lecture18annotat

lecture18annotat - 6.012- MicroelectronicDevicesandCircuits-

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture18-1Lecture18- TheBipolarJunctionTransistor(II)RegimesofOperationNovember10,2005Contents:1.Regimesofoperation.2.Large-signalequivalentcircuitmodel.3.Outputcharacteristics.Readingassignment:HoweandSodini,Ch.7,7.3,7.4Announcements:Quiz2:11/16,7:30-9:30PM,openbook,mustbringcalculator;lectures#10-18.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture18-2KeyquestionsWhatotherregimesofoperationaretherefortheBJT?Whatisuniqueabouteachregime?HowdoequivalentcircuitmodelsfortheBJTlooklike?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture18-31.RegimesofoperationVBE C -+ VBC forward saturation active + B VCE + VBC VBE reverse --cut-off E forwardactive:devicehasgoodisolationandhighgain;mostusefulregime;saturation:devicehasnoisolationandisoodedwithminoritycarrierstakestimetogetoutofsatura-tion;avoidreverse:poorgain;notuseful;cut-off:negligiblecurrent:nearlyanopencircuit;useful.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture18-42Forward-activeregime:VBE>0,VBC<n-Emitter p-Base n-Collector IE<0 IB>0 IC>0 VBE> 0 VBC< 0 Minoritycarrierprofiles(nottoscale):emitter base collector npBpnE pnC npBopnEo pnCo x -WE-XBE -XBE 0 WB WB+XBC WB+XBC+WC 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture18-5Emitterinjectselectronsintobase,collectorcollectselectronsfrombase:qVBEIC=ISexpkTBaseinjectsholesintoemitter,recombineatemittercontact:ISqVBEIB=(exp1)FkTEmittercurrent:qVBEISqVBEIE=ICIB=ISexp(exp1)kTFkTState-of-the-artICBJTstoday:IC.11mA,F50300....
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lecture18annotat - 6.012- MicroelectronicDevicesandCircuits-

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