STUPIDSID
Solve any one question from Q1 and Q2
1 (a)
Explain phase shift method of generation of SSB-SC signals.
6 M
1 (b)
A frequency modulated signal is given by:
xc(t)=10 cos [2π×108t+5 sin 2π×200t]
Determine:
i) The carrier frequency
ii) Peak frequency deviation
iii) The modulation index.
xc(t)=10 cos [2π×108t+5 sin 2π×200t]
Determine:
i) The carrier frequency
ii) Peak frequency deviation
iii) The modulation index.
6 M
2 (a)
Explain the ring modulator method to generate DSB-SC signal with waveform.
6 M
2 (b)
Give comparison between FM and PM.
6 M
Solve any one question from Q3 and Q4
3 (a)
Explain principle of operation of envelope detector. State the conditions to avoid distortion.
6 M
3 (b)
Derive Friss formula considering only three amplifiers in cascade.
6 M
4 (a)
Explain superheterodyne receiver characteristics: i) Sensitivity
ii) Selectivity
iii) Fidelity.
ii) Selectivity
iii) Fidelity.
6 M
4 (b)
A low noise amplifier of 30K equivalent noise temperature and 20dB available power gain precedes a microwave receiver which has a noise figure of 25 dB. What is the overall equivalent temperature, if the room temperature is 27°C.
6 M
Solve any one question from Q5 and Q6
5 (a)
Derive equation of figure of merit for noise contaminated DSB-SC system.
6 M
5 (b)
Critically compare the noise performance of AM, DSB-SC and SSB-SC system.
6 M
6 (a)
Show that a SSB-SC system gives the same destination SNR as a base band system.
7 M
6 (b)
Explain the need of pre-emphasis and de-emphasis in the case of FM system. How is it implemented?
6 M
Solve any one question from Q7 and Q8
7 (a)
Explain how a PAM signal may be generated. How can it be demodulated?
7 M
7 (b)
State the low pass sampling theorem and briefly explain its significance.
6 M
8 (a)
Describe with the help of neat sketches of waveforms methods of generation of PDM/PWM and PPM.
7 M
8 (b)
What is aliasing? How can it be avoided?
3 M
8 (c)
Draw and explain a circuit for flat top sampling.
3 M
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