Operating basics
40
AFG1022 Quick Start User Manual
Modulation waveform facts
and formulas
You can output frequency modulation or phase modulation waveforms in
the same way.
You can select an internal or external signal as an AM source.
You can select a modulation shape from the internal memory or USB memory.
You can only select sine, square, ramp, or arb as a carrier waveform.
The following equations show the output amplitude of AM, FM, and PM
modulation (in this example, sine waveform is used for carrier waveform
and modulation waveform):
AM: Output(V
p-p
)=
FM: Output(V
p-p
)=
PM: Output(V
p-p
)=
Carrier amplitude
A[V
p-p
]
Carrier frequency
fc [Hz]
Modulation frequency
fm [Hz]
Time
t [sec]
AM Modulation
depth
M [%]
FM Deviation
D [Hz]
PM Deviation
P [degree]
The following table shows relationship between modulation depth and
maximum amplitude for AM modulation waveform (internal modulation
source is selected):
Depth
Maximum amplitude
100%
A (V
p-p
)
50%
A (V
p-p
) * 0.75
0%
A (V
p-p
) * 0.50