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SPPU Electronics and Telecom Engineering (Semester 4)
Analog Communication
December 2016
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

Solve any one question fromQ.1(a,b) and Q.2(a,b)
1(a) State and compare different SSB generation methods.
6 M
1(b) An angle modulated signal is described by the equation: $$\psi EM^{(t)}=10\cos \left ( 2\pi f_ct +4\sin 2\pi f_mt\right )$$/
i) Determine the Modulation Index. Estimate the transmitted signal bandwidth.
ii) Repeat (i) fm is doubled.
6 M

2(a) With the help of spectrum and block diagram explain VSB modulation. What is its application?
6 M
2(b) Derive an expression for frequency and phase modulated wave. Sketch their waveforms for a sinusoidal input.
6 M

Solve any one question fromQ.3(a,b) and Q.4(a,b)
3(a) Explain distortions present in simple diode detector.
6 M
3(b) State various sources of noise with examples. Explain the following types of noise in detail (any two):
i) Thermal noise
ii) Low frequency noise
iii) Shot noise.
6 M

6 M
4(b) Consider a receiving system consisting of an RF amplifier with noise figure of F1 = 2dB and a again a 9 dB followed by a mixer with a noise figure of F2 = 9 dB and a conversion gain of 15 dB.Calculate overall noise figure and noise temperature.
6 M

Solve any one question fromQ.5(a,b) and Q.6(a,b)
5(a) Describe threshold in angle modulation.
7 M
5(b) Explain the performance of DSBSC in presence of noise.
6 M

6(a) Explain the perfromance of AM in presence of noise.
7 M
6(b) Explain pre-emphasis and de -emphasis in FM.
6 M

Solve any one question fromQ.7(a,b) and Q.8(a,b)
7(a) Explain aliasing and different ways to avoid aliasing.
7 M
7(b) With the help of block diagram explain transmitter and receiver for Pulse code modulation.
6 M

8(a) Explain types of sampling with waveform. Which type is used for practical application?
7 M
8(b) With the help of neat diagram explain PWM.
6 M

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