Signal Generator Settings
R&S
®
SGS100A
121User Manual 1173.9105.02 ─ 12
7.8.2 General I/Q Settings
► To access the settings of the I/Q modulator, select "SGMA-GUI > Instrument Name
> I/Q Settings > General".
Comprises the settings for setting the state and the analog wideband I/Q input.
Mod State
Switches the I/Q modulation on and off.
Remote command:
[:SOURce]:IQ:STATe on page 246
I/Q Wideband
Setting mode for wideband modulation signals (higher I/Q modulation bandwidth).
The modulation frequency response of the R&S SGS in the useful bandwidth is
improved at the expense of poorer harmonic suppression. This is achieved by shifting
the switching frequencies of the low pass filters in the output section.
Remote command:
[:SOURce]:IQ:WBSTate on page 248
Crest Factor
Sets the crest factor of the I/Q modulation signal.
The crest factor gives the difference in level between the peak envelope power (PEP)
and average power value (RMS) in dB. This value is necessary for the generation of
the correct output power at the RF output, i.e. the instrument uses the crest factor
value to compensate the average power.
In vector modulation mode, the output level setting is correlated to the nominal full
scale voltage at the I/Q input. If the baseband signal exhibits no constant envelope, the
instrument internal level setting can be corrected by use of the crest factor value.
Remote command:
[:SOURce]:IQ:CREStfactor on page 247
I/Q Modulation and Signal Impairment
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