December 2014
Intermediate to advanced
688 pages
18h 19m
English
Content preview from RF Power Amplifier, 2nd Edition
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1.22 Analog Modulation
A message signal 
is usually an LP signal. A signal whose spectrum is in the vicinity 
is usually called a baseband signal. A baseband signal is usually voice, video, or digital data signal. Modulation converts a message signal 
from an LP spectrum to a high-pass (HP) spectrum (usually to a BP spectrum) around a carrier frequency 
. In general, a modulated signal can be described as
1.154 
where the amplitude 
, the frequency 
, and the phase 
are modulated. Using the relationship 
, any narrow band signal can be presented as simultaneous AM and PM waveform
1.155
where
1.156 ...
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