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CC(EF) Series Shunt Feedback Amplifier

# CC(EF) Series Shunt Feedback Amplifier - the at circuit...

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Common-collector Amplifier (Emitter Follower). First you need to recognise that the feedback topology is series shunt with R E being the feedback network. This is the only component that connects the output to the input, take note that this resistor is commonly known as emitter feedback or degeneration. Solution using circuit theory only R E R B v i v i R E R i R i r π R B v i v o i b β f i b Circuit without R S Small signal a.c. equivalent circuit at mid-frequency ( 29 ( 29 9978 . 0 250 113250 113250 250 750 151 750 151 1 1 = + = + × × = + + + = = π β β r i R i R i v v A A b E b f E b f i o vf v ( 29 = + × = + + = = 500 , 113 250 750 151 1 π β r R i v R R E f b i if i = = = + = 652 . 1 6556 . 1 // 750 151 250 // 750 1 // f E of o r R R R β π Note: = = = 159 , 45 000 , 75 // 500 , 113 // ' B if i R R R

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Solution using feedback theory only R y R x v o i o v f i f β v v o R E v o i o v f i f Ideal practical feedback network Practical feedback network = = = 0 0 input
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Unformatted text preview: the at circuit short i v R o v f f x Ω = = = = 750 E i o o y R output network feedback the at circuit open i v R f 1 = = = output network feedback the at circuit open v v f i o f v β R E v o v i r π i b (1+ ) β f i b Open loop equivalent circuit! Ω = = 250 π r R i Ω = = 750 E o R R ( 29 453 250 750 151 1 = × = + = β r i R i A b E b f v 454 1 453 1 1 = × + = + v v A ( 29 Ω = × = + × = 500 , 113 454 250 1 v v i if A R R Note: R i is used and not R s +(R i //R B ) ( 29 Ω = = + = 652 . 1 454 750 1 v v o of A R R ( 29 9978 . 454 453 1 = = + = v v v vf A A A...
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