University of Mumbai 2008-4th Sem B.E Electrical and Electronics Engineering Electronics Circuits - Question Paper
Electronics Circuits Sem IV May 2008
15-4-08-NK-E*. 206
Con. 2664-08.
si as
CO-9722 [Total Marks :
(REVISED COURSE)
(3 Hours)
N.B.(l) Question No. 1 is compulsory.
(?) Attempt any four questions from remainign six questions.
(3) Assume suitable data wherever required but justify the samo
(4) Figures to the right indicate marks.
1. Explain the following 20
(a) Miller's olfoct and frequency response
(b) Logarithmic and amilogarthmic amplifier using OP-Amp
(c) Characteristics ol negative feedback amplifiers.
(d) Low frequoncy oscillators
(e) Push-pull amplifiers.
?. Design a Iwo stage RC coupled CE amplifier to meet the following requirements ; 20
AV > 1800 Vo,-2-5 V
Fc < 15 Hz, Stability Ss 10 Assume hH * 220, hw 3-2 KO, |l * tSO.
3. (a) Effects of negative feedback on gain, stability, bandwidth, non-linear distortion etc. to (b) Identity the topology used in the following feedback amplifier with necessary justification to and determine Avtl , R, Rfil.
for both BJTs h = 1-1 kU
Il,( a 50 Neglect h
fft* 00'
4. (a) Explain Barkhausens criteria. Derive the expression for frequency of oscillation and condition 10
for oscillations of Wienbridge oscillator.
(b) Compare low frequency and high frequency oscillators. Explain the LC oscillators and 10 their applications.
5. (a) Explain the UJT and its characteristics. 10 (b) Derive expression for efficiency of class A power amplifier with transformer coupled load. 10
6. (a) Derive expressions for differential gam 'Ad1, input impedance *R, and output impedance 10
R0 of Balanced input and Balanced output differential amplifier.
(o) Draw the cascade configuration and explain Its working, merits and demerits. 10
7, (a) Draw and explain the operation of Transistorized bootstrap sweep generator. (D) Large signal amplifiers Vs Small signal amplifier.
10
10
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| Earning: Approval pending. |
