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Previous Year Question Paper

CSIT-304 - Digital Circuits & System (DSC)

June 2023•CSIT•SEMESTER-3
June 2023
Max Marks: 70
Duration: 3 Hours
Instructions:

• Attempt any five questions.

• All questions carry equal marks.

Q.1
a)Unit 1

Convert the following:

i) (B2F8)₁₆ = (?)₈

ii) (113.2)₈ = (?)₂

iii) (01000111)₂ = (.........)Gray

iv) (249)₁₀ = (.........)BCD

v) (A2B.1A)₁₆ = (?)₁₀

b)Unit 1

Convert the following expression into sum of product and product of sums. X' + X(X + Y')(Y' + Z)

Q.2
a)Unit 1

What do you mean by logic gates? Describe the various types of gates.

b)Unit 2

What do you understand by Adder Circuit? Design and Implement Full Adder using Two half adder and OR Gate.

Q.3
a)Unit 2

Draw and explain the BCD adder circuit. alt=''

b)Unit 2

Realize the function f(A, B, C, D) = π(1, 4, 6, 10, 14) + d(0, 8, 11, 15) using:

i) 16:1 MUX

ii) 8:1 MUX

Q.4
a)Unit 3

What is meant by 'edge triggered'? Differentiate SR-FF and JK-FF with their functional operation and excitation tables.

b)Unit 3

Describe the 4-bit universal shift register with a neat diagram. alt=''

Q.5
a)Unit 3

Design a 4-bit up/down Synchronous binary counter. Explain with a neat timing diagram. alt=''

b)Unit 4

Explain the principle working of sample and hold circuit.

Q.6
a)Unit 4

An n-bit Analog to digital converter (ADC) is required to convert an analog input in the range 0-5 V dc to an accuracy of 5mV. Find the value of n.

b)Unit 4

With the help of circuit diagram explain the working of V-F converters. alt=''

Q.7
a)Unit 5

With the help of Block diagram explain the working of BPSK modulation scheme. alt=''

b)Unit 5

What do you understand by Multiplexing? Explain the working principle of Time Division Multiplexing with suitable diagram. alt=''

Q.8
i)Unit 4

Schmitt trigger

ii)Unit 2

PLA

iii)Unit 2

Look ahead carry generator

iv)Unit 1

Karnaugh Map