Applying I/Q Vector Modulation
R&S
®
SMW200A
450User Manual 1175.6632.02 ─ 30
3. To define the external analog signal, select "Source > Differential Analog I/Q Input".
The dialog comprises the I/Q modulator settings, the optimized settings for wide-
band modulation and settings for enabling the analog and/or digital impairments.
The dialog comprises the I/Q modulator settings and settings for enabling digital
impairments.
The remote commands required to define these settings are described in Chap-
ter 14.19.9, "SOURce:IQ Subsystem", on page 1136.
For a description on the signal impairment functionality and settings for applying
non-linear effects, see:
● Chapter 6.4, "Impairing the Signal", on page 439
See user manual R&S SMW-K540, R&S SMW-K541 Envelope Tracking and
AM/AM, AM/PM Predistortion.
See user manual R&S SMW-K544 User-Defined Frequency Response Correction.
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"
●
Or select "System Config > Setup > General > Internal Adjustment > Adjust I/Q
Modulator Current Frequency".
See also Chapter 17.3.3.2, "How to Use the Internal Adjustments", on page 1282.
Settings:
State............................................................................................................................450
Source.........................................................................................................................451
Adjust I/Q Modulator Current Frequency.................................................................... 451
I/Q Swap..................................................................................................................... 451
I/Q Wideband.............................................................................................................. 452
Crest Factor................................................................................................................ 452
Baseband Gain........................................................................................................... 452
Optimization Mode...................................................................................................... 453
Linearize RF................................................................................................................454
Adjust Linearization Current Frequency......................................................................454
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 1137
I/Q Modulator Settings
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