User`s guide

3-134 Agilent E6432A Microwave Synthesizer User’s Guide

Soft Front Panel Help

I/Q Calibration (Option UNG Only)

Adjustments to Vblo Setting (I/Q mixer bias) on the I/Q Calibration

dialog box can minimize the conversion loss and improve the IM

performance. The factory default value of DAC value 2048 is mid-range

for the DAC adjustment and is normally a good compromise. The

I/Q Calibration must be performed each time that the Vblo setting is

changed.

Optimizing Error Vector Magnitude (EVM) Measurements

After completing an I/Q Calibration and IF Upconverter Calibration,

set the IF Upconverter Attenuator to 12 dB. This can be accomplished

by increasing the ALC power up 12 dB. For example, the ALC power

could be adjusted from 0 dBm to 12 dBm. This would result in the same

output power, but with improved EVM.