Anna
University, Chennai Nov/Dec 2012 Examinations

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Important Questions

EC2203 Digital
Electronics

III SEM ECE

Unit
I-V

1.
Simplify
the following Boolean function by using Quine –McCluskey method F(A,B,C,D) =
∑(0,2,3,6,7,8,10,12,13)

2.
Reduce
the following function using K-map technique F(A,B,C,D) = (0,3,4,7,8,10,12,14) + d( 2,6)

3.
Discuss
the general characteristics of TTL and CMOS logic families

4.
Minimize
the given terms πM ( 0,1,4,11,13,15) + πd (5,7,8) using Quine-McCluskey methods
and verify the results using K-Map methods.

5.
Explain
the operation of carry look ahead adder with neat diagram

6.
Design
a combinational circuit that generates the 9’s complement of a BCD digit

7.
Design
a excess 3 to BCD code convertor

8.
Realize
F(W,X,Y,Z) = ∑ m (1,4,6,7,8,9,10,11,15) using 4 to 1 MUX

9.
Explain
in detail the operation of 4 bit ripple counter

10.How will you convert
a D flip flop into JK flip flop

11.
Explain
the operation of universal shift register with neat block diagram

12.With a neat state
diagram and logic diagram ,design and explain the sequence of states of BCD
counter

13. Explain read and
write operation of memory with timing waveforms

14.A combinational
circuit is defined by functions F

_{1}(A,B,C) =∑ M(0,1,6,7)
F

_{2}(A,B,C) =∑ M(2,3,5,7)
Implement the circuit with a PLA
having three inputs , three product terms and two inputs

15. Design a
combinational circuit using a ROM .The circuit accepts a three bit number and
outputs a binary number equal to the square of the input number

16.Write short notes on
EPROM and EEPROM

17. Describe the hazards
that could occur in asynchronous sequential circuits. What are the ways in which
they are eliminated

18.Design negative edge
triggered T flip flop from logic gates

19.Write a verilog
coding for full adder

20Design
a serial adder using moore model and mealy model