GTU Electronics and Communication Engineering (Semester 5)
Integrated Circuit And Application
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) (i) Op-amp (741) IC with an open loop gain equal to 2 ×105is used in open loop mode. Supply voltage is + 15V. Find out output voltage if (a) Vid = -20 mV, and (b) Vid = 50 μV. Vid is input differential voltage across positive and negative input terminals of op-amp. and (d) Output voltage swing.
4 M
1 (a) (ii) Define following terms for op-amp: (a) CMRR, (b) SVRR, (c) Slew Rate
3 M
1 (b) Design non-inverting op-amp (741) based amplifier which has feedback Resistance (RF) equal to 10 kΩ and closed loop gain of 11. For this circuit, calculate RiF,RoF,FF and V∞T (total output offset voltage with feedback).
7 M

2 (a) Draw two op-amp based differential amplifier and derive expression for its gain, input and output resistances, and bandwidth.
7 M
2 (b) Discuss design steps for input offset voltage compensating network.
7 M
2 (c) For an inverting amplifier with a gain equal to -100 and feedback resistance of 47 kΩ, determine maximum possible output offset voltage due to (1) input offset voltage of 6 mV, and (2) Input bias current of 500 nA. What value of R OM is needed to reduce offset voltage effect due to the effect of input bias current?
7 M

3 (a) Draw schematic of single supply based op-amp AC inverting amplifier. Explain its working along with necessary input and output waveforms.
7 M
3 (b) Design a practical op-amp based integrator such that peak gain is 20 dB and the gain is 3 dB down from its peak value at w equal to 10,000 rad/s. Use capacitance of 0.01 μF
7 M
3 (c) Describe the operation of differential instrumentation amplifier which uses resistive transducer in a bridge circuit. Show that the output voltage is directly proportional to the change in resistance value of a transducer.
7 M
3 (d) Draw and explain working of basic differentiator circuit. What are the limitations of this circuit? How it can be corrected?
7 M

4 (a) Explain working of op-amp based Schmitt trigger circuit along with schematic and input/output waveforms.
7 M
4 (b) Illustrate operation of op-amp based triangular wave generator circuit with necessary waveforms as well as mathematical steps.
7 M
4 (c) Draw op-amp based full wave rectifier (absolute-value) circuit. Explain its working with necessary input/output waveforms.
7 M
4 (d) Discuss operation of op-amp based saw-tooth wave generator circuit with relevant diagram and waveforms.
7 M

5 (a) Describe operation of each block of phase locked loop. List out PLL Applications.
7 M
5 (b) Draw Sallen-key low-pass filter circuit and obtain its transfer function.
7 M
5 (c) Draw 555 timer block diagram. Explain its working and its use as a monostable multivibrator.
7 M
5 (d) Sketch Delyiannis-Friend circuit and obtain its transfer function.
7 M



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