Reg No.:

Max. Marks: 100

10
11

a)

b)
a)
b)

a)
b)

00000CS 207121903

Pages: 3

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Third semester B.Tech degree examinations (S) September 2020

Course Code: CS207
Course Name: ELECTRONIC DEVICES AND CIRCUITS

PARTA
Answer all questions, each carries 3 marks.

Draw a differentiator circuit and draw the input and output waveforms for
square wave input.
Draw the input and output waveforms of a sweep circuit using a transistor as
a switch. Sketch the relevant circuit diagram.
What are the different types of DC to DC converters.
Compare JFET with BJT.
PART B

Answer any two full questions, each carries 9 marks.
Assuming suitable values, design an integrator circuit for a 1 KHz square
wave. Draw the relevant waveforms and circuit with designed components.
Draw the circuit diagram of a three pin regulator for obtaining a 5V output.
Draw the circuit of a transistor shunt regulator and explain its working.
Design a circuit to convert a bipolar signal to a signal having value between
OV and above, without change in wave shape.
Draw the internal structure of IC723 and explain its working.

Draw the circuit of a voltage tripler and plot the waveforms.

PART C
Answer all questions, each carries 3 marks.
What is the significance of a load line in an amplifier?

Why are multistage amplifiers used? What are its drawbacks?
How does a crystal oscillator work? What are its advantages?
Draw the circuit of a RF tuneable oscillator and write the equation for

finding its frequency of operation.

Page 1 of 3

Duration: 3 Hours

Marks
(3)

(3)

(3)
(3)

(5)

(4)
(5)
(4)

(5)
(4)

(3)
(3)
(3)
(3)