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SDG7000A User Manual
WWW.SIGLENT.COM 71 /
133
Shape
Same as AM
Phase deviation
The maximum value Δ𝜑 of the instantaneous phase deviation from the
instantaneous phase 𝜑
c
(
t
)
when the carrier is not modulated. The
maximum phase deviation corresponds to the maximum or minimum
value of the modulating waveform amplitude. The phase of the
modulated waveform is at varies over a range of
( )
c
t
When the source is internal or channel, the value can be set directly;
when the source is external, it is determined by the amplitude of the
external modulation input. The full amplitude of the external modulation
waveform corresponds to the set phase deviation.
PWM
PWM, pulse width modulation, is only applicable when the carrier is pulse and refers to the
modulation method where the amplitude of the modulating waveform is used to control the
positive pulse width of the carrier.
The parameters that can be set for the PWM are listed in the table below.
Table 10-8 Description of PWM Modulation Parameters
PWM
PWM frequency
Same as AM
Shape
Same as AM
Pulse width
deviation
The maximum deviation of the positive pulse width from the positive
pulse width without modulation corresponds to the maximum or
minimum value of the modulating waveform amplitude.
When the source is internal or channel, this value can be set directly.
When the source is external, modulated by external
The full amplitude of the external modulation waveform corresponds to
the set pulse width deviation.
ASK
ASK is amplitude keying, here refers to binary amplitude keying. The amplitude of the carrier
being modulated varies with the 1/0 state of the binary sequence, i.e. the presence or absence
of the carrier amplitude is used to represent a 1 or a 0.
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