarlosimulationMonteCarlosimulation(example)LinearityInputmatchingBiasN/WOutputmatchingCascodearch.toreducefeedbackcapacitanceRF-frontend(LNA)KnowingSystemrequiremen

4、tInitialdesignbasedonrequirementlikenoise,gain,narroworwideband.MonteCarlosimulationCadencesimulationsetup(Normal)Choosingaffirmaanalogartist2.ChoosingSpectresimulatorChoosingmodelfile,whichcontainsallMOS,reg.,capmodelparameters.MonteCarlosimulation1.Choosesetupmo

5、dellibraries2.BrowseandchoosemodelfileinthedirectoryCadencesimulationsetup(Normal)Setupanalysis(dc,ac,spetc.),createnetlistandrunsimulatorMonteCarlosimulation1.Chooseanalysistorun2.Chooseoutputtoplot3.CreatenetlistandrunCadencesimulationsetup(Normal)Plottingresults

6、MonteCarlosimulation1.Choosedirectplotforanalysis2.Clicktoviewthedesiredresult3.AnalyzewaveformCadencesimulationsetup(Normal)MonteCarlomodelinginCadencespectresimulatorProcessSection-describesmanufacturingparameter,theirstatisticalvariationandamodelfordevicethatcal

7、culatesits(width,length,cap,res.Etc.)accordingtoprocessparameter.Design-SpecificSection–designeraccordingtohisneedcanspecifyMonteCarloanalysis.Forexampleinacurrentmirrorcircuit,matchedtransistorsareusedanddesignercangivesomecorrelationfactorbetweenthesematchedtrans

8、istor.MonteCarlosimulationCadencesimulationsetup(MonteCarlo)TypicalModelFileProcessSectionAllparametersetstotheirnominalvalue,nostatisticalvariat