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

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McGill University Faculty of Engineering Department of Electrical and Computer Engineering ECSE-330A – Introduction to Electronics Examiner: Dr. David V. Plant; _____________________ Associate Examiner: Dr. Ramesh Abhari ______________________ Date: Monday, December 12, 2005 Time: 2:00 – 5:00 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 6 problems; you must answer all 6 problems. 3) The examination is worth 66 total points 4) The examination consists of 10 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 (12 pts.): Two amplifiers are cascaded to provide current to drive the load as shown in Fig 1a. A 1 is a voltage amplifier and A 2 is a transconductance amplifier . Both A 1 and A 2 have Rin = Rout = R . Assume all the diodes are identical and use the constant-voltage drop model. Fig. 1a a) [3 pts.] Redraw the circuit and replace the amplifiers with their equivalent circuits. (Note: Leave the diodes as they are, do not replace them with a small signal model). b) [3 pts.] Assuming all the diodes are OFF, find an expression for the overall transconductance G m_tot = I out /v s in terms of the R s , R, R L , A v and G m . For part c), use R s = 1k , R in = R out = 10k , R L = 2k , A v = 200V/V, Gm = 500mA/V . c) [3 pts.] If the current flow through the diodes is I d = 5mA, calculate v s . d) [3 pts.] For the circuit shown in Fig 1b, find an expression for the voltage gain v out /v s .
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05 - McGill University Faculty of Engineering Department of...

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