E E3842

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

THIRD SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: CS207
Course Name: ELECTRONIC DEVICES AND CIRCUITS (CS)

Max. Marks: 100 Duration: 3 Hours

PART A
Answer all questions, each carries 3 marks

1 Draw the circuit diagram of a voltage tripler circuit and mark the polarity and value

of the voltages across each capacitor in the circuit.

2 For the given input waveform and circuit, draw the output waveform and the

transfer characteristics. Assume the cut-in voltage of the diode to be 0.6 V.

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3 What is line regulation and load regulation in the context of a voltage regulator.

4 Compare between FET and BJT.
PART B
Answer any two full questions, each carries 9 marks

5 2) Draw the circuit of an RC differentiator and explain how it differentiate a square

signal. Draw the input and output waveforms.

b) Design a good differentiator circuit for a square wave signal with Vpp = 10۷ and

frequency 10 KHz.
Also draw the input and the output waveforms.

6 With neat sketches, explain the construction, principle of operation, and

characteristics of anN-channel enhancement MOSFET.

7 Draw the circuit diagram of a transistorised series voltage regulator and explain
how regulation is achieved. Also improve this circuit by introducing over current

protection in it.

PART C
Answer all questions, each carries 3 marks
8 Name the three non-sinusoidal oscillators. Do any of them have memory? Justify
your answer.
9 What are the classification of amplifiers.
10 Explain the effect of negative feedback on the gain of the amplifier.
11 State and explain Barkhausen criteria for sustained oscillation.

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