lecture21annotat

lecture21annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-1Lecture21- MultistageAmplifiers(I)MultistageAmplifiersNovember22,2005Contents:1.Introduction2.CMOSmultistagevoltageamplifier3.BiCMOSmultistagevoltageamplifier4.BiCMOScurrentbuffer5.CouplingamplifierstagesReadingassignment:HoweandSodini,Ch.9,9.1-9.36.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-2KeyquestionsHowcanonebuildawiderangeofhigh-performanceamplifiersusingthesingle-transistorstagesstudiedsofar?Whatarethemostimportantconsiderationswhenassemblingmulstistageamplifiers:regardinginterstageloading?regardinginterstagebiasing?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-31.IntroductionAmplifierrequirementsareoftendemanding:mustadapttospecifickindsofsignalsourceandload,mustdeliversucientgainSingle-transistoramplifierstagesareverylimitedinwhattheycanaccomplishmultistageamplifier.VDD vs VS RS VSS signal source vOUT RL + -signal load Issues:Whatamplifyingstagesshouldbeusedandinwhatorder?Whatdevicesshouldbeused,BJTorMOSFET?Howisbiasingtobedone?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-42Summaryofsinglestagecharacteristics:stageAvo, Gmo, AioCSGmo=gmCDAvogmgm+gmbCGAio1Rin1gm+gmbRoutkeyfunctionro//roctranscond.amp.1voltagebuffergm+gmbroc//[ro(1+gmRS)]currentbufferCEGmogmrCCAvo1r+(ro//roc//RL)CBAio11gmro//roctranscond.amp.1+RSvoltagebuffergmroc//{ro[1+gm(r//RS)]}currentbuffer2KeydifferencesbetweenBJTsandMOSFETs:BJTMOSFETIB=ICIG= 0gm=qICkT> gm=2WLCoxIDro=VAIC> ro=1ID6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-52.CMOSmultistagevoltageamplifier2Goals:highvoltagegainhighRinlowRout2Goodstartingpoint:CSstage+ -+ -vinvs RS + -vout-gm(ro//roc)vin ro//roc + -RL Rin=Avo=gm(ro//roc),probablyinsucientRout=ro//roc,toohigh6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture21-62AddsecondCSstagetogetmoregain:+ -+ -vin1vs RS + -vout1=vin2-gm1(ro1//roc1)vin1 ro1//roc1 + -+ -+ -vout2-gm2(ro2//roc2)vin2 ro2//roc2 RL Rin=Avo=gm1(ro1//roc1)gm2(ro2//roc2)butRout=ro2//roc2,stillhigh2AddCDstageatoutput:vs ro2 roc2 vin Avovin gm3 + gmb3RS CS CS CD + + vin3 vin3 + vout + + + 1 gm3 + gmb3 gm3 RL Rin=Avo...
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This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.012 taught by Professor Prof.jesúsdelalamo during the Fall '05 term at MIT.

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lecture21annotat - 6.012- MicroelectronicDevicesandCircuits-

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