Applying I/Q Vector Modulation
R&S
®
SMW200A
451User Manual 1175.6632.02 ─ 30
Source
Selects the input signal for the I/Q modulator. Refer to Table 7-1 for an overview of the
possible input signals and the connectors they are supplied at.
"Internal Baseband"
Selects the internal baseband signal.
"Analog Wideband I/Q Input"
Selects an external analog signal.
See also "To apply an external analog signal directly to the I/Q modu-
lator" on page 213.
"Differential Analog I/Q Input"
Option: R&S SMW-K739, for RF path A.
Selects an external differential analog signal.
If the instrument is equipped with one of the High frequency options
and a "Freq > 19.5 GHz" is selected, the "Analog Wideband I/Q Input"
is automatically selected.
Remote command:
[:SOURce<hw>]:IQ:SOURce on page 1137
Adjust I/Q Modulator Current Frequency
Starts the adjustment for the I/Q modulator for the currently set frequency and base-
band gain. The I/Q modulator is adjusted regarding carrier leakage, I/Q imbalance and
quadrature.
See also "To trigger the internal correction routine of the I/Q modulator" on page 456.
Remote command:
:CALibration<hw>:IQModulator:LOCal? on page 866
I/Q Swap
Selects normal or swapped I/Q control for the generated signal.
The I/Q modulator defined in the IS2000 standard differs from the definition in this
implementation. The definition on which the implementation is based is used by virtu-
ally all digital communication standards, except IS95 and IS2000.
In the final step, the filtered IQ signal is modulated to the desired RF in a different way
in the I/Q modulator:
Figure 7-1: Definition of I/Q modulator in IS2000 and the R&S
SMW
I/Q Modulator Settings
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