Kurukshetra University 2009-3rd Sem B.Tech Electronics and Communications Engineering B,tech ester(Analog Communication ) - Question Paper

BT-3/D09
ANALOG COMMUNICATION
Paper : ECE-203(E)
Time : 3 hours
Maximum Marks : 100

Note : Attempt any 5 ques..All ques. carry equal marks.


1.(a) explain noise in FM reception.
(b)Explain the different sources of noise.

2.(a)What is SSB modulation? discuss the benefits of using SSB modulation.
(b)Explain Phase discrimination method.

3.(a)Describe Phase-locked looped demodulator.
(b)An FM wave is applied to a square-law device with output voltage V2 related to input voltage V1 by V2=a(V1square) where ‘a’ is a constant. discuss how such a device can be used to find an FM wave with a greater frequency deviation than available at the input.

4.(a)Explain the tracking and alignment of receivers.
(b)Explain the block diagram of AM transmitter.

5.(a)Derive mathematical representation of random noise.
(b)Explain the noise in reactive circuits.

6.(a)Derive power relations in AM wave.
(b)Explain the spectrum of AM wave.

7.(a)Draw the circuit diagram of a ratio detector and discuss its operation. How is amplitude limit found in this detector?
(b)Compare FM and PM signals.

8.Write short notes on the subsequent :
(a) AGC
(b) FDM
(c) TRF receivers

Earning:   Approval pending.