FreeLists / si-list / [SI-LIST] Re: Differential Signals with changed ground references

["韩国兵" <han.guobing@xxxxxxxxx>]

Hi ryansatrom,
   I think it depends. It may cause mismatch issues since the characteristic
impedance will change when the ground reference is changed.

Regards,
Robin




2008/2/27, ryansatrom <ryan.satrom@xxxxxxxxxxx>:
>
> I am currently trying to determine the performance of an interface
> where the PCB ground planes and the device grounds are not tied
> together (except on the very outside of the PCB).
>
> I recognize this is a design flaw (I didn't design the PCB), and I also
> recognize that this causes floating signals for all single-ended
> signals.
>
> However, my intuition tells me that the differential signals would
> perform okay (ignoring any failures due to PDS - strictly from a signal
> integrity perspective).
>
> Am I correct in this assumption?  Or would it be based on the device
> design and how the device reads the differential inputs/outputs?
>
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