FreeLists / si-list / [SI-LIST] Re: Differential pair via modeling

["Doug Hopperstad" <doug.hopperstad@xxxxxxxxxx>]

Hi all,
I am looking for some information on differential via modeling. The
differential nets travel through via holes between non-adjacent layers.
A return stitch is typically placed near the layer jump via to provide a
return path for single-ended nets. With differential pairs, the
common-mode signal would need a return path but I am not finding any
information on how to calculate the anti-pad size, placement of the vias
and return stitch for differential nets.=20

I have been reading Howard Johnson's latest book on via modeling but it
only talks about single-ended vias.=20

Can someone provide a good reference source on this issue, thanks.

Doug Hopperstad
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