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FM Bandwidth
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Bandwidth of
FM signal (modulated signal) = 10 * bandwidth
of
modulating signal
Significant
spectrum of FM audio = 15 KHz
⇒
Minimum 150 KHz bandwidth
FM
Band
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Example 5.19
We
have an Audio signal with a BW of 4 MHz. What is the BW needed if we modulate
the
signal using FM?
Solution:
-BW = 10 * 4
MHz = 40 MHz
ƒ Phase modulation (PM)
o Simpler hardware requirements
o Phase is modulated with the amplitude
o Amplitude & Frequency of the carrier
signal remain constant
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