MU Electronics Engineering (Semester 3)
Digital Circuits and Design
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain drawback of synchronous counter.
5 M
1 (b) Differentiate synchronous and asynchronous counter.
5 M
1 (c) Draw truth table and logical diagram of half adder.
5 M
1 (d) Explain Fan in, Fan out, power dissipation and noise immunity with reference to digital Ics.
5 M

2 (a) Design MOD 12 asynchronous counter using T flip flop.
10 M
2 (b) Discuss Xilinx XC 9500 CPLD architecture.
10 M

3 (a) Design MOD-60 counter using IC 74163.
10 M
3 (b) Analyze the sequential state machine shown in figure. Obtain state diagram for the same.

10 M

4 (a) Simplify following logic function and realize using NAND gate
(i) F=1:m (1, 2, 4, 7, 10, 11, 13)+ d(9, 15)
(ii) F=2:m (1, 2, 3, 5, 8, 9, 11, 13, 15) + d(6).
10 M
4 (b) Design a Mealy type sequence detector to detect a serial input sequence of 101.
10 M

5 (a) Draw a circuit diagram of two input TTL NAND gate and explain its operation.
10 M
5 (b) Design 4 bit Johnson counter using J-K Flip Flop. Explain it operation using waveform.
10 M

Write a short note on.
6 (a) Fault Model.
7 M
6 (b) Multiplexers
7 M
6 (c) Noise Margin.
7 M



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