LIC QUESTION BANK

Linear Integrated
Circuits and
Applications (LIC)–
Important Questions
LIC QUESTION BANK
Regulation :2008 (Anna university)
Subject Code : EC1260
Subject Name : Linear integrated
circuits & applications
Class & Sem. : II Year/IV Sem.
UNIT-I- IC FABRICATION
PART-A
1. Define an Integrated circuit.
2. What are the basic processes
involved in fabricating ICs using
planar Technology?
3. List out the steps used in the
preparation of Si – wafers.
4. Write the basic chemical reaction in
the epitaxial growth process of pure
silicon. The basic chemical reaction in
the epitaxial growth process of pure
silicon is the hydrogen reduction of
silicon tetrachloride.
5. What are the two important
properties of SiO2?
6. Explain the process of oxidation.
7. What is meant by molecular beam
epitaxy (MBE)?
8. What are the advantages of
Molecular Beam Epitaxy (MBE)?
9. What are oxidation induced defects
in semi conductor?
10 What is bird’s beak?
11. What are isotropic & anisotropic
etching processes?
12. Define diffusion.
13. What is dielectric isolation?
14. What are the advantages of ion
implantation technique?
15. What is metallization?

PART-B

1. With neat diagram explain the steps
involved in the fabrication of the
circuit shown in figure using IC
technology. (16)

2. Explain in detail about monolithic
IC technology. (16)

3. Write notes on
(i) Epitaxial growth
(ii) Masking & Etching Process (16)

4. Explain how a monolithic capacitor
can be fabricated. (16)

5. Explain how a monolithic diode can
be fabricated (16)

UNIT-II- CHARACTERISTICS OF OP-
AMP
PART-A
1.What are the advantages of ICs over
discrete circuits.?
2. What is OPAMP?
3. Draw the pin configuration of
IC741.
4. List out the ideal characteristics of
OPAMP?
5. What are the different kinds of
packages of IC741?
6. What are the assumptions made
from ideal opamp characteristics?
7. Mention some of the linear
applications of op – amps:
8. Mention some of the non – linear
applications of op-amps:-
9. What are the areas of application of
non-linear op- amp circuits?
10. What happens when the common
terminal of V+ and V- sources is not
grounded?
11. Define input offset voltage.
12. Define input offset current. State
the reasons for the offset currents at
the input of the op-amp.
13. Define CMRR of an op-amp.
14. In practical op-amps, what is the
effect of high frequency on its
performance?
15. What is the need for frequency
compensation in practical op-amps?
16. Define slew rate.
17. Why IC 741 is not used for high
frequency applications?
18. What causes slew rate?
19. Define thermal drift.
20. Define supply voltage rejection
ratio (SVRR)

PART-B

1. Explain in detail of a basic
differential amplifier. (16)

2. Draw the circuit diagram of op-amp
differentiator, integrator and derive an
expression for the output in terms of
the input. (16)

3. Explain in detail about voltage
series feedback amplifier. (16)

4. Derive the gain of inverting and
non-inverting. (16)

5. Explain and derive the condition for
DC-characteristics of an operational
amplifier. (16)

UNIT III- APPLICATIONS OF OP AMP
PART A
1. What is the need for an
instrumentation amplifier?
2. List the features of instrumentation
amplifier:
3. What is a comparator?
4. What are the applications of
comparator?
5. What is a Schmitt trigger?
6. What is a multivibrator?
7. What do you mean by monostable
multivibrator?
8. What is an astable multivibrator?
9. What is a bistable multivibrator?
10. What are the requirements for
producing sustained feedback
circuits?
11. What are the different types of
filters?
12. List the broad classification of
ADCs.
13. List out the direct type ADCs.
14. What is a sample and hold circuit?
Where it is used?
15. Define sample period and hold
period.

PART-B

1. Explain the working of an
instrumentation amplifier with a
circuit. Give its
characteristics and applications (16)

2. Explain the working of any one of
sinusoidal oscillators. (16)

3. Explain the working of schmit
trigger. (16)

4. Explain the R-2R ladder type DAC.
(16)

5. Explain how a comparator can be
used as a zero crossing detector.(16)

6. Draw the circuit of a first order and
second order butter worth active low
pass filter and
derive its transfer functions. (16)

UNIT IV-SPECIAL ICS
PART-A
1. What are the applications of 555
Timer?
2. List the applications of 555 timer in
monostable mode of operation:
3. List the applications of 555 timer in
Astable mode of operation:
4. Define 555 IC?
5. List the basic blocks of IC 555
timer?
6. List the features of 555 Timer?
7. Define duty cycle?
8. Define VCO.
9. What do u mean by PLL?
10. Define lock range.
11. Define capture range.
12. Define pull-in time.
13. List the applications of 565 PLL.
14. What are the two types of analog
multiplier Ics?
15. What is ICAD 533?
16. List the features of ICAD533.

PART-B

1. Explain the functional block
diagram of 555timer. (16)

2. Explain working of PLL using
suppropriate block diagram and
explain any one application of the
same. (16)

3. Draw the block diagram of an
Astable multivibrator using 555timer
and derive an expression for its
frequency of oscillation. (16)

4. Draw the block diagram of
monostable multivibrator using
555timer and derive an expression for
its frequency of oscillation. (16)

5. write short notes on i) capture
range
ii) Lock in range iii) Pull in time

UNIT V- APPLICATION OF ICS
PART-A
1. What is a voltage regulator?
2. Give the classification of voltage
regulators:
3. What is a linear voltage regulator?
4. What is a switching regulator?
9. Define line regulation.
10. Define load regulation.
11. What is meant by current limiting?
12. Give the drawbacks of linear
regulators:
13. What is the advantage of switching
regulators?
14. What is an opto-coupler IC?
15. What are the types of
optocouplers?
16. Give two examples of IC
optocouplers?
17. Mention the advantages of opto-
couplers:
18. Mention the advantages of opto-
couplers:
19. What is an isolation amplifier?
20. What are the features of isolation
amplifier?
21. What is LM380?
22. What are the features of
MA78s40?
1. Explain
i) Oscillation amplifier.
ii) Voltage regulator (16)

PART-B

2. Draw and explain the functional
block diagram of a 723 regulator. (16)

3. Draw the block diagram of the
function generator in IC 8038 (or) any
other equivalent
and explain its operation. (16)

4. Write an explanatory note on opto-
couplers. (16)

5. Explain in detail about the 380
power amplifier. (16)