Before this adjustment is performed, the following adjustments must already be successfully completed:
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Before this adjustment is performed, the following adjustments must already be successfully completed: |
This adjustment optimizes the amount of deviation (skew) that can be used for offsetting I/Q impairment between the I and Q inputs.
I/Q impairment refers to the degree that the phase angle between I and Q signals deviate from the desired nominal value of 90 degrees. When using an external I/Q baseband source as inputs to the signal generator, the phase angle between the I and Q signals can have some inherent skew. The signal generator provides a front panel softkey function called “IQ Quadrature Skew” which allows up to +/–10 degrees of skew to be applied to the external baseband I/Q signal.
The values determined by this routine are applied to the Quadrature Error DAC.
Connect a GPIB cable between the controller and the signal generator being calibrated.
While performing this adjustment, follow all instructions on the controller display.
If this adjustment fails, perform the following steps in order:
Verify that the GPIB cable is connected between the controller and the signal generator being calibrated and rerun the adjustment.
If this adjustment still fails after step 1, perform "Low Band Digital Gain Calibration", "Low Band Digital Mixer Bias Calibration", " I/Q Modulator Calibration" and rerun the Adjustment.
If this adjustment still fails after step 2, refer to the troubleshooting section of the signal generator's service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight Website.
If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.
