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VTU Electronics and Communication Engineering (Semester 4)
Linear Integrated Circuits
December 2014
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 terms as applied to op-amp and mention their typical values for IC741:
i) CMRR; ii) Slew rate; iii) PSRR; iv) Input off set voltage.
8 M
1 (b) Sketch an op-amp direct coupled difference amplifier circuit. Explain the operation of the circuit and derive an equation for the output voltage.
7 M
1 (c) Design a direct coupled non inverting amplifier to amplify 100mV signal using IC741 to a level of 4 volts.
5 M

2 (a) With a neat circuit diagram, explain capacitor coupled voltage followers with relevant design steps.
7 M
2 (b) Explain how the upper cutoff frequency can be set for inverting amplifiers.
7 M
2 (c) Design a capacitor coupled inverting amplifier using a IC741. Op-Amp to have a voltage gain of 75 output voltage amplitude of 3 Volts and a signal frequency range of 20Hz to 12kHz. The load resistance is 470?.
6 M

3 (a) Explain miller effect compensation.
8 M
3 (b) List the precautions to be observed for Op-Amp stability.
6 M
3 (c) Using an LM108 Op-Amp, design an inverting amplifier to amplify a 100mV signal by factor 3. select suitable frequency compensation (IB(max) for LM108 is 2nA).
6 M

4 (a) With neat circuit diagram and waveforms at various points, explain the working of high input impedance full wave precision rectifier.
10 M
4 (b) Compare the performance of a differential input/output amplifier with that a difference amplifier.
4 M
4 (c) Design a precision voltage source to get an output of 8.5V using 741 Op-Amp. The supply voltage is ±15V and zener diode has a tolerance of ±5%.
6 M

5 (a) With neat circuit diagram and waveform, explain the working triangular/rectangular waveform generator with frequency and duty cycle control.
10 M
5 (b) With neat circuit diagram, explain basic log amplifier and derive an expression its o/p voltage.
5 M
5 (c) Using a 741 Op-Amp with a supply of ±12V, design a phase shift oscillator to have an output frequency of 3.5kHz.
5 M

6 (a) With neat circuit diagram and waveforms, explain the circuit operation of an Op-Amp inverting Schmitt trigger circuit.
8 M
6 (b) With neat circuit diagram and waveforms, explain the operation of Op-Amp astable multivibrator.
6 M
6 (c) Using a 741 op-amp design a record order high pass filter for a cut off frequency of 4.5 kHz.
6 M

7 (a) List and explain the characteristics of three terminal IC regulator.
6 M
7 (b) Explain the principle of switching regulator. Mention its advantages.
7 M
7 (c) Design a voltage regulator using IC723 to get a voltage output of.
7 M

8 (a) Explain 555 timer as monostable multivibrator with relevant circuit diagram, waveforms and expressions.
8 M
8 (b) With a neat diagram, explain the working of weighted resistor DAC.
6 M
8 (c) Draw the block diagram of PLL and explain its operation.
6 M

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