lecture22annotat

lecture22annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-1Lecture22- MultistageAmplifiers(II)DCVoltageandCurrentSourcesNovember29,2005Contents:1.DCvoltagesources2.DCcurrentsourcesandsinksReadingassignment:HoweandSodini,Ch.9,9.46.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-2KeyquestionsHowdoesonesynthesizevoltageandcurrentsources?Howcanthisbedoneinaneconomicway?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-31.DCvoltagesources2Featuresofvoltagesource:Awellcontrolledvoltagevoltagedoesnotdependoncurrentdrawnfromsource(lowinternalresistance).I-Vcharacteristicsofvoltagesource:I ideal real 0 0 VSV Equivalentcircuitmodelofvoltagesource:RS Vs + -6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-42ConsiderMOSFETindiodeconfiguration:ID ID VGS=VT VGS ++VDS VGS 0 0 VT VDS I-Vcharacteristics:WID=Cox(VGSVT)2=WCox(VDSVT)22L2LBeyondthreshold,MOSFETlookslikediodewithquadraticI-Vcharacteristics.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-52Howdoesonesynthesizeavoltagesourcewiththis?Assumeacurrentsourceisavailable.iiOUT VDD iD IREF + vOUT vOUT OUT -IREF VT 0 VGS=VDStakesvalueneededtosinkcurrent:WID=IREF+iOUT=Cox(vOUTVT)22LThen:WiOUT=Cox(vOUTVT)2IREF2LSolvingforvOUT:IREF+iOUTvOUT=VT+W2LCox6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-6vOUTisfunctionofIREFandW/LofMOSFET:IREF vOUTW/L vOUTW/L VTVT vOUTvOUT iOUTiOUT IREF IREF IREF1 IREF2 2Small-signalviewofvoltagesource:+ + --vgs vt it gmvgsro D G S 11Rout=//rogmgmRoutissmall(good!).6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture22-72PMOSvoltagesource:...
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lecture22annotat - 6.012- MicroelectronicDevicesandCircuits-

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