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week12

# week12 - ECE 3150 Spring 2009 Week 12 Recitation Lab 4 and...

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ECE 3150 Spring 2009 Week 12 Recitation Lab 4 and Homework 9 due on Friday. Homework 9 is much simpler than previous ones. We will finish most of the first-order circuits on Wednesday, and start digital circuits soon. For Wednesday and Thursday sessions, you can make them shorter, as the students have spent much time for labs and there are two assignments due. Additional problems if there is time remaining: students probably need more time to digest the effective impedance method, especially in CD amplifiers. CS amplifier: ( 29 x gs m L gs x sig gs x i v g R v v R v i + - = + - = ' / / Canceling v gs and rearranging to obtain the ratio of v x and i x . ( 29 ' ' 1 / L sig L m x x gd R R R g i v R + + = = Fig. 1. The small-signal circuits for the CS amplifier with ideal biasing circuits. CG amplifier: s vo o out vo L m o m L o in R A r R A R g r g R r R + = + 2245 + + = 1 1 (7.20) g m v gs v sig + - R sig R L = R L || r o + v out - - v x + i x + v gs - 1

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Fig. 2. The small signal circuit for the CG amplifier with the capacitors.
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week12 - ECE 3150 Spring 2009 Week 12 Recitation Lab 4 and...

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