University of Mumbai 2007-4th Sem B.E Electrical and Electronics Engineering Electronic Circuits emr - Question Paper

(REVISED COURSE)

(3 Hours)

N.B.: (1)    Question No. 1 Is compulsory.

(2)    Assume any suitable data wherever required but Justify the same.

(3)    Attempt any four questions from remaining six questions.

(4)    Figures to the right indicate marks.

1.    Explain Barkhausens criteria. Compare RC and LC oscillator. Derive equation tor frequency 20 of oscillation of RC phase shift oscillator using BJT as basic amplifier. Derive the condition

of oscillation.

2.    Design a twc stage RC coupled CE amplifier to meet the following requirements : 20

\ 1600 omax " *^v

F_e <20 Hz

Stability factor S < 10

Assume h_fe = 220, h_ifl = 2-7 k Q, p 150

3.    (a) Draw various types of negative feedback topologies. Explain their effect on gain, 14

input impedance and output impedance. State advantages of negative feedback. Explain each one in brief.

(b) Explain Instrumentation amplifier.    6

4.    (a) Derive A_d, R_f and R₀ for SISO differential amplifier.    10 (b) Write dcwn the designing steps for class A power amplifier. 10

5.    (a) Draw block diagram of OP-AMP. Explain each block in brief. Explain virtual ground 10

concept.

(b) Draw neat diagram of UJT relaxation oscillator. Explain its operation. Derive the 10 expression for frequency of output signal. Draw various waveforms.

6. (a) What is Miller Effect ? How it is useful in analysing frequency response of amplifier ?    10

(b) Explain the classification of large signal amplifiers. Explain crossover distortion.    10

7. Write short notes on

(a)    Differential amplifier using FETs and its ac analysis.

(b)    Op-amp parameters.

(c)    Darlington pair and its application.

(d)    Push-pull amplifiers.

20

Attachment: university-of-mumbai-2007-b-e-electrical-and-electronics-engineering-51220-1.pdf

Earning:   Approval pending.