Electronics-I Lecture 32

Electronics-I Lecture 32 - CEAmplifierwithRe...

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Lecture 32 Electronics I 1 CE Amplifier with R e CE Amplifier with R e Input resistance R ib   increased by (1 + R e g m ) Voltage Gain A v  reduced by    (1 + R e g m ) For same nonlinear  distortion, the input signal (1  + R e g m ) times larger can be  applied  Voltage gain is less  dependant on  β   High-frequency response is  improved 
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Lecture 32 Electronics I 2 Common-Base Amplifier Common Base  Amplifier with  constant current  source biasing Input signal applied at  Emitter. Output Amplified  signal at Collector
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Lecture 32 Electronics I 3 Common-Base Amplifier BJT replaced by T- equiv. circuit Input Resistance R in  = r e v o  = - α i e (R || R L ) i = -v i /r e v o  =  α  v i  (R || R L ) /r   v o /v i  =  α  (R || R L ) /r e Voltage Gain A v A v  =  α (R || R L )/r e     = g m (R || R L ) Identical to CE e m r g α = since
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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 32 - CEAmplifierwithRe...

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