lecture17annotat

lecture17annotat - 6.012 Fall2005Lecture17-1Lecture17

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Unformatted text preview: 6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture17-1Lecture17- TheBipolarJunctionTransistor(I)ForwardActiveRegimeNovember8,2005Contents:1.BJT:structureandbasicoperation2.I-VcharacteristicsinforwardactiveregimeReadingassignment:HoweandSodini,Ch.7,§§7.1,7.2Announcements:Quiz2:11/16,7:30-9:30PM,openbook,mustbringcalculator;lectures#10-18.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture17-2Keyquestions•Whatdoesabipolarjunctiontransistorlooklike?•Howdoesabipolarjunctiontransistoroperate?•WhataretheleadingdependenciesoftheterminalcurrentsofaBJTintheforwardactiveregime?6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture17-31.BJT:structureandbasicoperationbase emitter base collector contact contact contact contact n+emitter p base n collector n+buried layer n+plug p substrate "intrinsic" BJT base-collector junction base-emitter junction (area AE) collector-substrate junction emitter-stripe length emitter-stripe width UniquenessofBJT:high-currentdrivabilityperinputca-pacitance⇒fast⇒excellentforanalogandfront-endcommunicationsapplications.6.012- MicroelectronicDevicesandCircuits- Fall2005Lecture17-4Simplifiedone-dimensionalmodelofintrinsicdevice:Emitter Base Collector -IE IB IC n p n NaBNdE VBE VBC NdC + + -x -WE-XBE -XBE 0 WB WB+XBC WB+XBC+WC BJT=twoneighbouringpnjunctionsback-to-back:•closeenoughforminoritycarrierstointeract(candiffusequicklythroughbase)•farapartenoughfordepletionregionsnottointeract(prevent”punchthrough”)Regimesofoperation:collectorVBE IC -+ VBC forward saturation...
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lecture17annotat - 6.012 Fall2005Lecture17-1Lecture17

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