Analog modulations
R&S
®
SMB100B
77User Manual 1178.3711.02 ─ 08
"High Bandwidth"
The maximum range for modulation bandwidth and PhiM deviation is
available.
However, phase noise increases at low frequencies, and the range of
PhiM deviation is limited. This mode is suitable if you process high
frequencies.
"High Deviation"
The maximum range for PhiM deviation is available.
Phase noise is improved for low frequencies compared to the default
mode. The range for modulation frequency is limited (see data sheet).
This mode is suitable for low modulation frequencies and/or high
PhiM deviation.
"Low Noise"
Frequency modulation with phase noise and spurious characteristics
close to CW mode. The range for modulation bandwidth and FM devi-
ation is reduced (see data sheet).
Remote command:
[:SOURce<hw>]:PM:MODE on page 425
AM settings
The following settings are dedicated to AM.
Depth ← AM settings
Determines the depth of the modulation signal in percent.
The depth is limited by the maximum peak envelope power (PEP).
Remote command:
[:SOURce<hw>]:AM<ch>[:DEPTh] on page 416
Sensitivity ← AM settings
Sets the input sensitivity of the external modulation signal.
Remote command:
[:SOURce<hw>]:AM<ch>:SENSitivity on page 417
Deviation Mode ← AM settings
Enables you to couple the LF signal of both paths and determines the mode for fixing
the total deviation.
The deviation sum of both paths is 100% in total. When the sum is exceeded, the
R&S SMB100B reports a settings conflict, but does not change the settings.
"Uncoupled"
Enables you to adjust the deviation depth for each path independ-
ently.
"Fixed Total"
Couples the deviation depth of both paths in per cent. If you change
the depth of any path, the R&S SMB100B automatically adjusts the
value of the other path. The sum always results in the set Total
Depth.
"Fixed Ratio"
Couples the deviation ratio of both paths. If you change the depth of
any path, the R&S SMB100B adjusts the value of the other path.
Modulation settings
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