Rohde & Schwarz SMBV100B, User Manual

Page: 281 / 1030

Applying I/Q Vector Modulation
R&S
®
SMBV100B
279 User Manual 1178.4460.02 ─ 03
System error correction of the I/Q modulator permits precise and repeatable measure-
ments.
If a temperature fluctuation of several degrees occurs, trigger the correction routine
using the following:
●
Select "I/Q Mod > I/Q Modulator > Adjust I/Q Modulator Current Frequency"
Settings:
State ............................................................................................................................279
Source .........................................................................................................................279
Adjust I/Q Modulator Current Frequency .................................................................... 279
I/Q Swap ..................................................................................................................... 280
I/Q Wideband .............................................................................................................. 280
Crest Factor ................................................................................................................ 281
Optimization Mode ...................................................................................................... 281
(Baseband) Gain ......................................................................................................... 281
State
Activates/deactivates I/Q modulation.
Note: Interdependency. If "Source > Internal Baseband", the I/Q modulator is always
activated automatically when signal generation is activated ("Baseband > State > On").
I/Q modulation can, however, be deactivated later, e.g. if the relevant signal is the
baseband signal and it is directly routed to the I/Q outputs.
Remote command:
[:SOURce<hw>]:IQ:STATe
on page 831
Source
Selects the input signal for the I/Q modulator. Refer to Table 5-1 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.
Remote command:
[:SOURce<hw>]:IQ:SOURce
on page 830
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 285.
Remote command:
:CALibration<hw>:IQModulator:LOCal?
on page 632
I/Q Modulator Settings