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R&S AFQ100A
AFQ Commands - Signal Generation
1401.3084.32 6.47
E-3
[SOURce:]IMPairment:OFFSet:Q
The command sets a DC offset in the Q path from -0.1 FS to +0.1 FS ( = [-10% ...+10%] of the
digital signal). The accessible data range depends on the settings of the
Gain
in the Q path. After
entering the gain, the instrument calculates the accessible data range of the offset in order not to
output an amplitude exceeding 1.0 full scale.
Example:
IMP:OFFS:Q -0.10FS
'sets a negative DC offset to 10% FS.
*RST value
Resolution
Options
SCPI
0
0.1% FS
Device-specific
[SOURce:]IMPairment:PHASe
-20 ... +20 deg
The command sets an I/Q mismatch
from -20 deg to +20 deg, i.e. a deviation from 90 deg.
The impaired signals I
+
and Q
+
are given by the phase missmatch
and the proper ones I ,Q:
I
+
= I - q
i
× Q
Q
+
= q
q
× Q
with
q
i
=
)
sin(
q
q
=
)
cos(
Example:
IMP:PHAS -4.9DEG
'sets the phase mismatch to -4.9 deg.
*RST value
Resolution
Options
SCPI
0
0.1 deg
Device-specific
[SOURce:]IMPairment:STATe
ON | OFF
The command activates (On) and deactivates (Off) impairments.
Example:
IMP:STAT OFF
'deactivates impairment.
*RST value
Resolution
Options
SCPI
OFF -
Device-specific