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Unformatted text preview: EECS 314 Fall 2007 HW 08 Grading Policy 2007 Alexander Ganago Problem 1 25 points Problem 2 25 points Problem 3 25 points Problem 4 30 points (one point for each correct answer) Problem 5 30 points (one point for each correct answer) Problem 6 15 points (one point for each correct answer) Problem 7 25 points (5 points for each part) = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Total = 175 points, as usual EECS 314 Fall 2007 HW 08 Problem 1 Student's name ___________________________ Discussion section # __________ (Last name, first name, IN INK) Alexander Ganago Page 1 of 2 The big picture Semiconductor diodes are nonlinear circuit elements: they do not obey Ohms law. The voltagecurrent characteristics of diodes can be approximated using one of several models; for simplicity, each problem assignment specifies which model to use. In this problem, use the offset diode model: the diode acts as an open circuit unless it is biased at V DO ; the voltage drop across the diode does not exceed V DO (see the sketch). Problem Part 1 Assume a DC voltage source V S = 6 V, LightEmitting Diode (LED) with V DO = 1.7 V, and a load resistor equal to 330 . Calculate the following parameters and write your answers in the blanks: a) The current in the circuit: __________________________ mA b) The power dissipated by the LED: __________________________ mW Part 2 Assume that the LED can sustain currents up to 40 mA. Calculate the minimal load resistance in such that the current through the LED does not exceed 40 mA and the LED shines. (In this part, assume a DC voltage source V S = 6 V ) Your answer: __________ Part 3 Suppose that the load resistance is kept at 330 but the source voltage can vary. Calculate the range of source voltage values V S such that the current through the LED does not exceed 40 mA and the LED shines. Your answer: from _____________________ to _________________ volts From the given information and your results obtained above, determine whether the maximal power dissipated by the LED in Part 2 is the same as that in Part 3. If the power values differ, explain which one is larger and by how many percent. Your answer: _________________________________________________________ _____________________________________________________________________ The problem is continued on the following page 330 EECS 314 Fall 2007 HW 08 Problem 1 Student's name ___________________________ Discussion section # __________ (Last name, first name, IN INK) Alexander Ganago Page 2 of 2 Assorted diode circuits. (Expect similar problems on exam 3 ;) Use the offsetdiode model (the diode acts as an open circuit unless it is biased at +0.7 V; the voltage drop across the diode does not exceed +0.7 V) and calculate the following parameters for each circuit: a) The current through the circuit b) The output voltage V Show your work on a separate page....
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This note was uploaded on 09/04/2008 for the course EECS 314 taught by Professor Ganago during the Fall '07 term at University of Michigan.
 Fall '07
 Ganago

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