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B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2010

Fourth Semester

Electrical and Electronics Engineering

EE2254 — LINEAR INTEGRATED CIRCUITS AND APPLICATIONS

(Regulation 2008)

(Common to Instrumentation and Control Engineering and Electronics and

Instrumentation Engineering)

Time: Three hours Maximum: 100 Marks

Answer ALL Questions

PART A — (10 × 2 = 20 Marks)

1. What is the purpose of oxidation process in IC fabrication?

2. What is parasitic capacitance?

3. List any four characteristics of an ideal OP-Amp.

4. Design an amplifier with a gain of –10 and input resistance of 10 k .

5. Define slew rate and state its significance.

6. An 8 bit DAC has a resolution of 20mV/bit. What is the analog output voltage

for the digital input code 00010110 (the MSB is the left most bit)?

7. Draw the pin diagram of IC 555 timer.

8. Mention any two application of multiplier IC.

9. List the important parts of regulated power supply.

10. What are the advantages of switch mode power supplies?

PART B — (5 × 16 = 80 Marks)

11. (a) Explain the basic processes used in silicon planar technology with neat diagram.

Or

(b) Discuss the various methods used for fabricating IC resistors and compare their

performance.

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12. (a) (i) Explain the functions of all the basic building blocks of an Op-Amp.(8)

(ii) Explain the application of OPAMP as (1) integrator (2) differentiator. (8)

Or

(b) Find 0V of the following circuit.

13. (a) Design and explain triangular wave generator using Schmitt trigger and integrator

circuit.

Or

(b) (i) Explain the operation of dual slope ADC. (8)

(ii) Explain the following characteristics of ADC resolution, accuracy, settling time, linearity.

(8)

14. (a) With neat block diagram, explain IC566 VCO operation and discuss any two

applications.

Or

(b) What are the modes of operation of IC555? Derive the expression of time delay of a

monostable multivibrator.

15. (a) With a neat diagram, explain working principle of switch mode lower supply.

Or

(b) Write brief notes on:

(i) IC MA 78 40

(ii) Optocoupler.

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Reg. No. :

Question Paper Code: 11366

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER /DECEMBER 2012

Fourth Semester



(Regulation 2008)





PART A — (10 × 2 = 20 Marks)

1. What is ion implantation? Give its advantages.

2. Why inductors are difficult to fabricate in integrated circuits?

3. Design a subtractor using op-amp.

4. Define CMRR.

5. What are the applications of peak detector?

6. Why active filters are preferred?

7. In a astable multivibrator using 555 timer RA =6.8 kΩ, RB =3.3 kΩ,C=0.1 μF.

Calculate the free running frequency.

8. Why Vco is called voltage to frequency converter?

9. What is an isolation amplifier?

10. Name the various protection circuits used for voltage regulators.

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PART B — (5 × 16 = 80 Marks)

11. (a) Explain the basic processes used in the fabrication of monolithic IC.

Or

(b) Explain the fabrication of n-channel JFET with necessary diagrams.

12. (a) (i) What are ideal Op-Amp characteristics? (6)

(ii) With a neat circuit diagram explain the operation of a Op-Amp

differentiator and derive an expression for the output of a practical

differentiator. (10)

Or

(b) Explain the different frequency compensation techniques of Op-Amp. (16)

13. (a) (i) Explain the working principle of successive approximation type ADC.

(12) (ii) Explain the any four specification of data converters. (4)

Or

(b) Explain with neat circuit diagram any one sine wave oscillator using Op-

Amp and derive expression for frequency of oscillation and gain of Op-Amp.

14. (a) Draw the functional diagram of IC 555 Timer in astable mode and explain its

operation and derive expression for frequency. Or

(b) Explain with a schematic how a PLL can be used as

(i) frequency multiplier. (8) (ii) frequency translator. (8)

15. (a) Draw and explain the function block diagram of a 723 IC regulator and make

the necessary changes to make it as low voltage regulator.

Or

(b) Write short notes on:

(i) Opto couplers. (8)

(ii) Switching regulators (8)

————————

2 11366

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B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010

Fourth Semester


EE 2254 — LINEAR INTEGRATED CIRCUITS AND APPLICATIONS



(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A — (10 × 2 = 20 Marks)

1. Give the difference between monolithic and hybrid ICs.

2. What is lithography?

3. Give the ideal characteristics of operational amplifier and give its equivalent

circuit.

4. Draw the circuit diagram of an integrator and give its output equation.

5. Draw the circuit diagram of an op-amp based positive clipper.

6. Which is the fastest ADC and why?

7. List the applications of NE 565.

8. Draw the relation between the capture range and lock range relationship in a PLL.

9. How will you increase the output of a general purpose op-amp?

10. Using LM380 draw the circuit for audio power amplifier.

PART B — (5 × 16 = 80 Marks)

11. (a) (i) Briefly explain the various types of IC packages. Mention the

criteria for selecting an IC package. (8)

(ii) Write short notes on classification of Integrated circuits. (8)

Or

(b) With respect to the BJT based circuit given below, explain the various



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steps to implement the circuit into a monolithic IC. (16)

12. (a) (i) With neat diagrams explain the types of feedback configurations

available. (8)

(ii) Briefly explain summing amplifier. Draw an adder circuit for the

given expression ) 5 1 . 0 ( 3 2 1

V V V V

o + + − = . (8)

Or

(b) Briefly explain the frequency response of op-amp. Give the frequency

compensation techniques adopted in operational amplifiers. (16)

13. (a) (i) Explain the first order lowpass Butterworth filter with a neat

circuit diagram. Derive its frequency response and plot the same. (8)

(ii) Design a lowpass filter with a cutoff frequency of 1 kHz and with a

passband gain of 2. (8)

Or

(b) What is an instrumentation amplifier? Give the important features of an

instrumentation amplifier. Explain the working of three op-amp

instrumentation amplifier. Give its application. (16)

14. (a) (i) Explain the Voltage Controlled Oscillator with a neat block

diagram. Give its typical connection diagram and its output

waveforms. (8)

(ii) Derive the expression for capture range for PLL where a simple

RC network is used as a LPF. (8)

Or

(b) Draw the functional diagram of IC 555 Timer. Explain with a circuit

diagram how it can be connected for monostable operation. (16)

15. (a) (i) Explain the working of series voltage regulator. (8)



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(ii) Write a note on optocouplers. (8)

Or

(b) What is a switching regulator? With a neat block diagram explain the

internals of A µ 7840. (16)



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B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011. Fourth Semester

Electrical and Electronics Engineering EE 2254 — LINEAR INTEGRATED CIRCUITS AND APPLICATIONS

(Common to Instrumentation & Control Engineering and Electronics & Instrumentation Engineering)

(Regulation 2008) Time : Three hours Maximum : 100 marks

Answer ALL questions. PART A — (10 × 2 = 20 marks)

1. List the basic processes used in IC Fabrication.

2. What is meant by ion implantation?

3. What is thermal drift?

4. Define Input offset voltage.

5. Draw the circuit of first order active filter.

6. Draw the circuit diagram of sample and hold circuit.

7. Define capture range of PLL.

8. What are one, two and four quadrant multipliers?

9. What are the disadvantages of linear voltage regulators?

10. What is isolation amplifier?

PART B — (5 × 16 = 80 marks)

11. (a) (i) Explain the process of epitaxial growth in IC fabrication process with neat diagrams. (8)

(ii) With neat sketches explain the fabrication of diodes. (8)

Or

(b) (i) Explain the different isolation techniques. (8)

(ii) Describe in detail about the diffusion process of IC fabrication.(8)

12. (a) Explain in detail about the frequency compensation applied to operational amplifiers. (16)

Or

(b) Draw and explain the working of operational amplifier as

(i) Integrator. (8)



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(ii) Differentiator. (8)

13. (a) Explain the following applications of operational amplifiers.

(i) Voltage to current converter. (8)

(ii) Clamper. (8)

Or

(b) Explain in detail the working of

(i) Weighted resistor type DAC. (8)

(ii) Dual slope type ADC. (8)

14. (a) (i) Explain the working of voltage controlled oscillators. (8)

(ii) What is PLL? Explain its application as frequency multiplier. (8)

Or

(b) Explain the astable and bistable operation of IC 555 with necessarywaveforms. (16)

15. (a) Draw and explain the application of IC 723 as low voltage regulator and high voltage

regulator. (16)

Or

(b) (i) Explain the block diagram of ICL 8038 function generator IC. (8)

(ii) Write short notes on opto couplers. (8)


B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2012

Fourth Semester



(Regulation 2008)

(Common to Instrumentation and Control Engineering and Electronics

and




PART A — (10 × 2 = 20 Marks)

1. What is the significance of using buried layer?

2. What are the advantages of polysilicon gate MOSFET over aluminium gate?

3. List any four non ideal dc characteristics of opamp.

4. Draw a subtractor using op-amp.

5. Draw the circuit of I -V converter using op-amp.

6. Define Monotonicity with respect to Data converters.

7. In what way VCO is different from other oscillators.

8. Mention any two applications of 555 Timer in Monostable mode.

9. Why do switching regulators have better efficiency then series regulators?

10. What is an optocoupler?

PART B — (5 × 16 = 80 Marks)

11. (a) Explain in detail the fabrication process of passive component in

Integrated

Circuits.

Or

(b) With necessary diagrams explain the fabrications of MOSFET.

12. (a) Draw the circuit of a symmetrical emitter coupled differential amplifier

and

derive for CMRR .

Or

(b) Show with the help of ci rcuit diagram an op-amp used as

(i) Summer . (8)

(ii) Integrator and explain their operation. (8)

13. (a) Explain the working principle of RC phase shift sine wave generator

using

op-amp and derive the expression for ‘ f’ .

Or

(b) (i) With an example and diagram explain the working principle of

Successive

approximation type ADC. (12)

(ii) Explain the important DAC specifications. (4)

Or

14. (a) Design and draw the waveforms of 1KHZ Square waveform generator

using 555

Timer for duty cycle.

(i) D=25% . (8)

(ii) D=50% (8)

Or

(b) (i) Perform the closed loop analysis of PLL. (8)

(ii) Explain any two applications of PLL. (8)

15. (a) Draw and explain the fundamental block diagram of a 723 voltage

regulator

and how this IC can be used as High voltage regulator.

Or

(b) Write an explanatory note on :

(i) Power amplifier.

(ii) Isolation amplifiers.

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