Digital Logic 2077

Group A

Long Answer Questions.

Attempt any Two questions.     (2x10=20)

1. What is decoder? Design BCD to Decimal Decoder with truth table and logic diagram.  (2+8)

2. Define combinational logic circuit. Design a combinational circuit whose input is a four-bit number and output is 2's complement of the input number.    (2+8)

3. What is ring counter? Explain ring counter with diagram, timing sequence and timing diagram.    (2+8)

Group B

Short Answer Questions.

Attempt any Eight questions.     (8x5=40)

4. Convert (1011.110)₂ into decimal and hexadecimal.    (2.5+2.5)

5. Subtract (1011.11 - 1010.10) using 2's and 1's complement.    (2.5+2.5)

6. Express the given function in sum of minterms.

        F = y'z + wxy' + wzx' + w'x'z'

7. Simplify the Boolean function using don't care conditions d, in sum of products and product of sums form.        (2.5+2.5)

        F(A, B, C, D) = π(0,1,3,7,8,12) and πd(5,10,13,14)

8. Implement a full subtractor with two half subtractor and one OR Gate.

9. Define SR latch with logic diagram and truth table.    (1+4)

10. Compare the logic of synchronous counter and ripple counter.    (2+3)

11. Define shift register with its types.

12. Write short notes on: (2x2.5=5)

    a) Parity generator

    b) State diagram