Electronics-I Lecture 28

Electronics-I Lecture 28 - BaseEmitterInputresistance vbe =...

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Lecture 28 Electronics I 1 Base-Emitter Input resistance  We Know                      and                                                         .           e e b be r i r i v = = π e b e r i i r = e r r ) 1 ( + = β 1 + = β i at i we know th e b B T m b be I V g i v r = = = β E T m e be e I V g i v r = = = α
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Lecture 28 Electronics I 2 Voltage Gain           Voltage Gain g m  is directly proportional to collector Bias  Current I C The gain is as stable as collector Bias Current       C C CC C R i V v - = C c C CC C R i I V v ) ( + - = C c C C CC C R i R I V v - - = C c C C R i V v - = C be m C c c R v g R i v - = - = T C C C m be c v V R I R g v v A - = - = = / be C m c v R g v ) ( - =
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Lecture 28 Electronics I 3 Small-Signal Equivalent Circuit  Models Small-signal circuit  model DC bias voltage  supplies short  circuited
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This note was uploaded on 12/12/2010 for the course EE 1 taught by Professor Shahidanwar during the Spring '10 term at NUCES.

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Electronics-I Lecture 28 - BaseEmitterInputresistance vbe =...

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