# Download GTU B.Tech 2020 Summer 4th Sem 2141002 Analog Circuit Design Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 4th Sem 2141002 Analog Circuit Design Previous Question Paper

Seat No.: ________
Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? IV EXAMINATION ? SUMMER 2020
Subject Code: 2141002 Date:27/10/2020
Subject Name: ANALOG CIRCUIT DESIGN
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS
Q.1 (a) Draw simplified internal block diagram of 555 Timer IC.
03

(b) Draw and explain typical connection diagram of 78XX series voltage
04
regulator. Also explain drop out voltage.

(c) Derive the expression for the CE short-circuit current gain Ai as a function of
07
frequency.

Q.2 (a) Define followings: (i) Input offset voltage (ii) CMRR (iii) PSRR.
03

(b) For Hybrid- transistor model gm = 50 mA/V, rb'e = 1 K, Ce = 1 pF, and Cc =
04
0.2 pF is given then determine the values of f and fT.

(c) Explain in detail transistor phase-shift oscillator and also derive expression for
07
the frequency.

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
07
frequency of operation for desired output swing in terms of slew rate?

OR

Q.3 (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
07
operation of Three OP-AMP based Instrumentation amplifier.
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 ex
plain closed-loop differential amplifier with one OP-AMP and
07
derive voltage gain equation.

OR

Q.4 (a) Briefly explain operation of basic differentiator circuit.
03

(b) Draw and explain OP-AMP based Voltage-shunt feedback amplifier. Derive
04
closed-loop voltage gain equation for the same.

(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:
04
(i) Pass band (ii) Stop band (iii) Attenuation (iv) Cut-off frequency

(c) Show how Biquad circuit can be used as a universal filter?
07

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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:
04
(i) Passband voltage gain = 2 (ii) Cut-off frequency fc = 10 Khz.
(c) With help of circuit diagram, explain operation of first order Butterworth low-
07
pass filter.
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