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4809 Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: EE204
Course Name: DIGITAL ELECTRONICS AND LOGIC DESIGN (EE)

PART A
Answer all questions, each carries 5 marks

Convert the following binary number into its equivalent gray code:
11010101
Convert the following gray code into its binary: 10101110
Perform the following arithmetic operation using 2’s complement
representation: 58 — 34
Sensors are used to monitor the pressure and temperature of a chemical solution
stored in a tank. The circuitry for each sensor produces a high voltage when a
specified maximum value is exceeded. An alarm requiring a low voltage input
must be activated when either the pressure or temperature is excessive. Design a
circuit for this application.
Draw the circuit of a full adder and explain.
Distinguish between Sequential and combinational circuits.
Explain the design procedure of a synchronous counter without lock out.
Differentiate Moore and Mealy machines. Explain with examples.
Give the basic operation of a successive approximation ADC
Compare PAL, PLA and FPGA.

PART 8
Answer any two questions, each carries 10 marks

Find the standard sum of products (SOP) for the logic expression:

F (A, 8, C, D) = 45 + ABD+ BCD
Use K-map to minimize the expression:
F (A, 3, C, D) 5» m (0, 1, 2, 3, 4, 9, 10, 12, 13, 14, 15)
Design a three-bit odd parity detector circuit.
Design the logic circuit for a BCD to decimal decoder.
Draw a neat diagram of TTL NAND gate and explain its operation. What is
meant by sourcing and sinking?

PART C
Answer any two questions, each carries 10 marks
Explain the operation of a Master slave JK flip-flop. What is meant by race
around condition?

Design a 1306-11 asynchronous counter using T flip flops and discuss its
disadvantages.

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Duration: 3 Hours

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