IBIS建模和PCB信号完整性分析

2710201010MICROELECTRONICS&COMPUTERVol.27No.10October2010:2009-08-14;:2009-10-18IBISPCB周博远,于立新,褚军舰(,100076):随着数字系统中时钟频率的提高,PCB上的信号完整性也日益成为设计过程中不可忽略的问题.文中通过阐述IBIS模型的建立和PCB板上信号完整性的分析,介绍了一种必要的基于IBIS模型建立的信号完整性仿真及分析方法,例举了时钟网络设计的反射仿真结果对比.:PCB;信号完整性;行为级模型;IBIS建模:TN4:A:1000-7180(2010)10-0111-03MethodofIBISModelingandPCBSignalIntegrityAnalysisZHOUBoyuan,YULixin,CHUJunjian(BeijingMicroctronicTechnologyInstitute,Beijing100076,China)Abstract:Astheclockrateofdigitalsystemincreases,thePCBsignalintegrity(SI)problembecomesunignorable.BytakingadvantageofIBISmodelandanalyzingtheSIissuesonPCB,anecessarySIanalysisandsimulationmethodbasedontheIBISmodelingispresentedinthispaper.Finallythereflectionsimulationresultsofthemethodonaclocknetareintroducedasanexample.Keywords:PCB;SignalIntegrity(SI);behaviormodel;I/OBufferInformationSpecification(IBIS)modeling1IC,,PCB.,(SI)[1].,SIIBIS.,CPU,CPUIBIS,.2IBISIBISIntelPCB.IBISI/O,,.,IBISSPICE20,.,IBISPCB,1999(EIA/ANSI656-A)[2].IBIS(1),Pullup,Pulldown,PowerClamp,GNDClamp,CcompRpkf,Cpkg,Lpkg.1IBIS,,.2.2IBISIBIS.,IV,0,.,IV,1,.IBIS.IBISVoltage-Time(VT).,,VTrisingwaveform001.VT,fallingwaveform010.,IBISVTVT.IBIS,VT,VT,RAMP.,.3IBISIBIS,.IBIS,SPICE,IBIS[35],,SPICE.IBIS,,IBIS.CPU,SPICEIBIS,3.,SPICE,4,.4Pullup3SPICEIBISIBISV-I,,,,-VCC2VCC.Pullup,,,OENDisable.PullupV-I.LIS..LIS,IBIS.Pulldown.risingwaveformfallingwaveform.4IBIS,,,.,[6].,,5.5,65MHz1122010133MHz,,R10,67.665MHz7133MHz,,,4.28V,3.3V1V,..,:=Z2-Z1Z2+Z1,Z1,Z2.,.,,R130~50,378.8,37,4.476V990.855mV,9.,.9133MHz5CPUIBIS,,PCB,SIPCB.:[1]EricBogatin.Signalintegrity:simplified[M].NewJersey:PearsonEducationPrenticeHall,2005.[2]EIAStandard.ANSI/EIA-656-A-1999,I/Obufferinformationspecification(IBIS)version3.2[S].TheIBISOpenForum,1999.[3]TimCoyle.Anengineer!sguidetohackingIBISmodels[EB/OL].[2009-08-21].SignalConsultingGroup.[4]AmbrishKantVarma.Improvedbehavioralmodelingbasedontheinputoutputbufferinformationspecification[D].NorthCarolina:NorthCarolinaStateUniversity,2007.[5].IBIS[J].,2008,25(6):82-85.[6],.Cadence[M].2.:,2007.:,(1984-),..,(1967-),.SOC.,(1980-),.SOC.11310,:IBISPCB