CMOS大规模集成电路.ppt

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1、IntroductiontoCMOSVLSIDesignLecture4:DC&TransientResponse14:DCandTransientResponseOutlineDCResponseLogicLevelsandNoiseMarginsTransientResponseDelayEstimation24:DCandTransientResponseActivity1)Ifthewidthofatransistorincreases,thecurrentwillincreasedecreasenotchange2)Ifthelengtho

2、fatransistorincreases,thecurrentwillincreasedecreasenotchange3)Ifthesupplyvoltageofachipincreases,themaximumtransistorcurrentwillincreasedecreasenotchange4)Ifthewidthofatransistorincreases,itsgatecapacitancewillincreasedecreasenotchange5)Ifthelengthofatransistorincreases,itsgateca

3、pacitancewillincreasedecreasenotchange6)Ifthesupplyvoltageofachipincreases,thegatecapacitanceofeachtransistorwillincreasedecreasenotchange34:DCandTransientResponseActivity1)Ifthewidthofatransistorincreases,thecurrentwillincreasedecreasenotchange2)Ifthelengthofatransistorincreases,

4、thecurrentwillincreasedecreasenotchange3)Ifthesupplyvoltageofachipincreases,themaximumtransistorcurrentwillincreasedecreasenotchange4)Ifthewidthofatransistorincreases,itsgatecapacitancewillincreasedecreasenotchange5)Ifthelengthofatransistorincreases,itsgatecapacitancewillincreased

5、ecreasenotchange6)Ifthesupplyvoltageofachipincreases,thegatecapacitanceofeachtransistorwillincreasedecreasenotchange44:DCandTransientResponseDCResponseDCResponse:Voutvs.VinforagateEx:InverterWhenVin=0->Vout=VDDWhenVin=VDD->Vout=0Inbetween,VoutdependsontransistorsizeandcurrentByKCL

6、,mustsettlesuchthatIdsn=

7、Idsp

8、WecouldsolveequationsButgraphicalsolutiongivesmoreinsight54:DCandTransientResponseTransistorOperationCurrentdependsonregionoftransistorbehaviorForwhatVinandVoutarenMOSandpMOSinCutoff?Linear?Saturation?64:DCandTransientResponsenMOSOperationCutoffLinear

9、SaturatedVgsnVdsnVdsn>74:DCandTransientResponsenMOSOperationCutoffLinearSaturatedVgsnVtnVdsnVtnVdsn>Vgsn–Vtn84:DCandTransientResponsenMOSOperationCutoffLinearSaturatedVgsnVtnVdsnVtnVdsn>Vgsn–VtnVgsn=VinVdsn=Vout94:DCandTran

10、sientResponsenMOSOperationCutoffL