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Amplitude ModulationPart - 1
The AM waveform
Modulating factor (m)
Sidebands
Forms of Amplitude Mod.
power saving = 66.7% at 100%
modulation
For M = 1,power saved is 1/6
of the total transmitted power
•83.3 % power saving•50 % B.W.•Very small Power Supply•Narrow BPF limits the noise pick up
Generation of DSB-SC Signals
AM using linear devices
ωc ei(t)Bandpass
filterat ωc
eo(t)
Ring modulator
ei(t)
Bandpass filterat ωc
eo(t)
cosωct
f(t)
cosωct
1/2eR 1/2eR
D 1
D2
D 3
D4
a
b
ei(t)eo(t)
Double Ring modulator
THANKS !
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