Electronics-I Lecture 31

Electronics-I Lecture 31 - Lecture 31 Electronics I 1 CE...

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Unformatted text preview: 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 Lecture 31 Electronics I 2 CE Amplifier with R e Input Resistance R in R in = R B || R ib R ib v i /i b i e = v i /(r e + R e ) i b = i e (1 - )= i e /(1+ ) i b = v i /[(r e + R e ) (1+ )] R ib = v i /i b (replace i b ) = (r e + R e )(1 + ) Input resistance is (1 + ) times the total resistance in the emitter Multiplication by a factor of (1 + ) is known as resistance-reflection rule 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...
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Electronics-I Lecture 31 - Lecture 31 Electronics I 1 CE...

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