Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 261
Baseband Generators
A2 Vector BBG Assembly Troubleshooting
I/Q Related Adjustments
There are eight I/Q related adjustments in the performance verification and
adjustment software. They are:
1. IQ Abus Calibration
Corrects the imperfections in the internal ABUS on the A2 Vector BBG
assembly. This should be run before running any I/Q related adjustments.
2. IQ Prelevel Calibration
Adjusts the LO drive level to the I/Q modulator. This adjustment requires
that the RF power level coming from the A3 RF assembly to the A2 Vector
BBG assembly be at the correct level.
3. IQ VBLO Calibration
Adjusts the bias level for the mixers within the I/Q modulator. This is done
to minimize distortion in the mixers within the modulator.
4. IQ Calibration
Minimizes imperfections in the IQ System to deliver optimal performance
at the RF output connector and the baseband IQ output connectors. It also
provides a calibrated input at the IQ input connectors and calibrates the IQ
System impairments.
5. IQ Channel Flatness Coarse Calibration
6. IQ Skew Calibration SA
7. IQ Channel Flatness Fine Calibration
8. IQ Channel Flatness Calibration PM
These four adjustments all have the same goal and should always be run
as a set. They are used to generate the IQ magnitude and phase correction
data required to flatten the frequency response of the system from the
output of the IQ DACs, through the analog IQ baseband system, through IQ
Modulator inputs, to the RF output connector.
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