iXBlue ModBox VNA, Руководство пользователя

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ModBox VNA – User’s Manual
Ref. Ed. B – 12/05/2020 24
Step Action
Figure 11: DG MBC Feedback tab
MAN/AUTO & DC Bias: This parameter allows the user to switch between
automatic and manual mode.
In manual mode, you can set the bias voltage manually using the following
DC Bias value parameter: you can set it between -10 V and 10 V.
In automatic mode, the system computes the bias voltage automatically: in
that case the bias value may not be manually adjusted. However, you can
initiate a rescan: the system will scan through the modulator’s bias voltage
values and restart the loop control.
In the case you want the system to be ran automatically, select AUTO for the
running mode.
•
QUAD-/QUAD+: select locking point Quad+ (positive slope) or Quad-
(negative slope).
• Save: Save MBC parameters so that they can be restored the next time
the ModBox is rebooted.
•
Rescan: Force the MBC to restart searching for a working point. The
MBC usually does this automatically after some operations.
• Dither Amplitude: This setting has been optimized to get the best
modulator’s performances . It should be equal to 3% of the modulator ’ s
V
π
DC.
• Dither Frequency: This setting has been optimized to get the best
modulator’s performances.