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# 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: Summing amplifier 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, Maximum efficiency is 78.5 % Maximum power dissipation cannot exceed 40 % of its maximum power output. 10 ( b ) Using OP-AMP explain the working of: log amplifier 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: Triangular waveform Square waveform 7

 Q8 Explain the principle of: 15 ( a ) Tuned amplifier ( b ) Instrumentation amplifier ( c ) Level shifters