GTU BE 2020 Summer Question Papers || Gujarat Technological University
Subject Code: 2141002
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- IV EXAMINATION — SUMMER 2020
Subject Name: ANALOG CIRCUIT DESIGN
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Draw simplified internal block diagram of 555 Timer IC. | 03 |
| (b) Draw and explain typical connection diagram of 78XX series voltage regulator. Also explain drop out voltage. | 04 | |
| (c) Derive the expression for the CE short-circuit current gain 4; as a function of frequency. | 07 | |
| Q.2 | (a) Define followings: (i) Input offset voltage (ii) CMRR (iii) PSRR. | 03 |
| (b) For Hybrid-p transistor model gm= 50 mA/V, rp =1 KO, Cc =1 pF, and Ce = 0.2 pF is given then determine the values of fß and fT. | 04 | |
| (c) Explain in detail transistor phase-shift oscillator and also derive expression for the frequency. | 07 | |
| OR | ||
| (c) Draw Wien-bridge oscillator circuit and obtain its frequency of oscillation. | 07 | |
| Q.3 | (a) Draw and explain block diagram of typical OP-AMP. | 03 |
| (b) List out characteristics of ideal OP-AMP. | 04 | |
| (c) What is Slew rate? What are its causes? Derive expression for maximum frequency of operation for desired output swing in terms of slew rate? | 07 | |
| OR | ||
| (a) Draw equivalent circuit of an OP-AMP. | 03 | |
| (b) Write a brief note on emitter-coupled Differential Amplifier. | 04 | |
| (c) What is instrumentation amplifier? With help of neat diagram explain operation of Three OP-AMP based Instrumentation amplifier. | 07 | |
| Q.4 | (a) Briefly explain Inverting Amplifier in open loop mode. | 03 |
| (b) Explain the circuit of voltage to current converter with floating load. | 04 | |
| (c) Draw and explain closed-loop differential amplifier with one OP-AMP and derive voltage gain equation. | 07 | |
| OR | ||
| (a) Briefly explain operation of basic differentiator circuit. | 03 | |
| (b) Draw and explain OP-AMP based Voltage-shunt feedback amplifier. Derive closed-loop voltage gain equation for the same. | 04 | |
| (c) Explain in detail inverting Schmitt trigger circuit. | 07 | |
| Q.5 | (a) Briefly explain Peaking Amplifier. | 03 |
| (b) With reference to filter design define following terms: (i) Pass band (ii) Stop band (iii) Attenuation (iv) Cut-off frequency | 04 | |
| (c) Show how Biquad circuit can be used as a universal filter? | 07 | |
| OR | ||
| Q.5 | (a) Draw and explain briefly Zero crossing detector circuit. | 03 |
| (b) Design a first order low-pass filter for the following specifications: (i) Passband voltage gain = 2 (ii) Cut-off frequency fc = 10 Khz. | 04 | |
| (c) With help of circuit diagram, explain operation of first order Butterworth low-pass filter. | 07 | |
Date: 27/10/2020
Total Marks: 70
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