Instrument Function
R&S
®
SMU200A
279Operating Manual 1007.9845.32 ─ 15
State - I/Q Mod
Activates/deactivates I/Q modulation.
If "Analog Wideband I/Q In" is selected, the I/Q modulator is also deactivated and acti-
vated.
If "Internal Baseband I/Q In" is selected, the I/Q modulator is always activated automat-
ically as soon as signal generation is activated in the "Baseband" block. It can, however,
be deactivated later, e.g. if only the baseband signal which is output at the I/Q outputs is
relevant.
SCPI command:
[:SOURce<hw>]:IQ:STATe on page 726
5.6.2.2 Impairements
I/Q impairment for specific impairment of the I/Q modulation is set in the "Impairments"
section.
State - Impairments I/Q Mod
Activates/deactivates I/Q impairment.
If activated, the settings for leakage, I/Q imbalance and quadrature offset become effec-
tive.
Whether or not I/Q impairment is activated is indicated in the function block.
Note: It is advisable to switch automatic level control to the Sample&Hold mode, as oth-
erwise level errors may occur (see chapter 5.5.8, "Automatic Level Control - ALC",
on page 221).
SCPI command:
[:SOURce<hw>]:IQ:IMPairment[:STATe] on page 725
Offset - I/Q Mod
Sets the carrier offset (in percent) of the amplitudes (scaled to the peak envelope power
(PEP) for the I and/or Q signal component.
An ideal I/Q modulator suppresses the carrier offset completely (offset = 0 percent). If an
offset value is entered for a component, a carrier offset with fixed amplitude is added to
the signal. In the diagram, all I values or Q values are offset by a fixed amplitude value
depending on the entered percentage.
I/Q Modulation - I/Q Mod Block
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