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Exam_3_solution_F08 - ECE 345 Fall 2008 Exam Ill 100 Points...

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Unformatted text preview: ECE 345 Fall 2008 Exam Ill 100 Points 50 Minutes Problem Pa e 8 Value Score 1 1—2 30 2 3 20 3 4 25 4 5 25 TOTAL Instructions: 1. Legibly PRINT your name and PID number below. 2. Closed book/ Closed notes. 3. Present all answers in proper engineering notation. 3. No programmable or graphing calculators allowed. Only simple scientific calculators permitted 4. Work only 1n the spaces provided. Show all work. 5. Keep your eyes on your own work. Any and all cheating will be dealt with to the fullest extent of University policy. 6. Turn off and stow any cell phones, PDA‘s, etc. 7. Make sure that you have all 5 pages. PRINT NAME: SG AMT; {fi 5&3 PID: l. (30) A. (6) Sketch and completely label the collector—emitter output characteristics (VCE vs. Ic) for a two values of base current (131 and 132) for a generic BJ T. Identify the saturation, active and cutoff regions on your sketch. g a???” mirage; . ifi’ gag“? syu‘gfifitfi g tafiféra: : _k- $- /” KB; *5 { fifiatw¥fg B. (8) For the NPN transistor shown below, identify and label the following: a. the three terminals emitter (E), Collector (C), and base (B); b. IC, 10, and 1b and their directions; 0. Vcb and Vbe and their polarities. C. (4) Find ic assuming ib = Sma and i6 = 4ma. a ‘ rel write 6;} Kim" AWE ‘ . J 9 ,, H ?m f”? .4. m ‘33 €34» :3: a. g séfitrgtt“fifi:fiiing GE 1. Continued D. (12) Consider the following BJT circuit: Determine whether or not the transistor is in the saturation region by utilizing the saturation region equivalent model given below. swig) Modem a g) Wmmmm twu’V'v’K'v't-‘MMW, (WM-«aw mewmm»,-Wflw»m W , mm, .W« “V 2. (20) . A. (10) Fmd Ceq. Answer: For t < 0, Vc(t) = For t > 0, vc(t) = 4. (25) Find iL(t) for all t. Answer: For t < 0, iL(t) = é @6% fig Fort>0,iL(t)= A}? 25:33 ...
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