W09 314 HW10 Extra credit - ,2009 EECS314 Winter2009...

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Extra credit assignment Due Tuesday April 14, 2009 EECS 314 Winter 2009 Related to HW set 10 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2009 A. Ganago Page 1 of 11 EC Problem 1 Diode and MOSFET circuits as Logic Gates: Negative Logic The Big Picture When we analyze the logic function of a circuit, we have to solve 2 distinct questions: 1. What output voltage does the circuit produce for each of the possible combinations of input voltages? 2. What logic function corresponds to this combination of input and output voltages? To solve question 1, we have to perform the circuit analysis. Note that in the circuits below the sources are not shown explicitly. For example, the first circuit can be redrawn – with the sources shown – as follows: In the circuit analysis, we assume that the input voltages A and B and the output voltage C can be either LOW ~ 0 V or HIGH ~ 5 V. To determine whether each of the diodes conducts, use the offset diode model. Assume that a MOSFETs conducts (acts as a short circuit between the source S and the drain D) if the gate (G) voltage V GS exceeds 2 V; otherwise there is no current flowing between the source and the drain; always neglect the current through the gate terminal. To answer question 2, we have to compare the obtained combination of HIGH and LOW voltages with the known truth tables. In this problem, use negative logic: HI voltage means “0” or false, and LO voltage means “1” or true. Part 1 2 3 4 Total
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Extra credit assignment Due Tuesday April 14, 2009 EECS 314 Winter 2009 Related to HW set 10 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above © 2009 A. Ganago Page 2 of 11 EC Problem 1 The Assignment For each of the circuits, determine the output voltage (the voltage drop across a forward‐biased diode is ~0.7 V, within the error margin for both LOW and HIGH voltages; if needed, assume R = 1k Ω ). Circuit 1 = Part 1 (15 points) Circuit 2 = Part 2 (15 points) A B C HIGH HIGH LOW HIGH HIGH LOW LOW LOW Fill in the truth table for each of the circuits. Then, determine the type of gate, using negative logic : Your answers: ____________________ ______________________ A B C HIGH HIGH LOW HIGH HIGH LOW LOW LOW A B C “1” “1” “0” “1” “1” “0” “0” “0” A B C “1” “1” “0” “1” “1” “0” “0” “0”
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Extra credit assignment Due Tuesday April 14, 2009 EECS 314 Winter 2009 Related to HW set 10 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking
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