VTU Linear Integrated Circuits - June 2014 Exam Question Paper

VTU Electronics and Communication Engineering (Semester 4)
Linear Integrated Circuits
June 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 parameters and mention its practical values for op-Amp 741.
(i) CMRR (ii) Slew-rate (iii) PSRR (iv) Output offset voltage.

8 M

1 (b) Explain direct-coupled two I/P-Inverting summing amplifier with neat diagram and necessary design steps.

6 M

1 (c) A non-inverting amplifier is to amplify a 100 m.V. signal to a level to 5 V. Using a 741op-Amp, design a suitable circuit

6 M

2 (a) Sketch the circuit of a high z_in capacitor coupled voltage follower and design its steps.

6 M

2 (b) A capacitor coupled non-inverting amplifier using 741 op-amp has A_v=100 & V_o=5V. The load resistance is 10 k? and the lower cut-off frequency is to be 100 Hz. Design a suitable circuit.

8 M

2 (c) Explain inverting A.C. Amplifier with neat diagram and mention its design steps using only single-supply op-amp.

6 M

3 (a) Explain phase lead and phase lag compensation methods along with frequency response

8 M

3 (b) Consider a 741 op-Amp with slew rate of 0.6 V/μs is used as a voltage follower. Calculate (i) The slew rate limited cut-off frequency if the sine wave o/p is 6V. (ii) Calculate the maximum peak value of the sinusoidal o/p voltage, if the circuit operator with unity gain cut-off frequency of 800 kHz. (iii) Calculate the maximum peak value of the o/p voltage if the upper cut-off frequency is 8kHz.

6 M

3 (c) List the precautions that should be used for op-amp circuit stability.

6 M

4 (a) Draw the circuit of an instrumentation amplifier and explain how the voltage gain can be varied?

10 M

4 (b) Discuss the operation of precision full wave rectifier circuit using bipolar op-amp.

10 M

5 (a) Explain the operation of op-amp sample and hold circuit with signal, control and output waveforms.

8 M

5 (b) Draw a neat sketch and explain the working of wein bridge oscillator circuit.

6 M

5 (c) Explain frequency doubler technique using op-amp.

6 M

6 (a) Sketch the circuit of a second order low lass filter and explain its working.

7 M

6 (b) An INV Schmitt trigger circuit is to have UTP=0V and LTP=2.5V. Determine a suitable circuit using a bipolar op-amp with ±/15 V supply.

6 M

6 (c) Sketch the circuit of an op-amp astable multivibrator and show the voltage waveforms at various points and explain its operation.

7 M

7 (a) Explain the terms line, load regulation and ripple rejection for a dc voltage regulator.

6 M

7 (b) Design a voltage regulator using IC723 to get a voltage o/p of 25 V.

8 M

7 (c) Mention the salient features of a 723 regulator.

6 M

8 (a) Explain Mono-stable multi-vibrator using 555 lc?

6 M

8 (b) With a neat sketch, explain the working of a R-2R ladder network.

8 M

8 (c) With block diagram, explain successive approximation ADC.

6 M

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