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Unformatted text preview: ECE 2030 C&D Exam  Key 1. The Georgia Tech Honor Code governs this examination.
2. There are 9 questions and 11 pages including two blank worksheets. Make sure
you have them all. 3. Please write/draw legibly. Use the work sheets for generating the solutions before
providing the final answer. 4. State any assumptions you feel you have to make or ask for clarification. 5. Keep in mind it is difficult to give partial credit without written material. Please
make sure you document any partial solutions.
6. The exam is 50 minutes.
7. Plan your work! Points are noted next to each problem.
Problem Max Points Graded
1 10
2 10
3 10
4 10
5 10
6 5
7 10
8 10
9 15
Total 100 Student Name: Student Number: 1. Fill in the missing entries in the following table: Decimal 6bit Binary 8bit Binary Octal Hexadecimal 33 loom: 1H 2;“
#25 Qiiﬂii} 000mm} :31 1A 2. Provide a switch level implementation of the Boolean function defined by the following truth
table: 55; i m z. HHHHOOOO>
b—AHOOHHOOUJ
r—tOHor—tor—AOO
>—x o o o o >—* o GIFT] 3. Complete the following CMOS implementation by designing the pull down network. Provide
expressions for OUT and OUT'. Vdd OUT: 85)
OUT: QUE4%) “PCE 4. Implement the following expression using only NOR and NOT gates. Use the mixed logic
notation we have used in class. Do not assume that the complements of the inputs are available.
Do not simplify the expression. Provide the number of transistors in the implementation. A and D are active low signals.
F = (C(A' + B)')' + (D’E)' Number of Transistors: & 5. The following circuit was designed using a mixed logic design methodology. Write the Boolean
expression that is computed by this circuit. A» B F 0— WM
B‘ 5(7131342» NBC—“3(3)
C%— W"?
HE :2 “(SCH st, :4} n (T
@033 C_ D O 6. Consider the following gate level Circuit, propagation delays and its input waveform as shown.
Draw the output waveform. You can assume that A, B, and C are low for all t such that t < 0. 7. Draw the DeMorgan equivalent gates. WW 8. The following is a truth table for a Boolean expression.
a. Write the expression in sum—of—rninterrns form and productofmaxterms forrn. A B c F
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 0
1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 0
M1305): (F) +@*C>(ﬂ+ (ﬂ + (3 44) .— WmW=éJELaﬁﬂﬂ?1ﬂEL+R@Z b. Now simplify the SOP expression algebraically. . . :5») 47% if; 11' <5; :19; a" r _
“ ‘%/&é+iﬁ§}‘+g(aé *W“.
. K w . ...
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 Spring '10
 Wills

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