Question Paper: Digital Electronics : Question Paper Dec 2014 - Electronics & Telecomm (Semester 3) | Pune University (PU)
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Digital Electronics - Dec 2014

Electronics & Telecom Engineering (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.


Answer any one question from Q1 and Q2

1 (a) State the following characteristics of Digital IC's (TTL):
(i) Fan in, Fan out
(ii) Noise Margin
(iii) Figure of Merit.
(6 marks)
1 (b) Implement the following functions using single 8 : 1 MUX:
f(A, B, C, D) = πM(0, 3, 5, 7, 12, 15) + d(2, 9).
(6 marks)
2 (a) Draw and explain the working of 2 input CMOS NOR gate.(6 marks) 2 (b) Design a 2-Bit magnitude comparator using suitable decoder.(6 marks)


Answer any one question from Q3 and Q4

3 (a) Design a mod-5 ripple counter using a 3-bit ripple counter.(6 marks) 3 (b) Explain:
(i) State Table
(ii) State Diagram
(iii) State Reduction
(6 marks)
4 (a) Design and explain the following terms:
(i) Mealy Machine
(ii) Moore Machine
(iii) State Table
(6 marks)
4 (b) Design a pulse train generator to generate the following sequence ----10110---- using shift register.(6 marks)


Answer any one question from Q5 and Q6

5 (a) Give comparison between PROM, PLA and PAL.(5 marks) 5 (b) A combinational circuit is defined by the following functions. Implement this circuit with PLA having 3 input, 4 product terms and 2 outputs:
F1 (A, B, C) = ∑m(0, 1, 3, 4)
F2 (A, B, C) = ∑m(1, 2, 3, 4, 5).
(8 marks)
6 (a) Explain in detail the architecture of FPGA.(6 marks) 6 (b) Design a BCD to excess 3 code converter and implement it using PAL.(7 marks)


Answer any one question from Q7 and Q8

7 (a) Write a VHDL code for 2-bit comparator using behavioural modelling style.(7 marks) 7 (b) Describe any two modelling styles of VHDL with suitable examples.(6 marks) 8 (a) Write a VHDL code for 4-bit ALU using case statement.(7 marks) 8 (b) Explain the following statements with examples:
i) Process
ii) Case
iii) Wait.
(6 marks)

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