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Roll No. ..................................

End-Term Examination

Fourth Semester [B.Tech] - May 2005

Paper Code : ETEC – 204 Subject : Analog Electronics - II

Time : 3 Hours

Maximum Marks : 75

Note : Attempt any 5 questions in all.

Q1

( a )

Using neat diagram, derive an expression for CMRR of dual input balanced output (DIBO) differntial amplifier.

8

( b )

Explain the principle of:
  1. Summing amplifier
  2. Current-to-voltage converter

7

Q2

( a )

Design a 4th order Butterworth LPF with cutoff frequency of 1 KHz

8

( b )

Design a BPF with a gain of Ao = 34 dB, center frequency fo = 180 Hz and 3 dB bandwidth of 18 Hz.

7

Q3

( a )

Derive an expression for frequency of oscillations of RC phase shift oscillator.

8

( b )

Explain the principle of various types of current mirrors.

7

Q4

( a )

Draw the internal diagram of an OTA and derive an expression for its voltage gain. Explain how an oscillator can be made by using an OTA.

8

( b )

Give the functional diagram of voltage to current converter and explain its operation.

7

Q5

( a )

Give the classification of various types of power amplifiers. Show that for a class-B push-pull amplifier,
  1. Maximum efficiency is 78.5 %
  2. Maximum power dissipation cannot exceed 40 % of its maximum power output.

10

( b )

Using OP-AMP explain the working of:
  1. log amplifier
  2. antilog amplifier

5

Q6

( a )

Using a neat circuit diagram, explain the operation of astable multivibrator (AMV). Find the expression for the frequency of oscillations.

8

( b )

Explain the principle of full-wave precision rectifier. Derive an expression for output voltages Vo.

7

Q7

( a )

Explain the working principle of PLL. Define various terms associated with it and give its typical applications.

8

( b )

How a VCO can be used used for the generation of:
  1. Triangular waveform
  2. Square waveform

7

Q8

Explain the principle of:

15

( a )

Tuned amplifier

( b )

Instrumentation amplifier

( c )

Level shifters

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