lecture11annotat

lecture11annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture11-1Lecture11- MOSFET(III)MOSFETEquivalentCircuitModelsOctober18,2005Contents:1.Low-frequencysmall-signalequivalentcircuitmodel2.High-frequencysmall-signalequivalentcircuitmodelReadingassignment:HoweandSodini,Ch.4,4.5-4.66.012- MicroelectronicDevicesandCircuits- Fall2005Lecture11-2KeyquestionsWhatisthetopologyofasmall-signalequivalentcir-cuitmodeloftheMOSFET?Whatarethekeydependenciesoftheleadingmodelelementsinsaturation?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture11-31.Low-frequencysmall-signalequivalentcir-cuitmodelRegimesofoperationofMOSFET:VGS VBS VDS ID VDS ID VGS VGS=VT VDSsat=VGS-VT 0 0 linear saturation cutoff Cut-off:ID= 0Linear:WVDSID=nCox(VGSVT)VDSL2Saturation:WID=IDsat=nCox(VGSVT)2[1+(VDSVDSsat)]2LEffectofbackbias:VT(VBS) =VT o+(2pVBS 2p)6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture11-4Small-signaldevicemodelingInmanyapplications,interestedinresponseofdevicetoasmall-signalappliedontopofbias:VGS VBS VDS ID+id vgs vbs vds + -++ --Keypoints:Small-signalissmallresponseofnon-linearcomponentsbecomeslinearCanseparateresponseofMOSFETtobiasandsmallsignal.Sinceresponseislinear,superpositioncanbeusedeffectsofdifferentsmallsignalsareindependentfromeachother6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture11-5MOSFET small-signal VGS VBS VDS ID+id vgs vbs vds + -++ --VGS VBS VDS ID id vgs vbs vds + -++ --circuit model = + equivalent Mathematically:iD(VGS+vgs, VDS+vds, VBS+vbs)IDIDIDID(VGS, VDS, VBS)+Qvgs+VDSQvds+...
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lecture11annotat - 6.012- MicroelectronicDevicesandCircuits-

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