 MORE IN Linear Integrated Circuits
VTU Electronics and Communication Engineering (Semester 4)
Linear Integrated Circuits
December 2012
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) Explain the basic circuit of operational amplifier.
8 M
1 (b) Define Slew rate and unity gain band width. What is the effect of slew rate on the output voltage of an op-amp?
6 M
1 (c) Design an inverting amplifier using op-amp 741. The voltage gain in to be 50 and the output voltage amplitude is to be 2.5V.
6 M

2 (a) With a neat circuit diagram, explain capacitor coupled voltage followers with relevant design steps.
10 M
2 (b) With a neat circuit diagram, explain the design of high input impedance capacitor capacitor coupled non-inverting amplifier.
10 M

3 (a) Explain how stability of high gain amplifier and lower gain amplifier is analysed.
6 M
3 (b) Explain phase-log compensation and phase lead compensation.
10 M
3 (c) Determine the upper cut-off frequency for a (i) voltage follower, (ii) unity gain inverting amplifier using a 741 op-amp. Given that of 741 is 800 kHz.
4 M

4 (a) With a neat circuit diagram, explain op-amp as precision voltage source.
10 M
4 (b) Briefly explain non[-saturating precision half with rectifier
5 M
4 (c) Using Bipolar op-amps with Vcc=+15V, design the high input impedance precision full wave rectifier. The input peak voltage is to be IV and no amplification is to occur.
5 M

5 (a) A ±5, 10kHz square wave from a signal source with a resistance of 100? is to have its positive peak clamped precisely at ground level. Tilt on the output is not to exceed 1% of the peak amplitude of the wave. Design a suitable op-amp circuit for precision clamping using a supply of ±12V.
8 M
5 (b) Briefly explain op-amp square wave/triangular wave generator with relevant circuit diagram, waveform and expressions.
8 M
5 (c) Using a BJFET op-amp with a supply of ±12V, design a Wein bridge oscillator to have an output frequency of 15 kHz.
4 M

6 (a) With a neat circuit diagram, waveform and expressions explain capacitor coupled non-inverting crossing detector.
8 M
6 (b) Explain op-amp inverting Schmitt trigger for adjustable UTP and LTP.
8 M
6 (c) Using a 741 op-amp design a first order active low pass filter have a cut off frequency of 1 kHz.
4 M

7 (a) With a neat internal diagram of IC723, explain the functions of each block.
10 M
7 (b) Explain basic switching regulator circuit with relevant expressions. Mention its advantages and disadvantages.
10 M

8 (a) Explain 555 timer as monostable multivibrator with relevant circuit diagram, waveforms and expressions.
7 M
8 (c) Explain op-amp D/A converter with R and 2R resistors.
7 M
8 (c) Draw the block diagram of PLI and explain it.
6 M

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