final_08 - THE UNIVERSITY OF BRITISH COLUMBIA DEPARTMENT OF...

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T HE U NIVERSITY OF B RITISH C OLUMBIA D EPARTMENT OF E LECTRICAL AND C OMPUTER E NGINEERING EECE 254 — Electronic Circuits I F INAL E XAMINATION Sections 101 & 102 Instructors: D. Pulfrey & R. Turner December 12, 2008 Partial Scores Q1 _________ / 9 Q2 _________ / 18 Q3 _________ / 5 Q4 _________ / 11 Q5 _________ / 12 Q6 _________ / 13 Q7 _________ / 5 Q8 _________ / 8 Q9 _________ / 10 Q10 _________ / 14 Instructions 1. This exam paper consists of 18 pages. Count and verify that this copy is complete. Do not separate the pages. 2. Note that the exam poses questions worth 105 points, however it will be graded out of a maximum of 80 points. You may attempt as many points as you wish, but the maximum number of points credited will be 80. 3. All answers and calculations are to be written on the exam paper in the space provided. Use the backs of pages for rough work or, if necessary, for additional answer space— clearly mark which question the work pertains to. 4. No formulae sheets or notes of any kind are permitted, except those distributed with the exam paper; programmable calculators are permitted. 5. The time allotted to complete this exam is 3 hours. 6. Print clearly! Marks can not be given for answers that can not be interpreted. Total Score (out of 80 points) Name (print): ______________________________________ ID Number: ______________________________________
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Page 2 1. Consider the diode circuit shown below where the diodes can be assumed to be ideal. ± 3 V 10 k ² 10 k ² +3 V v o v i D 1 D 2 0 t (ms) ± 12 V +12 V 24 48 72 v ( t ) i 6 pts (a) If v i ( t ) is the symmetric triangular waveform shown above, sketch and fully label the output waveform v o ( t ) of the circuit. Indicate all relevant voltages and times. 0 t (ms) 24 48 72 v ( t ) o 3 pts (b) When v i ( t ) = +12 V, what current would flow through each diode?
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Page 3 2. Design a power supply circuit that provides a nominal output voltage V L = +8 V, with a ripple voltage V r = 1 V (peak-to-peak), when a 100 ± load is attached. The circuit is to be supplied from a 120-V (rms), 60 Hz line voltage. You may choose any configuration (half-wave or full-wave), and use as many diodes and passive components as you wish.
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