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B. Tech: Roll No

This document appears to be an exam for an Analog Integrated Circuits course, consisting of 5 sections with a total of 100 marks. It covers a wide range of topics related to operational amplifiers and other analog integrated circuits. Some of the key topics addressed include: - Differential amplifiers and calculating voltage gain, input resistance, and operating point values. - Current mirrors and their use in biasing. - The working of the op-amp 741 with a schematic diagram. - Transfer functions for circuits using multiple operational amplifiers. - Active filters including a second order Butterworth low pass filter. - Oscillator circuits and calculating the conditions and frequency of oscill

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Ravindra Kumar
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59 views5 pages

B. Tech: Roll No

This document appears to be an exam for an Analog Integrated Circuits course, consisting of 5 sections with a total of 100 marks. It covers a wide range of topics related to operational amplifiers and other analog integrated circuits. Some of the key topics addressed include: - Differential amplifiers and calculating voltage gain, input resistance, and operating point values. - Current mirrors and their use in biasing. - The working of the op-amp 741 with a schematic diagram. - Transfer functions for circuits using multiple operational amplifiers. - Active filters including a second order Butterworth low pass filter. - Oscillator circuits and calculating the conditions and frequency of oscill

Uploaded by

Ravindra Kumar
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/ 5

Roll No.

EC-502

No. of Printed Pages-5


B. TECH

FIFTH SEMESTER EXAMINATION, 2002-2003


ANALOG INTEGRATED CIRCUITS
Time :

'--"

3 Hours.

Total Marks : 100

Note: (1) Attempt ALL questions .


. (2) Make suitable assumptions wherever required
and justify.

1.

Answer any TWO of the following :(a)

(i)

(ii)

( 10 x 2 = 20 )

Define Common Mode Rejection Ratio


and explain its significance with respect
to differential amplifier.
For the circuit as shown in Fig. 1,
/3ac = /3dc = 100,

VBE = VOl =

0715 V,

Vz = 62 V,
IZt = 41 mA, calculate:
(a) voltage gain of differential amplifier,
(b) input resistance,
(c) operating point values ICQ and VCEQ'

VIn ""'-+

Fig. 1 -10 V

EC-502

Turn Over

(b)

(i)

Why are current


biasing?

mirrors

used

in

(ii)

In Fig. 2, a transistor array CA3086 is


and Pdc = Pac = 100 and VBE= 07l5Y,

lHrl

find collector current of each transistor.

-10 V
Fig. 2
(c)

2.

Explain the working of op-amp 741 schematic


diagram with a neat sketch.

Answer any TWO of the following :Find

V02

V' V
VOl

(a)

In

In

(lOx2=20)

VQ3

and

In

for Fig. 3 in terms

of circuit parameters. Also explain, what these


transfer functions represent. Assume all
operational amplifiers to be ideal.
R6

VOl

V02

Fig. 3
EC-502

(b)

(i)

Explain the working of the following


with neat diagrams :(1) Non-inverting VCVS
(2) CCVS

(ii)

(c)

Design a second order Butterworth


active low pass filter for a cut-off
frequency of 10 kHz.

Consider Fig. 4 and ideal op-amp.


(i)

Compute condition of oscillation.

(ii)

Find the frequency of oscillation.


Rl

R2

Fig. 4
3.

Answer any FOUR of the following :-

(5x4=20)

(a)

Derive the output expression of Logamplifier using op-amp as active device.

(b)

Draw Sample and Hold circuit using op-amp


and explain its working.

(c)

Explain how a Schmitt trigger works with a


neat diagram.

(d)

Draw and explain the circuit of square and


triangle wave generator using op-amp and
also draw the waveforms at various nodes of
the circuit diagram.

EC-S02

Turn Over

(e)

Draw and explain the working


of
Monostable Multivibrator using op-amp.

if)

Draw the circuit of a precision rectifier an.d


explain its working.

Answer any FOUR of the following :-

4.

(a)

(b)

(c)
(d)
(e)

(5x4=20)

What is the function of a voltage regulator? .


Draw the op-amp voltage regulator circuit
and explain its working.
Explain with neat sketch, the current limiting
features of 723 voltage regulator.
Draw the block diagram of SMPS and
explain its working.
Explain the current fold back characteristics
with respect to 723.
List the characteristics of an Operational
Transconductance Amplifier (OTA).Draw the
inverting and non-inverting amplifiers using
OTA.
<

if)

Find the input impedance of circuit as


shown in Fig. 5.

Fig. 5
5.

Answer any TWO of the following :(a)

Explain the block diagram of 555. Derive the


expression for time delay of a monostable
multivibrator using 555.

EC

EC-502

(10x2=20)

(b)

(c)

(i)

Explain Lock-in Range, Capture Range


and Pull-in-time of a PLL.

(ii)

Draw the block diagram of a PLL and


explain its working.

(iii)

List the applications of PLL.

(i)

Write note on Programmable


Amplifier.

(ii)

Enlist the applications of Analog


Switches. Select one application and
explain its working with a neat sketch
of the circuit.

Gain

EC-502

'r

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