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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 one question from Q1 and Q2
1 (a) Explain the phase shift method for generating SSB-SC. State its advantages and disadvantages.
6 M
1 (b) Differentiate between NBFM and WBFM.
6 M

2 (a) Compare between DSB-FC, DSB-SC, and SSB-SC.
6 M
2 (b) An angle modulated wave with a carrier frequency ωc=2πX10-5 is defined by the equation, φEM(t)=10 cos (ωc t+5 sin 2000 π t). Find.
i) Power of the modulated signal
ii) Frequency deviation
iii) bandwidth
6 M

Answer any one question from Q3 and Q4
3 (a) Explain FM detection using PLL.
6 M
3 (b) Three resistors of 10 KΩ, 22KΩ and 33 KΩ are at room temperature (27°C). For a bandwidth of 100 kHz. Calculate the thermal noise voltage generated by:
i) Each resistor
ii) Three Resistors in series
iii) Three Resistors in parallel
6 M

4 (a) Explain how a diode can be used to detect an AM signal. What are the different types of distortions that occur in a typical diode detector circuit?
6 M
4 (b) Derive the Friss's formula for Noise Factor of amplifiers in cascade.
6 M

Answer any one question from Q5 and Q6
5 (a) Explain the performance of Baseband system in presence of noise.
7 M
5 (b) Explain threshold in angle modulation.
6 M

6 (a) Explain the performance of AM in presence of noise.
8 M
6 (b) With the help of mathematical expression explain which is superior PM/FM?
5 M

Answer any one question from Q7 and Q8
7 (a) Explain band Limited and time limited signal.
6 M
7 (b) What is Nyquist criterion? State sampling theorem in time domain. Draw the spectrum showing aliasing and guard band.
7 M

8 (a) Compare between PAM, PWM and PPM.
6 M
8 (b) With the help of block diagram, explain transmitter and receiver of pulse code modulation.
7 M

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