Exam 3 part 2 ans

Exam 3 part 2 ans - [email protected] - icl.syr.edu Exam...

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[email protected] - icl.syr.edu Exam 3_P2 ELE232 – Electrical Fundamentals II – 14APR2008 Exam 3 – Part 2 - Answers Problem 1 : An engineer is taking data from a sensor that can be modeled as a time varying voltage source v sen (t) in series with a 800pf capacitor . Before that data can be used it will be amplified as shown . The pass-band voltage gain needs to be 20 and the cutoff frequency 25 Hz . (a) Calculate a value for R S that will produce a g m for the transistor of 2 mmhos . g m = 2K V GS " V T ( ) = 2(2) V GS " 2 ( ) = 2mmhos . V GS = 0.5 + 2 = 2.5v . The drain current will be I D = K V GS " V T ( ) 2 = 2 2.5 " 2 ( ) 2 = 0.5ma . V GS = I D R S = 2.5v = 0.5ma ( ) R S . R S = 2.5v 0.5ma = 5K . (b) Draw the small signal equivalent circuit for the amplifier assuming that C S is large enough to act as a short in the frequency range of interest . (c) Choose a value for R D that will provide a pass-band gain of twenty . In the pass-band the 800pf capacitor behaves like a short circuit and
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This note was uploaded on 05/08/2008 for the course ELE 232 taught by Professor Phelps during the Spring '08 term at Syracuse.

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Exam 3 part 2 ans - [email protected] - icl.syr.edu Exam...

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