Applying I/Q Vector Modulation
R&S
®
SMW200A
453User Manual 1175.6632.02 ─ 30
In instruments equipped with one of the High frequency options and for "Freq > 19.5
GHz", this parameter is disabled.
See also Chapter 7.4, "How to Adjust the I/Q Modulator to Optimize Performance",
on page 455.
"-4 dB/- 2 dB (Low Distortion)"
Activates -4 dB or -2 dB gain.
Baseband signal is internally attenuated to minimize signal distor-
tions; the intermodulation characteristics of signal are optimized, the
SNR however decreases.
"0 dB"
No changes on the baseband signal; optimization is not applied.
"+2 dB/ +4 dB/ + 6 dB/ + 8 dB (Low Noise)"
Activates a 2 dB, 4 dB, 6 dB or 8 dB gain
Baseband signal is internally boosted to maximize the SNR; signal
noise is minimized, the signal distortions however increase.
These values are suitable for 3GPP signals with high adjacent chan-
nel power ratio (ACPR).
"Auto"
The gain value is retrieved form the connected R&S SZU. The I/Q
modulator is configured automatically.
Remote command:
For analog I/Q signal:
[:SOURce<hw>]:IQ:GAIN on page 1137
For digital I/Q signal:
[:SOURce<hw>]:BB:IQGain on page 1137
Optimization Mode
Selects the optimization mode.
For information on the I/Q modulation performance in any of the modes, see the data
sheet.
The value selected here is used also as optimization mode for the user-defined fre-
quency response corrections, and vice versa.
See user manual R&S SMW-K544 User-Defined Frequency Response Correction.
"Fast"
Fast optimization by compensation for I/Q skew.
This mode is suitable in time sensitive environments and narrowband
signal.
I/Q Modulator Settings
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