 MORE IN Linear Integrated Circuits
VTU Electronics and Communication Engineering (Semester 4)
Linear Integrated Circuits
December 2013
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Define the following op-amp parameters and mention their typical values for IC 74 ?
i) Input voltage range
ii) CMRR
iii) Input offset voltage
iv) Slew rate
v) Input impedance
10 M
1 (b) With a neat circuit diagram, explain direct coupled inverting amplifier. Also design an inverting amplifier using a 741 op-amp. The voltage gain is to be 75 and the output voltage amplitude is to be 3V, IH(max)=500nA.
10 M

2 (a) Explain a high input impedance capacitor coupled voltage follower, with necessary circuit diagram.
10 M
2 (b) Design a capacitor coupled inverting amplifier to operate with a +20V supply. The minimum input signal level is 50mV, the voltage gain is to be 68, the load resistance is 500?, and the lower cutoff frequency is to be 200Hz. Use a 741 op-amp.
10 M

3 (a) What are the effects of slew rate on
i) Bandwidth
ii) Output amplitude and
iii) Output pulse rise rime.
6 M
3 (b) With a neat circuit diagram, explain Zin Model technique of frequency compensation.
6 M
3 (c) What precautions should be observed for op-amp circuit stability? Draw the necessary diagram.
8 M

4 (a) With a neat circuit diagram, explain instrumentation amplifier.
8 M
4 (b) Explain the operation of high input impedance full-wave precision rectifier with necessary diagram. Draw the voltage waveform at various points in the circuit and write the appropriate equations to show that full-wave rectification is performed.
12 M

5 (a) With a neat circuit diagram and waveforms, explain operation of a triangular rectangular waveform generator with frequency and duty cycle controls.
10 M
5 (b) Explain and design an RC phase-shift oscillator with following specification: f0=5kHz, supply voltage=±15V. IC 741 is to be used.
10 M

6 (a) Explain the operation of an inverting Schmitt trigger circuit with different UTP and LTP levels. Discuss the design procedure and also indicate the input/output characteristics for the same.
10 M
6 (b) Design a second order high pass filter to have a cutoff frequency of 10 kHz. Use a 715 op-amp. Draw the circuit and indicate the frequency response of the filter IB(max)=1.5μA.
10 M

7 (a) Explain the terms line regulation, load regulation and ripple rejection for a dc voltage regulator.
6 M
7 (b) With a neat schematic, explain the salient features of 723 regulator.
8 M
7 (c) Explain the principle of operation of a switching regulator.
6 M

Write short notes on the following:
8 (a) 555 timer as monostable multivibrator.
5 M
8 (b) Voltage controlled oscillator.
5 M