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1、确保信号完整性的高速pcb电路板设计准则（DesigncriteriaforhighspeedPCBcircuitboardstoensuresignalintegrity）DOCdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.DesigncriteriaforhighspeedPCBcircuitboar
2、dstoensuresignalintegrity(2)Afterwiring,SIsimulation,ingeneral,SIdesignguidancerules,itisdifficulttoensurethataftertheactualwiringiscompleted,thereisnoSIortimingproblems.Evenifthedesigniscarriedoutundertheguidanceoftheguide,unlessyoucancontinuetoautoma
3、ticallycheckthedesign,otherwisethereisnoguaranteethatthedesignfullycomplywiththeguidelines,andthereforeinevitablyproblems.Afterthewiring,theSIsimulationcheckwillallowforaplannedbreak(orchange)designrule,butthisisonlynecessaryforcostconsiderationsortigh
4、twiringrequirements.Now,usingtheSIsimulationengine,itispossibletoemulatehigh-speeddigitalPCB(evenmultiboardsystems),automaticallyblocktheSIproblem,andgenerateaccuratepintopindelayparameters.Aslongastheinputsignalisgoodenough,thesimulationresultswillbee
5、quallygood.Thismakestheaccuracyofthedevicemodelandcircuitboardmanufacturingparametersakeyfactorindeterminingthesimulationresults.Manydesignengineerswillemulatethe"minimum"and"maximum"designcorners,andthenusetherelevantinformationtosolveproblemsandadjus
6、tproductivity.AfterthemanufacturingstageoftheabovemeasurescanensurethequalityoftheSIdesignofthecircuitboard,thecircuitboardassemblyiscompleted,itisstillnecessarytothecircuitboardonthetestplatform,usingoscilloscopeorTDR(timedomainreflectometry)measureme
7、nt,therealcircuitboardandthesimulationresultswerecomparedwiththeexpected.Thesemeasurementscanhelpyouimprovethemodelandmanufacturingparameterssothatyoucanmakebetter(lessconstrained)decisionsduringthenextpreliminarydesigneffort.Modelselectiononmodelselec
8、tionofmanyarticles,statictimingverificationengineersmayhavenoticed,althoughfromthedevicedatasheetcangetallthedatatobuildamodelisstillverydifficult.SIsimulationmodelistheopposite,butthemodeliseasytobuild,butthemodeldataisdifficulttoobtai
