lecture19annotat

lecture19annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-1Lecture19- TransistorAmplifiers(I)Common-SourceAmplifierNovember15,2005Contents:1.Amplifierfundamentals2.Common-sourceamplifier3.Common-sourceamplifierwithcurrent-sourcesupplyReadingassignment:HoweandSodini,Ch.8,§§8.1-8.6Announcements:Quiz2:11/16,7:30-9:30PM,openbook,mustbringcalculator;lectures#10-18.Quiz2TAReviewSession:11/15,7:30-9:30PM,6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-2Keyquestions•Whatarethekeyfiguresofmeritofanamplifier?•HowcanonemakeavoltageamplifierwithasingleMOSFETandaresistor?•Howcanthisamplifierbeimproved?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-31.AmplifierfundamentalsGoalofamplifiers:signalamplification.+V -V vIN vOUT + + --vIN vOUT input signal output signal RL Featuresofamplifier:•Outputsignalisfaithfulreplicaofinputsignalbutamplifiedinmagnitude.•Activedeviceisattheheartofamplifier.•Needlineartransfercharacteristicsfordistortionnottobeintroduced.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-4Signalcouldberepresentedbycurrentorvoltage⇒fourbroadtypesofamplifiers:vs + − RS RL vout RL RS vs + − iout + − voltage amplifier transconductance amplifier + − voutRLRS is transresistance amplifier RLRS is iout current amplifier 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-5Morerealistictransfercharacteristics:vIN vOUT input signal output signal Q •Transfercharacteristicslinearoverlimitedrangeofvoltages:amplifiersaturation.•Amplifiersaturationlimitssignalswing.•Signalswingalsodependsonchoiceofbiaspoint,Q(alsocalledquiescentpointoroperatingpoint).Otherfeaturesdesiredinamplifiers:•Lowpowerconsumption.•Widefrequencyresponse[willdiscussinafewdays].•Robusttoprocessandtemperaturevariations.•Inexpensive:mustminimizeuseofunusualcompo-nents,mustbesmall(inSiarea)6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture19-62.Common-SourceAmplifierConsiderthefollowingcircuit:V+ =VDD vs VGG vOUT iR iD RD RS signal source + -signal load RL -V =VSS Consideritfirstunloadedby...
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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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lecture19annotat - 6.012- MicroelectronicDevicesandCircuits-

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