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Midterm #1 - Fall 2011

# Midterm #1 - Fall 2011 - ECE 331 Digital System Design...

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ECE 331 – Digital System Design Midterm #1: Wednesday, October 5, 2011 Closed book. NO calculators permitted. Show all of your work. Use written English, where applicable. Always write neatly. A solution requiring physical units is incorrect if the units are omitted from the result. Indicate solution in provided space. If none is provided, underline, circle or box the result. HONOR CODE PLEDGE: “On my honor I have neither given nor received aid on this exam” Your first and last name (printed) : _____________________________________ Your Signature : ____________________________________________________ Failure to sign the pledge may result in no credit for the exam. Score: _______________ [65] Score: _______________ [100] Fall 2011 page 1 of 14

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ECE 331 – Digital System Design Multiple Choice (Circle the correct answer) 1. [2 pts] What is the minimum number of bits necessary to represent the decimal number +129 using Sign and Magnitude representation? (a) 7 (b) 8 (c) 9 (d) 10 2. [2 pts] Given the following electrical specifications for two logic gates (from their data sheets): Driver Load V OH V OL V IH V IL 2.9 V 0.85 V 2.0 V 0.5 V Calculate the NM H and the NM L . (a) NM H = 2.05 V; NM L = 1.5 V (b) NM H = 0.9 V; NM L = 0.35 V (c) NM H = – 0.9 V; NM L = 0.35 V (d) NM H = 0.9 V; NM L = – 0.35 V Fall 2011 page 2 of 14
ECE 331 – Digital System Design 3. [2 pts]

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