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12 BJT re Model

# 12 BJT re Model - BJT Transistor Modeling small signal low...

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1 BJT Transistor Modeling small signal low frequency r e Equivalent Model Hybrid Equivalent Model

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2 Hi – Fi amplifier circuit design analysis frequency response transistor pn - diode n / p – type semiconductor field-effect transistor npn / pnp transistor semiconductor pn – diode applications low / high frequency response
3 npn / pnp Transistor Basic Principle DC Biasing Circuits

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5 Voltage - Divider Configuration Circuit Analysis DC!! Thevenin's Equivalent Voltage :- Thevenin's Equivalent Resistance :- CC Th V R R R V 2 1 2 + = 2 1 2 1 2 1 // R R R R R R R Th = + = Kirchoff’s voltage law :- 0 = - - - E E BE Th B Th R I V R I V E Th BE Th R R V V I B ) 1 ( + + - = β E Th BE Th E Th BE Th B C R R V V R R V V I I + - + + - = = β β β β 1 1 I BQ , I CQ , I EQ , V CEQ Quiescent Point Q-Point R C R 1 +V CC R E R 2 v out v in C 2 C 1 C 3 R C R 1 +V CC R E R 2 I B R C +V CC R E R Th V Th I B I C I E

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6 ?? with ac signal ?? in out v v Gain Voltage = in out i i Gain Current = in out p p Gain Power = R C R 1 +V CC R E R 2 v in C 2 C 1 C 3 I B V B v out i in i out v out v in p out p in i in i out
7 npn / pnp Transistor Basic Principle DC Biasing Circuits ac Signal Circuits ac Equivalent Transistor Model ac Small-Signal Analysis

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8 AC equivalent circuit Rearrange the circuit v o ac output signal R s source internal resistor v s ac source signal small signal C 1,2,3 short circuit (reactance
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