ELEC 470, Spring 2004
Prof. Rich Kozick
Date Assigned: Tuesday, March 23, 2004
Date Due: Tuesday, March 30, 2004
Please continue studying Chapter 4 of the Lathi text
on amplitude modulation, particularly Sections 4.7 and 4.8.
I suggest that you read Section 4.9 on television.
We will not discuss Section 4.9 in class, but it is a good
application of the AM topics in Chapter 4.
Please begin reading Chapter 5 on angle modulation.
- Special Topic Reports:
list of topics
on the course web page, and if your topic is a duplicate,
then send me your new topic choice by Thursday, March 25.
- Problems: Please solve the following
problems in the Lathi text and submit your solutions on
4.8-1 and 4.8-2.
- Please run the Simulink program
which is available on the
course home page under
Demonstrations and Class Notes.
In the DSB-SC demodulator using a Costas phase-locked loop
in program costas_demo.mdl,
what is the effect of the "Slider Gain" that amplifies
the signal prior to being input to the VCO?
What happens if this gain is too small? What happens
if this gain is too large?
Consider the filter that immediately precedes the Slider Gain:
what signal is this filter designed to remove?
Recall that in this program, you can change the phase and the
in the "TX Carrier" to cause the Costas loop to hunt
for a new frequency-lock and phase-lock.