ESG Family Signal Generators Hardkey and Softkey Reference
I/Q
User’s Guide 4-49
Q Offset
Press this softkey to enter an origin offset voltage for
internally-generated or externally-applied quadrature-phase signals.
Enter the value as a percentage of full scale (500 mV). The range of
values allowed is
−
100% to +100%. Change the origin offset to adjust
out imperfections in the quadrature-phase signal or to introduce
calibrated impairments. Set the origin offset as desired and then toggle
the
I/Q Adjustments Off On softkey to On.
Default Value: 0.0%
Softkey Location:
I/Q > I/Q Adjustments > Q Offset
Quadrature Skew
Press this softkey to adjust the phase angle between the I and Q
vectors. When the quadrature skew is zero, the phase angle is
90 degrees. Positive skew increases the angle from 90 degrees while
negative skew decreases the angle from 90 degrees. The range of values
allowed is
±
10 degrees with a minimum increment of 0.1 degrees.
However, if you’re operating the signal generator in the 3.3 to 4 GHz
frequency range, quadrature skew settings greater than
±
5 degrees will
not be within specifications.
Default Value: 0.0 deg
Softkey Location:
I/Q > I/Q Adjustments > Quadrature Skew
Revert to Default Cal Settings
Press this softkey to restore the original factory calibration data for the
internal I/Q modulator. The latest calibration data from the user
calibration is discarded. Although the factory calibration data may not
be optimized for the signal generator’s present status, the data can be
used as a starting point if the current data is lost (if the I/Q calibration
is unable to execute).
Softkey Location:
I/Q > I/Q Calibration > Revert to Default Cal Settings
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