Discrete Electronic Circuits - Dec 2014

Electronics Engineering (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Solving the following questions:-

1 (a) Explain the clamper circuit with proper waveforms.(4 marks) 1 (b) What are different biasing methods used for common source configuration and hence explain any one in detail.(4 marks) 1 (c) Explain why the feedback is required in oscillators.(4 marks) 1 (d) Explain need of constant current source in differential amplifier.(4 marks) 1 (e) Design self bias circuit using JFET for mid point biasing Let IDSS=8mA, Vp=-3V.(4 marks) 2 (a) Design voltage divider biased circuit to give Icq=5mA, VCEq=5V and β=100.(10 marks) 2 (b) Explain complete the frequency response of CS amplifier.(10 marks) 3 (a) Explain working of CASCODE Amplifier in detail.(10 marks) 3 (b) For the given circuit find Icq, VCEq, Ad, ACM and CMRR (10 marks) 4 (a) Explain working of class A transformer coupled power amplifier ad derive equation of power efficiency.(10 marks) 4 (b) What are different biasing circuits for E MOSFET explain any one in detail.(10 marks) 5 (a) Explain working of any one high frequency oscillator circuit and give its applications.(10 marks) 5 (b) Explain current-series feedback amplifier with the help of block diagram and derive expressions for Rif, Rof and Af.(10 marks) 6 (a) For the given two stage circuit find Ri, Ro and Voltage gain. (12 marks) 6 (b) Explain MOSFET Wilson current source.(8 marks)