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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
Course Code: CS207
Course Name: ELECTRONIC DEVICES AND CIRCUITS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries3 marks. Marks
1 Draw the circuit of a RC differentiator and write its design equation. Also (3)
draw its output waveform for a 1K Hz square wave input.
2 Compare the features of BJT with FET (3)
3 What is line regulation and load regulation? Explain with equation for (3)
percentage of regulation
4 Draw a sweep circuit with transistor acting as a switch. (3)
PART B
Answer any two full questions, each carries9 marks.
a) (6)
141
2 200
201% pp 400i
1 KHz

What is the function of above circuit? ,

What will happen:

(i) if polarity of diode is changed.

(ii) if a reference voltage of (-3 volts) is connected in series with the

diode.
(iii) Plot output wave forms in all cases.
b) Explain working of a voltage Tripler with the help of relevant circuit (3)
6 ച Give the necessity of Current fold back and current limit protection. (9)

Explain with circuit and graphs.
7 9) Draw the structure of depletion mode MOSFET and explain its operation (7)
with characteristics.
b) Distinguish between enhancement and depletion mode MOSFETs (2)

PART C
Answer all questions, each carries 3 marks.

8 Give the importance of biasing in transistors? Mention significance of (3)

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