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EE3120
Chapter 1
Lecture 4
Introduction to Systems
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View Full Document Systems exist all around us, in many different forms.
Some systems include:
•
Transducer
– transform signals from one form to another (voltage to acoustic)
•
Filter
– remove noise or undesired frequencies from signals
•
amplifier
– increase or decrease amplitude of a signal
•
motors, generators, modulator, demodulator, mixer
Linear Systems and Signals
Lecture 4:
Systems
System
( )
x t
( )
y t
•
input
•
excitation
•
cause
•output
•response
•effect
In EE 3120 systems will be modeled as a “black box”.
•
The black box system will have at least one input terminal and one output terminal.
System
i
input signals, excitation, or cause
k
output signals, response, or effect
( )
i
x t
( )
k
y t
SISO – single input single output system (this course)
MIMO – multiple input multiple output system (other courses)
Results of SISO systems can be easily applied to MIMO systems
Systems
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View Full Document Systems
A signal can be applied or measured at any terminal, input or output.
The contents or structure of the black box may or may not be known, and can be found
by observation or derivation using the physical laws of the system.
Ex.
Circuits can be modeled mathematically using Kirchoff’s laws.
There are three main areas of system study:
•
mathematical modeling
•
analysis
•
Design
This course will mainly deal with analysis, but will also cover mathematical modeling.
Designing systems is left for future courses.
Systems can also be classified as:
causal or noncausal
lumped or distributed
linear or nonlinear
time invariant or time varying
instantaneous (no memory) or dynamic analog or digital
stable or unstable
invertible or nonivertible
Continuous time (CT) systems accept CT signals and generates CT signals
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This note was uploaded on 02/06/2012 for the course EE 2120 taught by Professor Aravena during the Fall '08 term at LSU.
 Fall '08
 ARAVENA
 Volt

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