[SI-LIST] Re: HIGH DC Current on GND Plane

*Joe*
60 Amps DC is not a very high current for large backplanes, and I have used
100s of XAUI ( 3,125 Gbps ) serdes lines in backplanes carrying 60+ Amps DC
on mutliple planes.

Air, FR4 and Cu do not saturate for this magnitude of current.

How did you conclude the mutual inductance will be absent?

Make sure you use multiple planes for 60 Amps and not on single plane,
thicker copper planes need a larger spacing and chance of copper fully void
out in dense connector pin fields. use multiple <2 Oz cu planes.

Regards
Saravana


On 6/16/07, Joe Paul M <joepaulm@xxxxxxxxx> wrote:
>
>
>
> I have a midplane carrying 60Amps of current and Same GND plane is used
> as reference for multiple of 6.6 Ghz serdes lines , PCI-e lines and GE
> lines
> Is there anything similar to 'saturation' in Inductors applicable to GND
> plane?
> ( Due to saturation of flux in the flux carrying medium , beyond a
> certain amount of DC current inductors saturate and wont act as
> inductors for any AC superimposed on the DC. )
> Will cross talk increase due to the absence of mutual inductance between
> signals and gnd plane ?
> Is there anything else that can go wrong due to this DC , AC current
> mixing in planes ??
>
>
>
>
>
>
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