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12
Analog Signals
Classification of
Analog Signals
(1)
Simple Analog Signal
–
cannot be decomposed
into simpler signals
sinewave
–
most fundamental form of periodic
analog
signal
–
mathematically described with 3 parameters
(1.1)
peak amplitude
(A)
–
absolute value of signal’s
highest intensity
–
unit:
volts [V]
(1.2)
frequency
(f)
–
number of periods in one second
–
unit:
hertz [Hz] = [1/s]
–
inverse of period (T)
!
(1.3)
phase
(
φ
)
–
absolute position of the waveform
relative to an arbitrary origin
–
unit:
degrees [º]
or radians [rad]
(2)
Composite Analog Signal
–
composed of
multiple sinewaves
)
ft
sin(2
A
s(t)
π
A
T = 1/f
The origin is usually
taken as the last previous
passage through zero
from the negative to the
positive direction.
1[s]
0[s]