GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2141002
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Analog Circuit Design
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) List out characteristics of ideal op-amp. | 03 |
| (b) Compare RC phase shift oscillator with Wien bridge oscillator. | 04 | |
| (c) List the parameter those affecting to the transistor at high frequencies. Draw the hybrid p model for CE configuration and explain it. Also derived the equation for any two above listed parameter for CE configuration. | 07 | |
| Q.2 | (a) Write short note on validity of hybrid-p model. | 03 |
| (b) Draw and explain the equivalent circuit of a crystal. | 04 | |
| (c) Explain various open loop configuration of op-amp. | 07 | |
| OR | ||
| (a) Derive expression for closed loop gain of a voltage series feedback amplifier using op-amp. | 07 | |
| (b) Draw and explain block diagram of op-amp. | 03 | |
| (c) Define the following parameters of Op-Amp: (i) Input bias current (ii) CMRR (iii) Input offset voltage (iv) Input offset current | 04 | |
| Q.3 | (a) Show how Op-Amp can be used as summing, scaling and averaging amplifiers using non inverting configuration. | 07 |
| OR | ||
| (a) What is differential amplifier? Explain in brief. | 03 | |
| (b) Define the following parameters of Op-Amp: (i) Slew Rate (ii) PSRR (iii) Gain-Bandwidth Product (iv) Output offset voltage | 04 | |
| (c) Explain the basic differentiator using an op-amp. What are the problems associated with this configuration? How they are overcome? | 07 | |
| Q.4 | (a) State the properties of Butterworth filter. | 03 |
| (b) Draw and explain zero crossing detector. | 04 | |
| (c) Draw the non-inverting Schmitt trigger circuit and explain the threshold levels and hysteresis. | 07 | |
| OR | ||
| (a) What is thermal drift? How does it affect the performance of an op-amp circuit? | 03 | |
| (b) Draw and explain peak detector. | 04 | |
| (c) What is PLL? Explain operation of PLL with basic blocks and mention any four applications of it in radio communication. | 07 | |
| Q.5 | (a) Briefly explain Notch filter. | 03 |
| (b) For an astable multivibrator using 555 timer, Ra=2.2KO, Rb=3.9KO and C=0.1µF, determine the positive pulse width, negative pulse width and free running frequency. | 04 | |
| (c) Draw sallen-key LPF and derive its transfer function. | 07 | |
| OR | ||
| (a) What is the difference between active and passive filter. | 03 | |
| (b) Discuss magnitude and frequency scaling in filter design. | 04 | |
| (c) Show how Bi-quad circuit can be used as a universal filter? | 07 | |
Date: 09/05/2019
Total Marks: 70
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