Bipolar Junction Transistors.ppt

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ECE340 ELECTRONICS IBIPOLAR JUNCTION TRANSISTOR

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BIPOLAR JUNCTION TRANSISTORTHREE TERMINAL DEVICE CONSISTS OF TWO PN JUNCTIONS CURRENT AMPLIFIER

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NPN BJT PHYSICAL STRUCTUREEBCn+n-pbaseemittercollector

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PNP BJT PHYSICAL STRUCTUREEBCnppbaseemittercollector

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TWO PN JUNCTION DEVICEP TYPEN TYPEP TYPEEMITTERBASECOLLECTOR

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ACTUAL SCALED DIMENSIONSPNP EMITTERBASECOLLECTOR

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MODES OF OPERATIONCUTOFF ACTIVE OR LINEAR SATURATION

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PNP CUTOFF MODE OF OPERATION- VEB ++ VBC -REVERSE-BIASEDREVERSE-BIASEDEMITTERCOLLECTORBASEIE=0IC=0IB=0

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PNP ACTIVE MODE OF OPERATION+ VEB - + VBC -FORWARD-BIASEDREVERSE-BIASEDEMITTERCOLLECTORBASEIEICIB

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PNP SATURATION MODE OF OPERATION+ VEB - - VBC +FORWARD-BIASEDFORWARD-BIASEDEMITTERCOLLECTORBASEIEICIB0

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NPN CUTOFF MODE OF OPERATION+ VBE -- VCB +REVERSE-BIASEDREVERSE-BIASEDEMITTERCOLLECTORBASEIE=0IC=0IB=0

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NPN ACTIVE MODE OF OPERATION- VBE + - VCB +FORWARD-BIASEDREVERSE-BIASEDEMITTERCOLLECTORBASEIEICIB

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NPN SATURATION MODE OF OPERATION- VBE + +VCB -FORWARD-BIASEDFORWARD-BIASEDEMITTERCOLLECTORBASEIEICIB0

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BJT CURRENTS

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CURRENT RATIOS

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COLLECTOR CURRENT CHARACTERISTICS

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BASE CURRENT CHARACTERISTICS

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EMITTER CURRENT CHARACTERISTICS

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BJT CURRENT SUMMARY

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LARGE SIGNAL MODELST MODEL HYBRID PI MODEL

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T MODELCBEVBE+-EBCVEB+-NPNPNPIBIBIEIE

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PNP HYBRID PI MODELIEIBICISCexp(VEB/VT)PNP

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NPN HYBRID PI MODELISCexp(VBE/VT)NPN

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BJT SYMBOLSNPNPNP

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COLLECTOR CURRENT CHARACTERISTICSiCvBEVBE

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COLLECTOR CURRENT CHARACTERISTICSiBiB=80AiB=60AiC {VCE=2V

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Last Updated: 8th March 2018

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