模拟CMOS集成电路设计ppt课件.ppt

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1、BasicMOSDevicePhysics(Chapter1Chapter2)IntroductionBasicMOSDevicePhysicsIntroductionHighspeed、Highprecision、lowpowerdissipationADCHighperformanceamplifier、filterDistinguishbetweentheanaloganddigitalcircuitdesignTypicalVLSIcircuitstructureBasicMOSDevicePhysicsBasicconceptMOSI/VCharact

2、eristicsSecond-OrderEffectsMOSDeviceModelsBasicMOSDevicePhysicsBasicconceptMOSI/VCharacteristicsSecond-OrderEffectsMOSDeviceModelsBasicconceptMOSSwitchIdealswitchsymbolNMOSswitchsymbolBasicconceptMOSVoltageControlCurrentSourceIdealVCCSNMOSVCCSBasicconceptMOSstructureNMOSphysicalstruc

3、tureBasicconceptMOS’sstructureparameterNMOSL、LD、LEFF、tOXBasicconceptCMOSphysicalstructureCMOSphysicalstructureBasicMOSDevicePhysicsBasicconceptMOSI/VCharacteristicsSecond-OrderEffectsMOSDeviceModelsMOSI/VCharacteristicsThresholdVoltageDerivationofI/VCharacteristicsThresholdVoltageVGi

4、ncreasesfromzeroVG=0ThresholdVoltageVGincreasesfromzeroVG=0（Formationofdepletionregion）ThresholdVoltageVGincreasesfromzeroVG=0（onsetofinversionlayer）ThresholdVoltageNFETVTHDefinition：isusuallydefinedasthegatevoltageforwhichtheinterfaceisasmuchn-typeasthesubstrateisp-type.Thethreshold

5、voltageistypicallyadjustedbyimplantationofdopants.MOSI/VCharacteristicsThresholdVoltageDerivationofI/VCharacteristicsDerivationofI/VCharacteristicsAsimplebutcrucialequation：Qd：thechargedensityalongthedirectionofthecurrent,unitiscoulombspermeterC/m.v：thevelocityofthecharge.Derivationo

6、fI/VCharacteristicsChargedensityoftheinversionlayer：（equalsourceanddrainvoltages）DerivationofI/VCharacteristicsChargedensityoftheinversionlayer：（unequalsourceanddrainvoltages）DerivationofI/VCharacteristics，ismobilityofchargecarriers，Eiselectricfield，electronmobilityisDerivationofI/VC

7、haracteristicsTheintegrationofthechannelcurrent：DerivationofI/VCharacteristicsPeakcurrent：whereiscalled“overdrivevoltage”or“effectivevoltage”。IfVDSislowerthantheeffectivevoltage，thedevicewilloperatesin“trioderegion”.DerivationofI/VCharacteristicsTwobasicequation：ChannelcurrentID：when

8、Peakchannelc