Question Paper: Digital Electronics : Question Paper Dec 2012 - Electronics & Telecomm. (Semester 3) | Mumbai University (MU)
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Digital Electronics - Dec 2012

Electronics & Telecomm. (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.
1 (a) Perform the following operations :
(i) 1010.1 × 101.1
(ii) (AA)H × (55)H
(iii) Convert (77)8 into Decimal number system
(iv) Find (22.31)10 using 2's complement number system
(v) Convert (1110101100000111)2 into Hexa-decimal number system
(10 marks)
1 (b) Draw state diagram of sequence detector to detect a non-overlapping sequence 10001. write its state table. Find the equivalent state if they are present (10 marks) 2 (a) Design lockout free Mod 13 up synchronous counter using JKMS flip flops.(10 marks) 2 (b) Do the following conversion of flip flops :
(i) JKMS to T (ii) D to T
(10 marks)
3 (a) Draw CMOS inverter circuit, discuss its operations and draw its transfer characteristics.(10 marks) 3 (b) For the following function implement the SOP and POS circuit
F(A,B,C,D)=?m (2,3,5,7)+?d(6,13,14,15)
(10 marks)
4 (a) For the following function find the reduced Boolean equations using Quine McClusky method;
F(A,B,C,D)=?m(1,3,4,6,9,11,12)+?d(5,8,15)
(10 marks)
4 (b) Draw JKMS flip flop and explain its operation(10 marks) 5 (a) Design full adder using decoder with active high output(10 marks) 5 (b) Explain following characteristics of logic families;
(i) Propagation delay (ii) Noise margin (iii) Current parameters (iv) Temperature range (v) Fan out
(10 marks)
6 (a) Design a PROM which will convert BCD numbers into Gray code(10 marks) 6 (b) Use 5 Input, 3 Product, 4 Output PAL to realize followinng 3 functions.
F1(A,B,C,D)=?m(2,3,4,8,913,14)
F2(A,B,C,D)=?m(2,3,5,8,9,14,15)
F3(A,B,C,D)=?m(2,3,4,8,9,14,15)
(10 marks)


Write short notes on any four of the following

7 (a) FPGA(5 marks) 7 (b) Asynchronous counters(5 marks) 7 (c) ECL logig family(5 marks) 7 (d) Weighted and non-weighted codes(5 marks) 7 (e) ROM(5 marks)

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