GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-IV (NEW) EXAMINATION - WINTER 2020
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Subject Code:3141002 Date:09/02/2021
Subject Name:Analog Circuit Design
Time:02:30 PM TO 04:30 PM Total Marks:56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain Barkhausen criterion for oscillation. 03
(b) Explain internal block diagram of OP-AMP 04
(c) Explain the basic differentiator using an op-amp. What are the problems associated with this configuration? How they are overcome? 07
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Q.2 (a) Explain operation of PLL with basic blocks and mention any four applications of it in radio communication. 03
(b) Explain the working of a Square wave generator using op-amp 04
(c) Explain working of 555 timer based A-stable multivibrator. 07
Q.3 (a) Explain the concept of V to I converter with floating load. 03
(b) Explain inverting and non inverting amplifier using op-amp 04
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(c) Analyze second order butterworth low Pass filter. Draw its frequency response and state design procedure. 07
Q.4 (a) Explain the concept of virtual ground in op-amp. 03
(b) Explain absolute wave circuit. 04
(c) What is need of clipper circuit? Explain op-amp as a positive and negative clipper along with necessary waveforms. 07
Q.5 (a) What is Voltage limiter circuit? 03
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(b) Explain summing, scaling-and averaging amplifier. 04
(c) Draw op-amp based wein bridge oscillator. Obtain frequency of oscillation and discuss amplitude stabilization for same. 07
Q.6 (a) Explain peak detector circuit 03
(b) Explain differential amplifier using two op-amps 04
(c) Draw the hybrid II common emitter transistor model. Also derive the expression for transistor trans-conductance. 07
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Q.7 (a) Discuss fixed and adjustable voltage regulator with necessary circuit diagrams. 03
(b) Explain the magnitude and phase response of low pass function of biquad circuit. 04
(c) Derive the high frequency trance conductance equation for gm for CE amplifier. 07
Q.8 (a) State the relation between hybrid-II and h-parameters. 03
(b) Design RC phase oscillator for the frequency of 2 KHz. 04
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(c) Derive high frequency current gain for CE amplifier with Rs. 07
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