EE3402 Linear Integrated Circuits Important Questions

EE3402 Linear Integrated Circuits Important Questions

Unit 1

1. Summarize the steps involved in the N-well process in CMOS processing technology.
2. Discuss the ion implantation diffusion and metallization in silicon semiconductor technology.
3. Summarize the steps involved in the P-well process in CMOS processing technology.
4. Explain the classifications of ICs.
5. Explain the following processes in detail: Epitaxy, Masking and Etching.
6. Explain the IC packaging techniques.
7. Explain the steps used in fabrication of diodes.
8. Explain the epitaxial growth, masking, etching and diffusion techniques in IC fabrication process with neat sketch.
9. Explain the different types of IC capacitor fabrication technique.

Unit 2

1. Derive the gain of the non-inverting amplifier using Opamp.
2. Design an inverting amplifier with a gain of -5 and input resistance of 10 ΚΩ.
3. Design a practical differentiator circuit to differentiate signals from 500Hz to 1000 Hz. Assume the input capacitance of 0.1 µF, if the input signal is 0.4 sin 27 (1000)t volts. Express the output voltage.
4. Explain the methods used to avoid unstable condition in op-amp.
5. Draw and explain the AC characteristics of op-amp.
6. Explain the following applications of OPAMP:
   (i) Voltage to Current Converter
   (ii) Current to Voltage Converter
7. With neat sketch explain the adder-subtractor combinational circuit with neat sketch.
8. Describe the working of differentiator and integrator. Draw the outputs for the inputs, sine and square waves.

Unit 3

1. Design a second-order low-pass Butterworth filter with a cut-off frequency of 10 KHz and unity gain at low frequency. Also, determine the magnitude of the voltage transfer function in dB at 12 for the filter.
2. Using Opamp, discuss in detail the circuit to implement a logarithmic amplifier. Also, Illustrate how two analog voltages are multiplied using log-antilog amplifiers.
3. Explain the following applications of OPAMP:
   (i) Clippers
   (ii) Clampers
   (iii) S/H circuit
4. With aid of neat diagram briefly explain.
   (i) Weighted resistor DAC
   (ii) R-2R ladder
5.  Explain the working of a second order active low pass filter with neat sketch and also draw its frequency response curve.
6. Explain the R-2R ladder and inverted R-2R ladder DACs.

Unit 4

1. Explain the operation of PLL with a suitable diagram. Show how phase locked loop can be employed for FSK demodulation.
2. Discuss the operation of the Voltage Controlled Oscillator with neat, functional diagram.
3. With neat diagram explain the operation of astable and monostable multivibrators. Design a 555 astable multivibrator to give 2 KHz pulse repetition frequency with 70% duty cycle. Use Vcc = 18V.
4. Explain the basic blocks of PLL and its operation. A PLL system with 105 KHz input has a VCO with 100 KHz free running frequency and 3.3 kHz/V sensitivity and phase detector sensitivity is 0.68 V/rad, and amplifier gain is 5. Calculate the loop gain, capture range, maximum error voltage and maximum amplitude of the output voltage of the system.
5. Briefly discuss the working of Phase Locked Loops (PLL).
6. With neat sketch, describe the working of a Astable multivibrator using 555 timer.

Unit 5

1. Design a voltage regulator circuit to produce a constant voltage of 9V and discuss the voltage regulator circuit.
2. Draw the functional block diagram of the IC 723 regulator and explain its current limiting feature and current fold-back characteristics.
3. With neat diagram explain IC723 general purpose voltage regulator. Explain the current limiting features of 723.
4. Explain the working principle of switch-mode power supplies along with its advantages and disadvantages.
5. Discuss the working of AD623 Instrumentation amplifier with neat sketch and also explain how it is used in the weight measurement.
6. Discuss the operation of Switched Mode Power Supply with neat sketch.