Electronics-I Lecture 31

Electronics-I Lecture 31 - CEAmplifierwithRe...

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Lecture 31 Electronics I 1 CE Amplifier with R e Adding R e  leads to  significant changes  in amplifier  characteristics Amplifier T Model  with r o r o  is large it can be  eliminated with little  effect on amplifier  performance
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Lecture 31 Electronics I 2 CE Amplifier with R e Input Resistance R in    R in  = R || R ib   R ib    v i /i b i e  = v i  /(r e  + R e ) i b  = i e (1 -  α )= i e /(1+ β ) i b  = v i  /[(r e  + R e ) (1+ β )]   R ib  = v i /i (replace i b )         = (r e  + R e )(1 +  β ) Input resistance is (1 +  β times the total resistance  in the emitter Multiplication by a factor  of (1 +  β ) is known as  resistance-reflection rule
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Lecture 31 Electronics I 3 CE Amplifier with R e Including R e  substantially  increases R i R ib  (with R e )/R ib  (without  R e The designer can select  R e  to control the value  R
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