Electronics-I Lecture 43

Electronics-I Lecture 43 - CommonGateAmplifier Lecture 43...

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Lecture 43 Electronics I 1 Common Gate Amplifier
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Lecture 43 Electronics I 2 Common Gate Amplifier Input Resistance  R in  = 1/g (Relatively low) Input Voltage 1/g m >> R sig  to keep the  loss in signal strength  small S m sig Sig m m sig i R g 1 v R g 1 g 1 v v + = + =
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Lecture 43 Electronics I 3 Common Gate Amplifier Drain Current  i d  = -v i /(1/g m ) = -v i g m Output Voltage v O  = -i d (R L ||R D ) = v i g (R L ||R D ) Voltage Gain  A v  = g (R L ||R D )
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Lecture 43 Electronics I 4 Common Gate Amplifier Open Circuit Voltage Gain  A vo  = g R D Overall Voltage Gain     Output Resistance R out  = R D Sig m L D m Sig m V V Sig m m V sig in in V V R g R R g R g A G R /g /g A R R R A G + = + = + = + = 1 ) || ( 1 1 1
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Electronics I 5 Unlike CS amplifier, CG amplifier is non  inverting  CS amplifier has high input resistance,  CG amplifier low input resistance
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This note was uploaded on 12/12/2010 for the course EE 1 taught by Professor Shahidanwar during the Spring '10 term at NUCES.

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Electronics-I Lecture 43 - CommonGateAmplifier Lecture 43...

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