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Posted By: Rajasekaran Member Level: Silver Posted Date: 23 Dec 2007
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2007 Anna University B.E Electronics and Communication EC 1201 – DIGITAL ELECTRONICS Question paper
B.E/B.Tech DEGREE EXAMINATIONS,NOVEMBER/DECEMBER 2007
Third Semester
Electronics and Communication Engineering
EC 1201 – DIGITAL ELECTRONICS
Time: Three hours Maximum Marks:100 marks
Answer ALL questions
PART A - ( 10 * 2 = 20 marks)
1. State and prove Demorgan's theorem.
2. What do you mean by the gray code? What are its applications.
3. What is Demultiplexer.
4. What is Tristate Gate.
5. What is flip-flop also known as a latch?
6. What is a sysnchronous sequential circuit/
7. Difference between Moore and Mealy circuit.
8. What is transition Table.
9. Comparison between PAL and PLA.
10. What is FBGA. Explain it briefly.
PART B - ( 5 * 16 = 80 marks)
11.a. Simply the four variable switching function
F(A,B.C.D ) = em(3,5,6,8,9,12,13,14)+ ed(0,2,7).
Or
b. Prove that
a) If A + B = A + C and A' + B = A' + C , then B = C.
b) If A + B = A + C and AB = AC, then B = C.
c) Given AB' + A'B = C, show that AC' + A'C = B.
12.a. Realize F(W,X,Y,Z) = S(1,4,6,7,8,9,10,11,15) using 4- to -1 Mux.
(OR)
b. Design a Binary to Gray converter?
13.a. Draw the circuit and explain the working operation of JKMS flip-flop.
(OR)
b. Explain the various steps in the analysis of synchronous sequential circuits
with suitable example.
14.a. Implement the switching function f(x1 x2 x3) = x1 x2' + x2 x3 by a static hazard
free 2 level AND-OR gate network.
(OR)
b.i)What is the characteristic equation of a D flip-flop?
ii)Using JK flip-flops,design a parallel counter which counts in the sequence
101,110,001,010,000,111,101,.........
15.a.Implement binary to excess 3 code converter using ROM.
(OR)
b. Design a PLA circuit for F1 = Sm(2,4,7), F2 = Sm(1,6,7)
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