MU Discrete Electronic Circuits - May 2013 Exam Question Paper

MU Electronics Engineering (Semester 4)
Discrete Electronic Circuits
May 2013

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any four of the following:-

1 (a) Differentiate between direct coupled amplifier and R-C coupled amplifier.

5 M

1 (b) Differentiate between small signal amplifier and power amplifier.

5 M

1 (c) Explain why constant current source is used in differential amplifier?

5 M

1 (d) Give criterion of sustained sinewave oscillations and explain how oscillations start and stabilize in oscillator circuit.

5 M

1 (e) Give important features of CASCODE amplifier.

5 M

2 Design a two stage RC coupled amplifier for following requirements:
F_L < 20Hz. A_v ~ 1500
S_Ico < 10. R_i > 10kΩ
V_cc= 12 V
Select transistor from the table at the end of question paper.

20 M

3 (a) Explain how high frequency response of one stage RC coupled JFET CS type of amplifier can be determined.

10 M

3 (b) For the differential amplifier shown in figure, determine:
(i) Q-point of transistors.
(ii) Differential voltage gain (Ad)

10 M

4 (a) List Different types of negative feedback, give their stability ratios, effect of feedback on input and on output resistance.

10 M

4 (b) For the amplifier shown in figure, determine -
(i) Type of feedback
(ii) Stability Ratio
(iii) A_Vf - Voltage gain with feedback

10 M

5 (a) Design a class A transformer coupled power amplifier to obtain load resistance of 10Ω. V_cc = 12V d.c.

10 M

5 (b) Draw the circuit diagram of Wein Bridge Oscillator and explain its working.

10 M

6 (a) Discuss problems encountered in multistage direct coupled amplifiers and how to take care of these problems?

10 M

6 (b) For power amplifier dissipation of 25 Watts design a heat sink if:-
θ_(j-c)=1 ° C/W, θ_(C-HS)=0.5° C/W
T_jmax=125 °C, T_ambient=30°C.

10 M

Write short notes on any three:-

7 (a) Crossover distortion in class B amplifier and how to minimize that.

7 M

7 (b) Class C amplifier and its application.

7 M

7 (c) Nyquist Stability Criterion.

7 M

7 (d) Hartley Oscillator.

7 M

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