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DS90UB901Q and DS90UB902Q Bidirectional Control Channel

Hi,

My customer is using DS90UB901Q and DS90UB902Q.
He took waveform of the signal between DS90UB901Q and DS90UB902Q with differential probe.
Please see the attached file.

This waveform is shaking.
Is this correct?
This is measured with differential probe.

Best regards,
Shimizu