Instrument Function
R&S
®
SMBV100A
246Operating Manual 1407.6062.32 ─ 08
Fig. 5-8: Effect of a negative quadrature offset
SCPI command:
[:SOURce<hw>]:IQ:IMPairment:QUADrature:[ANGLe] on page 638
5.5.2.3 I/Q Swap and I/Q Wideband
The I/Q control can be swapped and the optimized setting for wideband signals can be
selected in the middle section of the menu.
I/Q-Swap - I/Q Mod
Selects normal or swapped I/Q control for an external analog signal. The modulation
sidebands are inverted by swapping the I and Q signals.
This parameter enables I/Q modulation to be performed on signals according to IS2000
(cdma2000 standard) and the majority of all other standards. As a result, an I/Q demod-
ulator defined according to IS2000 can also be used for demodulating the generated
signals.
The I/Q modulator defined in the IS2000 standard differs from the definition in the R&S
Signal Generator. The definition on which the R&S Signal Generator is based is used by
virtually all digital communication standards (except IS95 and IS2000).
In the final step, the filtered I/Q signal is modulated to the desired RF in a different way
in the I/Q modulator:
I/Q Modulation - I/Q Mod Block
To Next Page
Loading...
