Important Questions in DPSD DIGITAL PRINCIPLES AND SYSTEM DESIGN 141302 subject for NOV/DEC 2011 ANNA UNIVERSITY OF TECHNOLOGY EXAMINATIONS FOR SECOND YEAR SEMESTER THIRD SEMESTER CSE Students

141302 - DIGITAL PRINCIPLES ANS SYSTEM DESIGN

UNIT I

1. Determine the prime-implicants of the Boolean function by using the tabulation method.F(w, x, y, z)=Σ(1,4,6,7,8,9,10,11,15)

2. Simplify the following Boolean expression using Quine McCluskey method:

F=∑m(0,9,15,24,29,30)+d(8,11,31).

3. Design a combinational logic diagram for BCD to Excess-3 code converter

4. Find a minimum sum of products expression for the following function using Quine- McClusky method.

F (A,B,C,D,E) = ∑(0,2,3,5,7,9,11,13,14,16,18,24,26,28,30)

5. Determine the minimum sum of products and minimum product of sums for f = b’c’d’+bcd+acd’+ab’bc’d

6. Find the minterm expansion of f(a,b,c,d) = a’(b’+d)+acd’

UNIT II

1. With a suitable block diagram explain the operation of BCD adder

2. Draw and explain the working of a carry-look ahead adder.

3. Write the HDL description of the circuit specified by the following Boolean function.

x =AB+ C y= C′.

4. Design a combinational logic diagram for BCD to Excess-3 code converter

UNIT III

**1. **Implement the given Boolean function using 4 × 1 multiplexer.

F(x, y, z) =Σ(1, 2, 6, 7) .

**2. **Explain with necessary diagram a BCD to 7 segment display decoder.

**3. **Design a BCD to excess 3 code converter using a ROM

**4. **What are the advantages of PLA over ROM? Explain the internal construction of PLA

**5. **Design and explain the working of a 1 to 8 demultipexer

UNIT IV

1. Design and explain the working of a up-down ripple counter

2. Using JK flip-flops design a parallel counter, which counts in the sequence

101,110,001,010,000,111,101…

3. Design a synchronous sequential circuit using JK flip-flop to generate the following sequence and repeat. 0, 1, 2, 4, 5, 6

4. What is the aim of state reduction? Reduce the given state diagram and prove that the both state diagrams are equal.

UNIT V

1. With suitable example and diagram explain the hazards in combinational and sequential logic circuits

2. Design the Tflip flop from the logic gates

3. Design a non sequential ripple counter which will go through the states

3,4,5,7,8,9,10,3,4………………..draw bush diagram also

4.Explain essential, static and dynamic hazards in digital circuit. Give hazard-free realization for the following Boolean function .

F(I,J,K,L)= S(1,3,4,5,6,7,9,11,15)

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