EE 330 Lect 20 Fall 2011

EE 330 Lect 20 Fall 2011 - EE 330 Lecture 20 Bipolar...

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EE 330 Lecture 20 Bipolar Processes Bipolar Devices BJT JFET Thyristors SCR TRIAC
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Simple dc model V BE or I B Typical Output Characteristics 0 50 100 150 200 250 300 0 1 2 3 4 5 Vds Id I C V CE Forward Active Saturation Cutoff Forward Active region of BJT is analogous to Saturation region of MOSFET Saturation region of BJT is analogous to Triode region of MOSFET Review from Last Lecture
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Simple BJT dc model Typical Output Characteristics Forward Active region of BJT is analogous to Saturation region of MOSFET Saturation region of BJT is analogous to Triode region of MOSFET I C V CE V BE or I B Saturation Forward Active Cutoff 0 0.5 1 1.5 2 2.5 3 0 1 2 3 4 5 VDS Cutoff Triode Saturation I D V DS V GS1 V GS2 V GS3 V GS4 Review from Last Lecture
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Simple dc model Simplified Multi-Region Model I C V CE V BE1 V BE2 V BE3 V BE4 V BE5 I C V CE V BE1 V BE2 V BE3 V BE4 V BE5 V CESAT Ebers-Moll Model Simplified Multi-Region Model 1 CE BE tt -V V VV CE R C S E R AF V 1+β I J A e e 1+ βV      AF CE V V E S C V V 1 e A J I t BE V BE =0.7V V CE =0.2V I C =I B =0 CE BE -V V B S E FR 11 I J A e - e ββ t V V E S B e β A J I Forward Active Saturation Cutoff Review from Last Lecture
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Simple dc model Simplified Multi-Region Model AF CE V V E S C V V 1 e A J I t BE t V V E S B e β A J I q kT V t V BE =0.7V V CE =0.2V I C =I B =0 Forward Active Saturation Cutoff V BE >0.4V V BC <0 I C < β I B V BE <0 V BC <0 A small portion of the operating region is missed with this model but seldom operate in the missing region Review from Last Lecture
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Simple dc model Equivalent Simplified Multi-Region Model AF CE B C V V 1 βI I t BE V V E S B e β A J I q kT V t V BE =0.7V V CE =0.2V I C =I B =0 Forward Active Saturation Cutoff V BE >0.4V V BC <0 I C < β I B V BE <0 V BC <0 A small portion of the operating region is missed with this model but seldom operate in the missing region Review from Last Lecture
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Simplified dc model Forward Active βI B I B B C E βI B I B B C E 0.6V Mathematically V BE =0.6V I C =βI B V BE =0.6V I C =βI B (1+V CE /V AF ) Or, if want to show slope in I C -V CE characteristics AF
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EE 330 Lect 20 Fall 2011 - EE 330 Lecture 20 Bipolar...

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