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# final_01 - Final Exam ECE 137A Wednesday 8-11 AM Closed...

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Final Exam, ECE 137A Wednesday March 21, 2001 8-11 AM Closed Book Exam. Class Crib-Sheet and 2 pages (4 surfaces) of student notes permitted Do not open this exam until instructed to do so. Use any and all reasonable approximations, after stating them . Please write your final numerical answers in the spaces indicated. Show your work: Full credit will not be given for correct answers if supporting work is missing. There are xx problems, and you have xx hours. Name: __________________________ 1

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Problem 1, 40 points Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 +Vdd -Vss R1 Vout Vin+ Vin- R2 All transistors are enhancement-mode mosfets whose |Vt|=0.25 volts, K=1 mA/V^2, and lambda=1/50 volts The supplies are + and - 5 volts 2
Part 1, 5 points Q1 and Q2 are to be biased at 100 microamps drain current. Q4 is to be biased at 1 mA drain current. Find R1 and R2 R1=_______________ R2=_______________ 3

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Part 2, 7 points The circuit is an op-amp, work bias conditions from the assumption of Vout=0 Volts Draw on this diagram
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final_01 - Final Exam ECE 137A Wednesday 8-11 AM Closed...

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