STUPIDSID
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:
FL < 20Hz. Av ~ 1500
SIco < 10. Ri > 10kΩ
Vcc= 12 V
Select transistor from the table at the end of question paper.
FL < 20Hz. Av ~ 1500
SIco < 10. Ri > 10kΩ
Vcc= 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)
(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) AVf - Voltage gain with feedback
(i) Type of feedback
(ii) Stability Ratio
(iii) AVf - Voltage gain with feedback
10 M
5 (a)
Design a class A transformer coupled power amplifier to obtain load resistance of 10Ω. Vcc = 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
Tjmax=125 °C, Tambient=30°C.
θ(j-c)=1 ° C/W, θ(C-HS)=0.5° C/W
Tjmax=125 °C, Tambient=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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