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Operating Basics
AFG3000 Series Quick Start User Manual
47
■ You can select an internal or external signal as an AM source. If you select an external source and set the modulation
depth to 120%, the output will be at the maximum amplitude when a ±1 V
p-p
signal is applied to the rear panel EXT
MODULATION INPUT connector.
■ You can select a modulation shape from the internal memory or USB memory.
■ 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):
■ The following table shows relationship between modulation depth and maximum amplitude for AM modulation waveform
(internal modulation source is selected):
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]
Depth Maximum amplitude
120% A (V
p-p
)
100% A (V
p-p
) * 0.909
50% A (V
p-p
) * 0.682
0% A (V
p-p
) * 0.455
AM: Output(Vp-p)=
A
2.2
-------- 1
M
100
----------2πfmt()sin+
⎝⎠
⎛⎞
2πfct()sin
FM: Output(Vp-p)=A 2π fc D 2πfmt()sin+()t()sin
PM: Output(Vp-p)=A 2πfct 2π
P
360
----------2πfmt()sin+
⎝⎠
⎛⎞
sin