Scribd
Upload
57 views1 page

#Indian Institute of Technology, Kharagpur: Answer The Questions

This document is a midterm exam for a class on analog electronic circuits taken by 251 students. It contains 5 questions related to circuit design and analysis of common transistor amplifier configurations. Question 1 asks students to calculate the overall voltage gain and component values for a circuit combining a signal generator, load resistor, and non-inverting amplifier. Question 2 asks students to design a common emitter amplifier with specific specifications and calculate its mid-frequency voltage gain. Question 3 asks students to draw the frequency response of a common source amplifier and label key points given component values and operating conditions. Question 4 asks students to draw a common base amplifier including biasing and derive its voltage gain and input resistance. Question 5 asks students to draw an emitter

Uploaded by

Indranil
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
57 views1 page

#Indian Institute of Technology, Kharagpur: Answer The Questions

This document is a midterm exam for a class on analog electronic circuits taken by 251 students. It contains 5 questions related to circuit design and analysis of common transistor amplifier configurations. Question 1 asks students to calculate the overall voltage gain and component values for a circuit combining a signal generator, load resistor, and non-inverting amplifier. Question 2 asks students to design a common emitter amplifier with specific specifications and calculate its mid-frequency voltage gain. Question 3 asks students to draw the frequency response of a common source amplifier and label key points given component values and operating conditions. Question 4 asks students to draw a common base amplifier including biasing and derive its voltage gain and input resistance. Question 5 asks students to draw an emitter

Uploaded by

Indranil
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 1

#INDIAN INSTITUTE OF TECHNOLOGY, KHARAGPUR

Date: 17 Feb 2012(AN)


Time: 2 Hrs. Full Marks: 30
No. ofStudents: 251
Mid Spring Semester 2011-2012
Department: E&ECE Subject No.: EC 21008/EC21010
B. Tech.
Subject Name: ANALOG ELECTRONIC CIRCUITS

Answer ALL the questions.


1. A signal generator generates 330 mVpp signal under unloaded condition. The voltage drops
down to 30 m VPP when a load RL is directly connected to the signal generator. When the same
signal generator is connected to the input of an amplifier having an inherent voltage gain of
100, input resistance of 1 KQ and output resistance of 225 Q, the voltage observed across the
same load RL (which is now connected to the output of the amplifier), to be 4 Vpp. Write the
expression of the overall voltage gain. Find out the probable values of the load resistance RL
and the source resistance rs of the signal generator.
(6)
2. Design a common emitter amplifier (without emitter resistor) to maximize the output swing for
an available power supply of 9 V, while maintaining a quiescent collector current of 3 rnA.
Assume P = 100, VsE(ON) = 0.6 V. Ignore VcE(SAT) for this calculation. Set the lower cutoff
frequency to be equal to 20 Hz. Draw the complete circuit along with the values of the
associated components. Calculate the mid-frequency voltage gain of your designed circuit.
(6)
3. Draw the frequency response of a common source amplifier clearly indicating the numerical
values of lower cutoff frequency, mid-frequency voltage gain and upper cutoff frequency, for
2
the following given device parameters and operating conditions: Vth = 1 V, K = 500 p.AIV , 'A.=
0, Cgs = 2 pF, Cgd = 2 pF. Assume a power supply voltage of 6 V, gate voltage set at 3 V by a
potential divider comprised of two 100 KQ resistor connected between gate and power supply
terminals. Source is directly connected to ground and drain is connected to the power supply
through a fixed resistance such that the drain voltage is 4 V. The amplifier is driven by a signal
source having a source resistance of 600 Q connected to the gate terminal via a 1 p.F capacitor.
(6)
4. Draw the circuit diagram of a common base amplifier including all the biasing arrangements
from a single power supply. Clearly identify the input and the output terminals. Draw the small
signal equivalent circuit and derive the expressions for its voltage gain and input resistance.
~ (6)
5. Draw the circuit diagram of an emitter follower using a p-n-p transistor. Draw he small signal
equivalent circuit. Derive the expression for input resistance of the circuit. Derive the
expression of output resistance of the emitter follower when it is driven by a signal source with
nonzero source resistance.
(6)
* *

You might also like