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:

x

Determine:

i) The carrier frequency

ii) Peak frequency deviation

iii) The modulation index.

x

_{c}(t)=10 cos [2π×10^{8}t+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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