Am Concepts - Keysight X-Series Measurement Manual

Concepts

AM Concepts

AM Concepts

Figure 2-1 AM waveform
In AM (Amplitude Modulation), the instantaneous amplitude of the modulated
carrier signal changes in proportion to the instantaneous amplitude of the
information signal.
Figure 2-2 Calculation AM index in time and frequency domain
The modulation index "m" represents the amount of modulation or the degree
to which the information signal modulates the carrier signal. The index for an
AM signal can be calculated from the amplitudes of the carrier and either of
the sidebands by the equation:
Equation 2-1
m =
26
E E E E
– –
max c max
- - - - - - - - - - - - - - - - - = - - - - - - - - - - - - - - - - - - - - - - =
E E + E
c max
E + E
min USB LSB
- - - - - - - - - - - - - - - - - - - - - - =
E
min c
Keysight N9063C Analog Demod Measurement Guide
2E
SB
- - - - - - - - -
E
c