Vblo mixer bias calibration, Description, Required test equipment – Agilent Technologies E4438C User Manual
Page 121: Procedure, Vblo mixer bias calibration -29, Description -29, Required test equipment -29, Procedure -29
Adjustments
VBLO Mixer Bias Calibration
4- 29
VBLO Mixer Bias Calibration
Description
This calibration adjusts the VBLO MIXER BIAS DAC on the A13 Output. This DAC is used to control the
bias voltage to the internal mixers. This DAC is primarily used to adjust the mixer bias for optimum I/Q
modulation linearity, but it has a secondary influence on mixer gain. This calibration ensures that there will
be sufficient power available through the mixers to perform the desired modulation while minimizing
intermodulation distortion when the digital modulation is activated. After adjustment, the results are stored
in the signal generator’s firmware.
Required Test Equipment
• None
Procedure
1. Preset the signal generator.
2. Follow the instructions as they appear on the controller’s display.