Hall Ticket No Question Paper Code: AEC004
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Supplementary) July, 2018
Regulation: IARE R16
ELECTRONIC CIRCUIT ANALYSIS
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Design an emitter follower having Ri= 600 k Ro=10 Ω Assume hfe=150, hie =1K
hoe=25
. Find AI AV for the emitter follower using h-parameters.
Define parameters of CE configuration from the input and output characteristics.
2. Derive the expression for voltage gain, input and output impedance of a common emitter configuration
with neat circuit diagram.
Discuss the importance of Miller's theorem in analyzing the amplifiers.
UNIT II
3. Draw the high frequency small circuit of emitter follower amplifier and derive an expression for
upper corner frequency.
Derive an expression for short circuit current gain of a transistor with the help of hybrid- model.

4. It is required to find the midband gain and the upper 3dB frequency of the common emitter
amplifier shown in Figure with Rsig=5K
RB=100K
RC=8K
RL=5K
VCC= VEE
DC current I=1mA at which 0=100,
fT =800MHz, C=1pF.
Figure 1
Determine the 3dB frequency of the short circuit current gain of a bipolar transistor, given
r=2.6K
C=2PF C=0.1pF.
Page 1 of 2
UNIT III
5. Write a short note on transformer coupling, direct coupling schemes used in multistage amplifiers.

Draw the circuit diagram of Cascoded amplifier and derive the h-parameters of it?
6. Draw the circuit diagram of darlington configuration and derive the expressions for input, output
impedance, voltage and current gains?
Calculate overall cut off frequency of 5 stage cascaded amplifiers having single stage lower cut off
frequency of 5k Hz.
UNIT IV
7. With the help of equivalent circuit, derive the expression for input and output resistance of
current series feedback amplifier.
An amplifier with a closed loop gain of 200 is required this gain should not vary more than
when the inherent gain of the amplifier without feedback varies by 20%. Find the values of
Av .
8. Explain how oscillators are classified and conditions for oscillations.
Write short notes on
i. Colpitts Hartley Oscillator
ii. RC phase shift Oscillator
UNIT V
9. Explain the operation of class B push pull amplifier and also derive the expression for maximum
conversion efficiency.
A single stage class A amplifier has VCC=20V, VCEQ=10V, ICQ=600mA and collector load
resistor RL=16
. The ac output current varies by 300mA with the ac input signal. Determine
i. The power supplied by the dc source to the amplifier circuit.
ii. DC power consumed by the load resistor
iii. AC power developed across the load resistor
iv. DC power delivered to the transistor
v. DC power wasted in transistor collector
vi. Overall efficiency
10. Explain the operation of transformer coupled class A amplifier derive the maximum conversion
efficiency.
With a neat diagram, explain the classification of power amplifiers based on location of Q-points.