Applying I/Q Vector Modulation
R&S
®
SMW200A
454User Manual 1175.6632.02 ─ 30
"High Quality Table"
This mode provides improved optimization while maintaining setting
time.
Select this mode if repeatable settings together with high quality opti-
mization also of wideband signals are required. The "High Quality
Table" mode is useful in the following cases:
●
If R&S SZU is connected to the R&S SMW and the connection is
active
See "To connect and configure an R&S SZU" on page 200.
●
In setup for the generation of phase-coherent signals
See Chapter 10.2, "Generating Phase-Coherent Signals",
on page 639.
●
In DPD setups
See user manual R&S SMW-K540, R&S SMW-K541 Envelope Track-
ing and AM/AM, AM/PM Predistortion.
"High Quality"
With "Source > Internal Baseband", enables an optimization by com-
pensation for I/Q skew and frequency response correction.
This mode generates flat signal over large bandwidth but requires
longer setting time and leads to signal interruption.
Note:
Do not use the mode "I/Q Modulator > Optimization Mode > High
Quality" in combination with the modes "RF Level > Setting Charac-
teristics > Uninterrupted/Strictly Monotone".
The high quality I/Q optimization leads to RF signal interruption. The
requirements of the RF level modes "Uninterrupted" and "Strictly
Monotone" can not be fulfilled.
Remote command:
[:SOURce<hw>]:BB:IMPairment:OPTimization:MODE on page 1103
Linearize RF
Option: R&S SMW-K541
Enables an automatic AM/AM predistortion of the non-linear RF chain.
During RF linearization, disables "Digital Predistortions AM/AM and AM/PM" settings.
Remote command:
[:SOURce<hw>]:IQ:DPD:LRF:STATe
See user manual R&S®SMW-K540, R&S®SMW-K541 Envelope Tracking and AM/AM,
AM/PM Predistortion.
Adjust Linearization Current Frequency
Calculates the correction data for the currently selected frequency.
During RF linearization, disables "Digital Predistortions AM/AM and AM/PM" settings.
Remote command:
[:SOURce<hw>]:IQ:DPD:LRF:ADJust
See user manual R&S®SMW-K540, R&S®SMW-K541 Envelope Tracking and AM/AM,
AM/PM Predistortion.
I/Q Modulator Settings
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