கலை 0800F ET20512 003.
APJ ABDUL KALAM TE "೭1101 UNIVERSITY
Third Semester B.Tech Degree Examination December 2020 (2019 Scheme)

Course Code: EET205
Course Name: ANALOG ELECTRONICS

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions. Each question carries 3 marks Marks
1 State the functions of a transistor biasing circuit. (3)

1௮2

With the help of a circuit diagram and relevant equations show that fixed bias is (3)

not stable against temperature variations.

3 Draw and explain the frequency response characteristics of RC coupled (3)
amplifier.
4 With a neat diagram, explain the constructional features of n-channel JFET. (3)
5 What is Barkhausen’s criterion? Explain. (3)
6 Draw the circuit of crystal oscillator. (3)
7 List any six characteristics of an ideal operational amplifier. (3)
8 Derive the expression for the output voltage of a closed loop non-inverting (3)
amplifier using op-amp.
9 With neat circuit diagram and waveforms, explain zero crossing detector. (3)
10 Explain the operation of ideal integrator circuit using op-amp with circuit (3)
diagram.
PART B
Answer any one full question from each module. Each question carries 14 marks
Module 1

11 (a) Derive the expressions for current gain, input impedance, voltage gain and (10)
output impedance using complete /A-parameter equivalent circuit of CE
amplifier.

(b) Draw the collector to base bias circuit of transistor amplifier using the given (4)

values and determine the following. i) Ic ii) Vcr.

Given B=80, Rg=100kQ and Re=10kQ and Vec=15V
12 (8) For the circuit shown in figure, ४८20४, Rc=2kQ, 9550, Vpr=0.2V, (10)

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