This document contains questions for a question bank covering five units on integrated circuits and applications: Unit I covers the classification of integrated circuits and operational amplifiers, including ideal and practical op-amp characteristics, the op-amp 741 pin diagram and features, and op-amp modes of operation. Unit II discusses various op-amp applications including adders, subtractors, voltage followers, instrumentation amplifiers, and integrators and differentiators. It also covers comparators, Schmitt triggers, and multivibrators. Unit III is about active filters and oscillators, including first order filters, waveform generators, and phase locked loops. Unit IV describes timer ICs and applications using IC 555

1. I.RAVIKUMAR
LINEAR IC APPLICATIONS
Question Bank
Unit I: Integrated Circuits:
1. Explain the classification of ICs.
2. Explain the characteristics of an ideal OP-AMP and practical OP-AMP (All Definitions).
3. Draw the pin diagram of OP-AMP IC 741 and give its features.
4. Explain the different modes of operation of OP-AMP and derive the expressions of voltage gain/
output voltage. (Inverting Amplifier, Non-Inverting Amplifier, Differential Amplifier).
Unit II: OP-AMP Applications:
1. Briefly discuss the following applications of OP-AMP:
(i) Adder(Summing Amplifier)
(ii) Subtractor
(iii)Adder/ Subtractor
(iv) Voltage Follower
2. Describe the instrumentation amplifier with a neat sketch.
3. Explain the V to I and I to V converters.
4. Explain about sample and sold circuits.
5. Explain the operation and hence derive the expressions for output voltage of (i) Integrator (ii)
Differentiator using OP-AMPs.
6. Explain the following OP-AMP circuits:
(i) Comparators
(ii) Schmitt Trigger
(iii) Astable Multivibrators (Square Wave Generator)
(iv) Monostable Multivibrators (Pulse Generator)
7. Write short notes on 78XX and 79XX series fixed voltage regulator ICs.
8. List the features of voltage regulator IC 723.
Unit III: Active Filters & Oscillators:
1. What are active filters and passive filters? Compare them.
2. List the advantages and drawbacks of active filters.
3. Explain the operation of the following active filters:
(i) First Order Low Pass Filter
(ii) First Order High Pass Filter
(iii) Band Pass Filters
(iv) Band Reject Filters
(v) All Pass Filters
4. With a neat sketch explain the operation of the following waveform generators using OP-AMPs:
(i) RC Phase Shift Oscillator
(ii) Wien Bridge Oscillator
(iii) Quadrature type Oscillator
(iv) Triangular wave generators
(v) Saw tooth wave generators
Unit IV: Timers & Phase Locked Loops:
1. Draw the functional block diagram of IC 555 Timer and explain.
2. Explain the operation of the following multivibrators using IC 555 Timer:
(i) AMV (ii) MMV
3. Explain the operation of Schmitt trigger circuit using IC 555 Timer.
4. Draw the block diagram of PLL and explain.
5. Draw the block diagram of PLL IC 565 and explain.
6. Define (i) Lock in range, (ii) Capture range (iii) Pull in time of a PLL.
7. Explain the operation of VCO with the help of a block diagram.

2. I.RAVIKUMAR
Unit V: D/A & A/D Converters:
1. State the need for A/D and D/A converters.
2. Define the following terms with reference to DAC & ADC (Specifications):
(a) Accuracy (b) Resolution (c) Linearity (d) Settling Time (e) Monotonicity.
3. Explain the weighted resistor type DAC.
4. Explain the R-2R ladder type DAC.
5. Explain the counter type ADC.
6. Explain the successive approximation register type ADC.
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