LINEAR
INTEGRATED CIRCUITS and Applications (LICA) - Important Questions
UNIT-I
1. Explain the
process of fabricating Resistor, capacitor, diode & FET.
2. Discuss in
detail about masking
3. Write short
notes on etching
4. Explain in
detail about diffusion process
5. Explain the
various processes involved in the preparation of silicon wafer
6. With a neat
sketch explain epitaxial grouth
7. Explain the
various steps involved in the fabrication of a typical monolithic IC
UNIT
-II
1. List out the
characteristic of ideal op amp
2. Discuss the dc
characteristic of an op amp (Input bias current ,Input offset current)
3. Explain the ac
characteristic of an op amp
4. Explain in
detail about the voltage series feedback amplifer
5. Explain in
detail about the operation of voltage shunt feedback amplifier
6. Explain the
operation of differential amplifier using op amp.
7. Explain the
frequency compensation techniques in detail.
8. Draw the circuit
of integrator and explain. Derive the expression for output voltage
9. Draw the circuit
of summing amplifier using opamp and explain
10. Draw the
circuit of differentiator and explain. Derive the expression for output
voltage
UNIT-III
1. Explain the
operation of Instrumentation amplifier
2. Write short
notes on clamper using opamp
3. With the help of
opamp how V/I conversion made and vice versa
4. Explain the
operation of positive & negative clipper circuit
5. Draw the sample
and hold circuit using opamp and explain its function
6. Explain the
working of regenerative comparator or Schmitt trigger
7. Explain the
applications of comparator
8. Draw and explain
the operation of a triangular wave generator and derive an
expression for its
frequency of oscillation.
9. Draw the circuit
of astable multivibrator and explain. Also derive the expressions
for the expression
the total time period ( using opamp)
10. Draw the
circuit of mono-stable multivibrator and explain. Also derive the
expressions for the
expression the total time period ( using opamp)
11. Explain the
working of a saw tooth waveform generator. Explain the methods to
obtain asymmetric
square wave. (5 Marks)
12. With neat
sketches, explain the response of I order active Low Pass Filter.
Derive an
expression for the critical frequency. (5 Marks)
13. With neat
sketches, explain the response of II order active Low Pass Filter.
Derive an
expression for the critical frequency.
14. With neat
sketches, explain the response of I order High Pass Filter. Derive an
expression for the
critical frequency. (5 Marks)
15. With neat
sketches, explain the response of II order High Pass Filter. Derive an
expression for the
critical frequency.
16. What output
voltage would be produced by a DAC whose output range is 0 to 10
V and whose input
binary number is 1011 1101 (for a 8 bit DAC)
17. With a neat sketch,
explain the operation of R-2R ladder DAC.
18. With a neat
sketch, explain the operation of weighted resistor DAC.
19. With a neat
sketch, explain flash type ADC.
20. With a neat
sketch, explain Dual slope type ADC.
21. With a neat
sketch, explain successive approximation ADC.
UNIT-IV
1. Explain the
operation of 555 timer IC in monostable mode. And explain any one
application in this
mode
2. Draw &
explain the functional diagram of 555 timers.
3. With neat
sketches of circuit diagram and waveforms, explain the operation of
555 Timer wired as
an astable multivibrator.
4. Discuss any 2
applications of astable multivibrator using 555 Timer in detail.
5. Discuss any 2
applications of monostable multivibrator using 555 Timer in detail.
6. Draw the basic
block schematic of PLL IC & explain. And define the trems lock- inrange,
capture range &
pull – in time.
7. Explain the
operation of VCO with respective block diagram
8. Explain any 2
application of PLL
UNIT-V
1. Draw the
functional diagram for a low voltage regulator using 723 IC & explain.
2. Design an
adjustable voltage regulator ( 3 volts to 28 volts) with a short circuit limit
of 60mA using a 723
regulator
3. Explain the
working of LM 317 IC.
4. Discuss about
the operation of MA 7840 IC
5. Draw the functional
diagram of ICL 8038 function generator IC
6. Draw the
schematic diagram of LM 380 power amplifier and explain. And explain
its application as
an audio power amplifier
7. Explain about
the operation of Isolation amplifier
8. Write short notes on opto coupler
& opto electronic IC