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# 07 - ECSE 330 Final Exam McGill University Faculty of...

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ECSE 330 Final Exam 1 McGill University Faculty of Engineering Department of Electrical and Computer Engineering ECSE-330A – Introduction to Electronics Examiner: Mr. Joshua Schwartz; _____________________ Associate Examiner: Dr. David Plant______________________ Date: Thursday, December 6 th , 2007 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 73 total points 4) The examination consists of 11 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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ECSE 330 Final Exam 2 Question #1 (10 points) Consider the multi-stage cascade of op-amps shown below. Assume that all op-amps are ideal. a) [1 pt] Find an expression for ܸ ைଵ in terms of ܸ and ܸ b) [1 pt] Find an expression for ܸ ைଶ in terms of ܸ ைଵ c) [1 pt] Find an expression for ܸ ைଷ in terms of ܸ and ܸ d) [5 pts] Find expressions for the following: I. R in1 II. R in2 III. R inB IV. R in3 V. R out e) [2 pts] If the op-amp in Stage B is otherwise ideal but now has a finite open-loop voltage gain ‘A’ such that V O2 = A·(v + -v - ), show that: ܸ ௢ଶ ܸ ௢ଵ 1 ൅ ܴ ிଶ ܴ ்ଶ 1 ൅ 1 ൅ ܴ ிଶ ܴ ்ଶ ܣ
ECSE 330 Final Exam 3 Question #2 (12 points) In the circuit below, assume that all diodes are ON and that they are identical. “v s ” is a signal source only. a) [3 pts] Using the exponential model of the diode, find an expression for the DC voltage V O , in terms of V CC , diode parameter n, and thermal voltage V t For parts (b) to (d), let r d1 -r d5 represent the small-signal resistances of D1-D5, respectively.

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