# 03 - McGill University Faculty of Engineering Department of...

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1 McGill University Faculty of Engineering Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Examiner: Dr. David V. Plant; _____________________ Associate Examiner: Dr. Mourad El-Gamal (signature on file) Date: Friday, December 19, 2003 Time: 9:00 12:00 Calculator: Faculty Standard Pertinent Information: 1) This is a closed-book examination, no notes permitted. There are 3 pages of equations provided at the back of the examination. 2) The examination consists of 7 problems; you must answer all 7 problems. 3) The examination is worth 77 total points 4) The examination consists of 12 pages, including this page and the equations pages; please ensure you have a COMPLETE examination paper. 5) Only the Faculty Standard Calculator is permitted. 6) Questions may be completed in any order, however ensure that you clearly identify which part of which question you are attempting. Do NOT turn in this exam with your exam booklet

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Question 1 (9 pts) The following circuit makes use of a transconductance (voltage-to-current) amplifier to create a current in R L. The amplifier has an input resistance of 1MO and an output resistance of 100O. There are M diodes (n=2) in parallel with the load R L . You may use the constant voltage drop model for these diodes. v s V BIAS =1V R S =100k D 1 D 2 D M G MS R L =50ohms i L a) [2 pts] Find a condition on the short-circuit transconductance G MS so that all the diodes can conduct. For the remaining parts of this question, let G MS = 50mA/V b) [2 pts] Determine the current in each diode as a function of M. c) [2 pts] Draw the small-signal model for this circuit, assuming all diodes are conducting. d) [3 pts] Assume there is a small input voltage ripple v s = |v s |sin( ω t) as shown. What magnitude of v
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03 - McGill University Faculty of Engineering Department of...

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