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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
Course Code: EC204
Course Name: ANALOG INTEGRATED CIRCUITS (AE, EC)
Max. Marks: 100 Duration: 3 Hours
PART A
Answer any two full questions, each carries 15 marks. Marks

1 a) Derive CMRR, input resistance and output resistance of a dual input balanced (8)
output differential amplifier configuration.

b) Define the following: (3)
i)Input bias current ii)Input offset current iii) Input offset voltage

c) Implement the equation using two op-amps (4)
Vo = 5۷, +2۷ -10V3

2 a) Derive the following characteristics of voltage shunt amplifier: (8)

i) Closed loop voltage gain ii) Input resistance
111) Output resistance iv)Bandwidth

b) What is slew rate? Derive an equation for it. (4)

c) A differential amplifier has a common mode gain of 0.05 and difference mode (3)
gain of 1000.Calculate the output voltage for two signals V1 = 111 and V2 =
0.9mV

3 a) Explain the variation of differential gain of a differential amplifier with frequency (5)
of operation with relevant expressions.

b) Draw the circuit diagram of a differential instrumentation amplifier with a (7)
transducer bridge and show that the output voltage is proportional to the change in
resistance.

c) How a constant current bias circuit can be used to improve the CMRR of 8 (3)
differential amplifier?

PART 8
Answer any two full questions, each carries 15 marks.

4 a) Draw the circuit of a temperature compensated logarithmic amplifier and show (8)
that it provides temperature independent logarithmic output.
b) Explain the working of a triangular waveform generator with a neat circuit (7)
diagram. Also derive an expression for frequency of oscillation.
5 a) Draw the circuit of a Wien Bridge oscillator using op-amp and derive an equation (7)
for frequency of oscillation.
b) With a neat circuit diagram explain the working of astable multivibrator using op- (8)
amp. Also derive an expression for time period.
6 a) Drawthe circuit of second order low pass filter and derive its transfer function. (8)
b) Draw the circuit of a precision full-wave rectifier and explain its working. (7)

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