15 FET Small Signal Analysis

15 FET Small Signal Analysis - Hi Fi amplifier...

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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
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2 Field-Effect Transistor Basic Principle DC Biasing Circuits ac Signal Circuits ac Equivalent Field-Effect Transistor Model ac Small-Signal Analysis
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5 Field-Effect Transistor Basic Principle DC Biasing Circuits ac Signal Circuits ac Equivalent Field-Effect Transistor Model ac Small-Signal Analysis
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6 Small Signal Analysis of FET Circuits :- Fixed-Bias Configuration :- +V DD v o v i R G R D C 2 C 1 V GG R S I G ~ 0A D S G G S D r d g m v GS R D R G v i v o V DD short circuit V GG short circuit Ω 0 1 C X Ω 0 2 C X G S D v GS i d r d g m v GS
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7 G i G i i i i R i R i i v Z = × = = G S D r d g m v GS R D R G v i v o i X i i v GS Z o Z i + + - - - +
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9 For example :- Z i , Z o , A v ?? R G ~ 1M Ω R D ~ 2k Ω V GSQ ~ -2V I DQ ~ 5.6mA I DSS ~ 10mA - V P = V GS(off) = -8V y OS ~ 40 μ s Ω = = M R Z G i 1 D d D o R k k k r R Z ~ 9 . 1 ~ 25 // 2 // Ω Ω Ω = = Ω = = = k s y r OS d 25 40 1 1 μ ( ) ?? // = - = d D m v r R g A - = = ) ( 1 off GS GS mo GS D m V V g V I g ms V mA V I g off GS DSS mo 5 . 2 8 ) 10 ( 2 2 ) ( = = = ms V V ms V V g g off GS GS mo m 9 . 1 8 2 1 5 . 2 1 ) ( = - - - = - = ( ) 6 . 3 ~ ) 25 // 2 ( 9 . 1 // - Ω Ω - = - = k k ms r R g A d D m v ?? = = i o i i i A undefined quantity !!
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10 Voltage-Divider Bias Configuration :- Just same as before - 2 1 // R R Z i = , d D o r R Z // = , ( ) d D m v r R g A // - = +V DD v o v i R 2 R D C 2 C 1 R S R 1 C S S G S D r d g m v GS R D R 1 //R 2 v i v o i X i i v GS Z o Z i + + - - - +
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11 Self-Bias Configuration :- (Case 1) Bypassed R S :- Just same as before - G i R Z = , d D o
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