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ID:33704334
大小:3.89 MB
页数:40页
时间:2019-02-28
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1、CHAPTER1SignalIntegrityIsinYourFuture“Therearetwokindsofdesigners,thosewithsignal-integrityproblemsandthosethatwillhavethem.”onawhiteboardatalargesystemscompanyIronically,thisisanerawhennotonlyareclockfrequenciesincreasingandsignalintegrityproblemsgettingmoresevere,b
2、utthetimedesignteamshaveavailabletosolvetheseproblemsanddesignnewproductsisgettingshorter.Prod-uctdesignteamshaveonechancetogetaproducttomarket;theproductmustworksuccessfullythefirsttime.Ifidentifyingandeliminatingsignalintegrityproblemsisn’tanactivepriorityasearlyint
3、heproductdesigncycleaspossible,chancesaretheproductwillnotwork.TIPAsclockfrequenciesincrease,identifyingandsolvingsignal-integrityproblemsbecomescritical.Thesuccessfulcom-panieswillbethosethatmastersignal-integrityproblemsandimplementanefficientdesignprocesstoeliminat
4、etheseprob-lems.Itisbyincorporatingnewdesignrules,newtechnologies,andnewanalysistoolsthathigherperformancedesignscanbeimplementedandmeetever-shrinkingschedules.Inhigh-speedproducts,thephysicalandmechanicaldesigncanaffectsignalintegrity.Anexampleofhowasimpletwo-inch-l
5、ongsectionoftraceonaprinted12Chapter1•SignalIntegrityIsinYourFutureFigure1-1100-MHzclockwaveformfromadriverchip,whenthereisnoconnection(smoothplot)andwhenthereisatwo-inchlengthofPCBtraceconnectedtotheoutput(ringing).Scaleis1v/divand2nsec/div,simulatedwtihMentorGraphi
6、csHyperlynx.circuitboard(PCB)canaffectthesignalintegrityfromatypicaldriverisshowninFigure1-1.Thedesignprocessisoftenaveryintuitiveandcreativeprocess.Feedingyourengineeringintuitionaboutsignalintegrityiscriticallyimportanttoreachinganacceptabledesignasquicklyaspossibl
7、e.Allengineerswhotouchtheproductshouldhaveanunderstandingofhowtheyinfluencetheperformanceoftheover-allproduct.Byunderstandingthefundamentalprinciplesofsignalintegrityatanintuitiveandengineeringlevel,everyengineerinvolvedinthedesignprocesscanseetheimpactoftheirdecision
8、sonsystemperformance.Thisbookisaboutthefundamentalprinciplesneededtounderstandsignal-integrityproblemsandtheirsolutions.Theengineer
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