12 BJT re Model - 1 BJT Transistor Modeling → small...

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Unformatted text preview: 1 BJT Transistor Modeling → small signal → low frequency r e Equivalent Model Hybrid Equivalent Model 2 Hi – Fi amplifier circuit design → analysis frequency response transistor pn - diode n / p – type semiconductor field-effect transistor npn / pnp ansistor semiconductor pn – diode applications low / high frequency response 3 npn / pnp Transistor Basic Principle DC Biasing Circuits 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 :- =--- 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 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 8 AC equivalent circuit Rearrange the circuit v o ⇒ ac → output signal R s ⇒ source internal resistor...
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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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12 BJT re Model - 1 BJT Transistor Modeling → small...

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