Pondicherry University 2011 B.Tech Electronics and Communications Engineering , - Digital Circuits - Question Paper

PART A- (10*2=20 MARKS)

ans all ques..

1. Subtract (1 one 1 0 0 1) from (1 0 one 0 one 1) using 2's complement methods.

2. What is Checksum code?

3.State De Morgan's theorem.

4. elaborate called don't care conditions?

5. describe multiplexer?

6. provide the comparison ranging from PROM and PLA.

7. describe shift registers.

8. What is state table?

9. What is memory cycle?

10. What is Bipolar RAM cell?

PART B - (5*11=55 marks)

ans all questions, 1 from every unit.

UNIT I

11. (a) Convert i) (9B2 - 1A)h to its decimal equivalent.
ii) (22.64) to hexadecimal number.

(b) provide the 2 binary numbers X = 1010100 and Y = 1000011, perform the subtraction
i) X-Y and ii) Y-X using 1's complements.

or

12. Write short notes on Gray code and Hamming code.

UNIT II

13. Implement the Boolean function F(X,Y,Z) = (1,2,3,4,5,7) with NAND gates.

or

14. provide the general procedure for converting a Boolean expression in to multilevel NAND diagram with an example.

UNIT III

15. Design a BCD adder.

or

16. Implement the design of Multiplexer using logic gates.

UNIT IV

17. define the operation of Master-Slave JK flip-flop.

or

18. discuss in detail about serial in serial out shift register.

UNIT V

19. Draw a dynamic RAM cell and discuss its operation.

or

20. Write short notes on.
(a) Bipolar RAM cell.
(b) MOSFET RAM cell.

Earning:   Approval pending.