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C1150 Pages 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: EC207
Course Name: LOGIC CIRCUIT DESIGN (EC, AE)

PARTA
Answer any two full questions, each carries 15 marks.

Convert the following numbers:
(a) (101111.1101)2todecimal (0) (63.625)10 to binary

What is the specialty of Grey code and specify how this property can be utilized in
a practical application

State the relationship between error detection ability, error correction ability and

minimum distance of a code. An 8421 code is transmitted as Hamming code with

even parity and the code received is 0011101. Determine the single error if any

and correct it

Obtain the minimal SOP expression for 2: m(2,3,5,7,9,1 1,12,13,14,15) and
implement it using NAND logic

Using K-map, obtain the minimal sum of product of the following expression

ABCD+AB'C'D'+AB'C+AB

Obtain binary representation of (-25) in (i) sign-magnitude (14) 1’s complement

(iii) 2’s complement form

Derive expressions for the output of a 1-01! magnitude comparator and implement
it using gates
PART B

Answer any two full questions, each carries 15 marks.
Differentiate between PLA and PAL with necessary diagrams
What is the significance of (a) propagation delay (b) power dissipation (c) Fan-out
of gates. Compare CMOS, ECL and TTL logic families in terms of these
parameters
What is race-around condition in flip-flops? How is it solved?

Design a mod-6 synchronous counter using T-flip-flops

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Duration: 3 Hours

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