1 (a)
Define rise time, fall time in a digital waveform. What is the value of highly duty cycle (duty cycle H) if the frequency of a digital waveform is 5 MHz and the width of the positive pulse is 0.05μs?

4 M

1 (b)
Realize the basic gates using only NAND gates.

6 M

1 (c)
What is positive and negative logic? List the equivalences in positive and negative logic.

4 M

1 (d)
Write a verilog HDL code using structural model for two input AND gate and prepare test-bench to simulate the circuit. Draw the timing diagram generated by simulating the verilog code. Assume 20 ns holding time of each input conbination.

6 M

2 (a)
Simplify the Boolean function F(A,B,C,D)=∑m(1,3,5,7,8,10,12,14) by using Karnaugh map method and realize the logic circuit using only NAND gates,

6 M

2 (b)
Draw Karnaugh map Y=F(A,B,C,D)=Πm(0,1,2,4,5,10)⋅ d(8,9,11,12,13,15) and get the simplified POS form of K-map.

4 M

2 (c)
Get simplified expression of Y=F(A,B,C,D)=∑m(2,3,7,9,11,13)⋅d(1,10,15) using Quine-McClusky method.

10 M

3 (a)
What is multiplexer? Design a 4-to-1 multiplexer using logic gates, write the truth table and explain its working principle.

6 M

3 (b)
Describe the working principle of 3:8 decoder. Design a circuit that relizes the following functions using a 3:8 decoder and multi-input OR gates.

F

F

F

_{1}(A, B, C)=∑m(1,3,7)F

_{2}(A, B, C)-∑m(2,3,5)
6 M

3 (c)
What is magnitude comparator? Design one bit comparator and write the truth table, logic circuit using basic gates,

6 M

3 (d)
How does Programmable Logic Arrays (PLA) differ from a Programmable Array Logic (PAL)?

2 M

4 (a)
With the help of neat diagram, explain the working of edge triggered JK flip-flop. Write the state diagram and excitation table.

6 M

4 (b)
What is switch contact bounce? Explain the working principle of a simple RS latch debounce circuit.

4 M

4 (c)
Write the state table and state diagram for the circuit shown in Fig.Q4(c).

10 M

5 (a)
What is a shift register? Draw the logic diagram of a 4 bit serial in serial out (SISO) shift register using negative edge triggered JK or D flip-flop and explain its operation with the waveform to shift the binary number 1010 into the register,

8 M

5 (b)
Explain with logic diagram the use of 8-bit SISO shift register in serial addition of two 8-bit numbers.

8 M

5 (c)
Write verilog HDL code for 4-bit SIPO shift register when all the flip-flop outputs are available externally.

4 M

6 (a)
What are asynchronous and synchronous counters? With a neat block diagram, output waveform and truth table, explain a 3-bit binary ripple counter constructed using negative edge triggered JK flip-flops.

10 M

6 (b)
Design a mod-5 counter using JK flip-flops having the feature that if an unused state appears, the counter will reset to 000 at the next clock pulse.

10 M

7 (a)
With neat block diagrams compare Mcaly model and Moore model of sequential logic system.

4 M

7 (b)
Draw the ASM chart for the Mcaly machine shown in fig.Q7(b).

8 M

7 (c)
Using row elimination method reduce the state diagram shown in fig.Q7(c).

8 M

8 (a)
What is the binary ladder? Explain the binary ladder with a digital input of 1000.

6 M

8 (b)
Defne Accuracy and Resolution with respect to DAC.

4 M

8 (c)
With a neat circuit diagram, explain parallel ADC.

10 M

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