MORE IN Principles of Analog & Digital Comm.
MU Information Technology (Semester 3)
Principles of Analog & Digital Comm.
December 2013
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

Attempt any four of the following:
1 (a) What is double spotting?
5 M
1 (b) Explain Eye pattern in detail
5 M
1 (c) Explain under water acoustic channel
5 M
1 (d) Explain low level modulated AM transmitter
5 M
1 (e) Compare FDM and TDM
5 M

2 (a) State and prove sampling theorem for low pass band limited signal
8 M
2 (b) Explain balanced modulator using FETs
6 M
2 (c) In an AM radio receiver the loaded Q of the antenna circuit at the input to the mixer is 100. If the intermediate frequency is 455 KHz, calculate the image frequency and its rejection at 1 MHz.
6 M

3 (a) Explain what is meant by quantization noise. Explain in detail.
8 M
3 (b) Find the mathematical expression of FM Signal
6 M
3 (c) Draw block diagram of BPSK generation with waveform
6 M

4 (a) Calculate the maximum bitrate for a channel having BW 3100 Hz and signal to noise ration 10db.
4 M
4 (b) State and prove the following properties of Fourier transform
(i) Time Shifting
(ii) Convolution in time domain
8 M
4 (c) Explain the term:
(i) Shot noise and equivalent noise temperature
(ii) Friis transmission formula
8 M

5 (a) Draw and explain PCM-TDM system
10 M
5 (b) What are the disadvantages of tune RF receiver? Draw the circuit of a superheterodyne receiver and explain the same.
10 M

6 (a) Draw neat block diagram of delta modulator and explain its working. What are the draw backs of delta modulator? How are they overcome by ADM?
8 M
Write Short notes on:
6 (b) (i) Noise Triangle
3 M
6 (b) (ii) Pre-emphasis and De-emphasis
3 M
6 (b) (iii) White noise
3 M
6 (b) (iv) Properties of line codes.
3 M

More question papers from Principles of Analog & Digital Comm.