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SDG7000A User Manual
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133
External
The modulation signal is external.
When the modulation type is analog modulation (AMB/DSB-SC/FM/PM/PWM
etc.), the external source is fed from the external modulation interface on the
rear panel. The amplitude of the input analog signal determines the modulation
factor (modulation depth/frequency deviation /phase deviation etc.).
The requirements for the external modulation amplitude are described in detail
in the datasheet parameter "Amplitude at 100% modulation". See Table 10.2 for
a description of the 100% modulation.
When the modulation type is digital key modulation (ASK/FSK/PSK etc.), the
external source is input from the trigger interface on the rear panel.
The input digital sequence must meet the electrical requirements of the trigger
input (see datasheet for details)
Channel
When the carrier is CH1, CH2 can be directly used as the modulating waveform.
In this case, the device directly uses CH2 to modulate CH1 internally without
introducing the waveform of CH2 to the external modulation interface through an
external cable. Vice versa.
Table 10-2 Description of 100% modulation
Description
AM
Corresponds to the case where modulation depth = 100%
FM
100% modulation is equal to the set frequency deviation. For example, if the
amplitude of the external modulation input is 50% of the corresponding
amplitude when 100% modulation is selected, the resulting frequency deviation
is 50% of the set frequency deviation.
PM
100% modulation is equal to the set phase deviation. For example, if the
amplitude of the external modulation input is 50% of the corresponding
amplitude when 100% modulation is selected, the resulting phase deviation is
50% of the set phase deviation.
10.2.2 Modulation Type
The following table shows the various modulation types supported by the SDG7000A and their
compatibility with carriers.
Table 10-3 Compatibility of modulation types with carriers
Carrier
Modulation
Sine
Square
Pulse
Ramp
Noise
AFG
AWG
AM
⚫
⚫
⚫
⚫
⚫
⚫
⚫
DSB-SC
⚫
⚫
⚫
⚫
⚫
⚫
⚫
FM
⚫
⚫
⚫
⚫
PM
⚫
⚫
⚫
⚫
PWM
⚫
FSK
⚫
⚫
⚫
⚫
ASK
⚫
⚫
⚫
⚫
⚫
⚫
⚫
PSK
⚫
⚫
⚫
⚫
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