超大CMOS集成电路原理课件.ppt

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1、DigitalIntegratedCircuitsADesignPerspectiveTheDevicesJanM.RabaeyAnanthaChandrakasanBorivojeNikolicGoalofthischapterPresentintuitiveunderstandingofdeviceoperationIntroductionofbasicdeviceequationsIntroductionofmodelsformanualanalysisIntroductionofmodelsforSPICEsi

2、mulationAnalysisofsecondaryanddeep-sub-microneffectsFuturetrendsTheDiodenppnBASiO2AlABAlABCross-sectionofpn-junctioninanICprocessOne-dimensionalrepresentationdiodesymbolMostlyoccurringasparasiticelementinDigitalICsDepletionRegionDiodeCurrentForwardBiasTypicallya

3、voidedinDigitalICsReverseBiasTheDominantOperationModeModelsforManualAnalysisJunctionCapacitanceDiffusionCapacitanceSecondaryEffects–25.0–15.0–5.05.0VD(V)–0.1ID(A)0.100AvalancheBreakdownDiodeModelSPICEParametersWhatisaTransistor?ASwitch!

4、VGS

5、AnMOSTransistorTheMOS

6、TransistorPolysiliconAluminumMOSTransistors-TypesandSymbolsDSGDSGGSDDSGNMOSEnhancementNMOSPMOSDepletionEnhancementBNMOSwithBulkContactThresholdVoltage:ConceptTheThresholdVoltageTheBodyEffectCurrent-VoltageRelationsAgoodol’transistorQuadraticRelationship00.511.

7、522.50123456x10-4VDS(V)ID(A)VGS=2.5VVGS=2.0VVGS=1.5VVGS=1.0VResistiveSaturationVDS=VGS-VTTransistorinLinearTransistorinSaturationPinch-offCurrent-VoltageRelationsLong-ChannelDeviceAmodelformanualanalysisCurrent-VoltageRelationsTheDeep-SubmicronEraLinearRelatio

8、nship-4VDS(V)00.511.522.500.511.522.5x10ID(A)VGS=2.5VVGS=2.0VVGS=1.5VVGS=1.0VEarlySaturationVelocitySaturationx(V/µm)xc=1.5un(m/s)usat=105Constantmobility(slope=µ)ConstantvelocityPerspectiveIDLong-channeldeviceShort-channeldeviceVDSVDSATVGS-VTVGS=VDDIDversusVGS0

9、0.511.522.50123456x10-4VGS(V)ID(A)00.511.522.500.511.522.5x10-4VGS(V)ID(A)quadraticquadraticlinearLongChannelShortChannelIDversusVDS-4VDS(V)00.511.522.500.511.522.5x10ID(A)VGS=2.5VVGS=2.0VVGS=1.5VVGS=1.0V00.511.522.50123456x10-4VDS(V)ID(A)VGS=2.5VVGS=2.0VVGS=1.5

10、VVGS=1.0VResistiveSaturationVDS=VGS-VTLongChannelShortChannelAunifiedmodelformanualanalysisSDGBSimpleModelversusSPICE00.511.522.500.511.522.5x10-4VDS(V)ID(A)Velocity