Download AKTU B-Tech 4th Sem 2014-15 Electronics Circuits Question Paper

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130401

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PAPER ID: 130401

Roll No.

B.Tech.

(SEM. IV) THEORY EXAMINATION, 2022-23

ELECTRONIC CIRCUITS

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Time: 3 Hours] [Maximum Marks: 100

Note:

1. Attempt all questions.
2. All questions carry equal marks.

1. Attempt any four parts of following: 10×2=20
   1. Derive an expression for the voltage gain (Av) of the circuit in the Figure 1.

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   2. Discuss how the performance of an amplifier is affected by the operating point.
   3. What is emitter stabilization in self-bias circuit of an npn transistor in CE amplifier? Explain the high frequency response of common emitter amplifier.
2. Attempt any two parts of following: 15x2=30
   1. Explain the small signal operation of BJT differential pair and derive the expressions for differential input resistance and gain.
   2. Explain CS MOS differential pair and discuss the non ideal characteristics of MOS differential pair.

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   3. Calculate the output resistance and CMRR for active loaded BJT differential pair.
3. Attempt any two parts of following: 15x2=30
   1. Draw a neat sketch of a generalized resonant circuit oscillator using three impedances. Explain Hartley oscillator and derive the frequency of oscillation.
   2. Define the Barkhausen criterion for oscillation. Derive an expression for frequency of oscillation of Wein bridge oscillator.
   3. Discuss the effect of negative feedback on noise and Bandwidth of an amplifier. Calculate the gain, input resistance and output resistance of trans-resistance amplifier.

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