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B.TECH 5th sem Analog Communication paper 2016

UniversityVTU, Belgaum, Karnataka
CourseB.TECH
Semester5
SubjectAnalog Communication
Year2016
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Heman Sharma
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a. Explain mean, correlation and covariance functions of a random process x(t)

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b. Explain the properties of auto correlation function and power spectral density.

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a. Define demodulation and show that a square law device can be used to detect AM waves.

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b. Explain the generation of DSB -SC wave using ring modulator.

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c. A 250 W carrier of 1000 KHz is simultaneously modulated by sinusoidal signals of 2 KHz,6 KHz and 8 KHz with modulation indices of 35%, 55% and 75% respectively. What are the frequencies present in the modulated wave and what the radiated power? 

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a. With the neat diagram, explain the operation of quadrature carrier multiplexing.

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b. Describe phase discrimination method of generating SSB waves.

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c. Consider a message signal m(t) containing the frequency complents 100, 200 and 400 Hz.This message signal is applied to an SSB modulator together with a carrier at 100 KHz with only USB retained. The coherent detector employed at the receiver uses a local oscillator that gives a sine wave of frequency 100.02 KHz.

i) Determine the frequency component of the detector output

ii) Repeat your analysis assuming only LSB is transmitted,


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a. Derive the time domain expression of VSB modulated wave s(t) containing a vestige of upper side band.

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b. Explain the scheme for generation and demodulation of VSB waves with relevant block diagrams, and mathematical expressions.

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c. With a neat block diagram, explain the operation of AM super heterodyne receiver.

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a. Define the terms:

i) modulation index

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a. Define the terms:

ii) band width

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a. Define the terms:

iii) frequency deviation in the case of frequency modulation

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b. Explain the direct method of generating FM waves. 

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c. An angle modulated signal is defined by s(t) = 10 cosvolts find the following:

i) The power in modulated signal

ii) The frequency deviation 

iii) Phase deviation 

iv) The approximate transmission bandwidth.


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a. With the help of circuit diagram, explain demodulation of FM wave using balanced frequency discriminator. 

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b. With relevant block diagram, explain FM stereo multiplexing.

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c. Explain non-linearity and its effects in FM system.

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a. Define :shot noise, thermal noise, white noise.

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b. Define noise equivalent band width and derive the expression for the same.

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c.Two 2-port devices are connected in cascade. For the first stage, the noise Figure and available power gain are 5 dB and 12 dB respectively. For the second stage, the noise figure and available power gain are 15 dB and 10 dB respectively. Determine the overall noise figure in dB.

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a. Derive the expression for the figure of merit of DSB-SC receiver.

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b. Describe the pre-emphasis and de emphasis in FM.

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c. An FM signal with a deviation of 75 KHz is applied to an FM demodulator. When the input SNR is 15 dB, the modulating frequency is 10 KHz, estimate the SNR at the demodulator output. 

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