13 BJT Hybride Model - 1 ac Equivalent Transistor Model...

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Unformatted text preview: 1 ac Equivalent Transistor Model Hybrid Equivalent Model r e Equivalent Model Small signal Low frequency 2 Common-Base Configuration :- pnp transistor npn transistor Input or driving point Output or collector characteristics. characteristics. n p p E C B V BC V EB I C I E I B I E I C C E I B I E I C C E I B p n n E C B V CB I B I C I E V BE 3 4 Common-Emitter Configuration :- Output or collector characteristics. Input or driving point characteristics. p n n V CE V BE C E B I C I B I E n p p V EC V EB C E B I C I B I E (B) I C I E I B (C) (E) (C) (E) (B) I C I E I B 5 i b i c v be v ce b e e c r o b i β e r β + +-- h fe i b v ce v be h ie h re v ce i c i b h oe 1 + +-- b c e e Common-Emitter hybrid Equivalent Circuit :- Hybrid Equivalent Circuit r e Equivalent Circuit h ie = β r e h fe = β ( h re v ce → feedback ) 1/ h oe = r o v ce v be i b i c E E B C V BE I B V CE1 V CE2 ( ) A μ I C V CE I B 6 Mathematical …. :- Transistor Two-port Network output V o I i I o input V i output V o input V i I i I o 7 8 9 o i I o i i o V i i i V V V I I V V δ δ δ         ∂ ∂ +         ∂ ∂ = o i I o o i o V i o o V V I I I I I δ δ δ         ∂ ∂ +         ∂ ∂ = symbolically :- δ I i → i i δ I o → i o δ V i → v i δ V o → v o ) , ( Ω → → →         ∂ ∂ ohm h i v I V i o V i i o V i i ) ( unitless h v v V V r i I o i i I o i → → →         ∂ ∂ ) ( unitless h i i I I f o V i o o V i o → → →         ∂ ∂ ) , ( S siemens...
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This note was uploaded on 01/11/2011 for the course EE 2106 taught by Professor Ytchow during the Spring '07 term at City University of Hong Kong.

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13 BJT Hybride Model - 1 ac Equivalent Transistor Model...

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