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Chapter 5FET3 - /2/12 Chapter 5 Field-Effect...

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S J T U J. C h e n 1 3/2/12 Chapter 5 Field-Effect Transistors (FETs)
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3/2/12 SJTU J. Chen 2 The CS amplifier with a source resistance
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3/2/12 SJTU J. Chen 3 Small-signal equivalent circuit with ro neglecte d Ø Voltage gain Ø Overall voltage gain l RS takes the effect of negative feedback l Gain is reduction by (1+ gmRS ) S m L D m v R g R R g A + - = 1 ) // ( S m L D m sig G G v R g R R g R R R G + + - = 1 ) // (
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3/2/12 SJTU J. Chen 4 Ø Biasing with constant current source I Ø Input signal vsig is applied to the source Ø Output is taken at the drain Ø Gate is signal grounded Ø CC1 and CC2 are coupling capacitors The Common-Gate amplifier
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3/2/12 SJTU J. Chen 5 The CG amplifier Ø A small-signal equivalent circuit Ø T model is used in preference to the π model Ø Ro is neglecting
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3/2/12 SJTU J. Chen 6 The CG amplifier fed with a current-signal in put Voltage gain Overall voltage gain ) // ( L D m v R R g A = sig m L D m v R g R R g G + = 1 ) // (
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3/2/12 SJTU J. Chen 7 Noninverting amplifier Low input resistance Relatively high output resistance Current follower Superior high-frequency performance Summary of CG amplifier
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3/2/12 SJTU J. Chen 8 Ø Biasing with current source Ø Input signal is applied to gate, output signal is taken at the source The common-drain or source-follower amplifi er
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3/2/12 SJTU J. Chen 9 The CD or source-follower amplifier Ø Small-signal equivalent- circuit model Ø T model makes analysis simpler Ø Drain is signal grounded Overall voltage gain 1 1 // // + + = m L o L o sig G G v g R r R r R R R G
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3/2/12 SJTU J. Chen 10 Circuit for determining the output resistan ce
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3/2/12 SJTU J. Chen 11 Very high input resistance Voltage gain is less than but close to unity Relatively low output resistance Voltage buffer amplifier Power amplifier Summary of CD or source-follow amplifier
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