[SI-LIST] Re: One stitching via or more vias is better for 25Gbps

  • From: David Banas <DBanas@xxxxxxxxxx>
  • To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 8 Sep 2014 14:38:15 +0000

On 9/7/2014 8:49 PM, leeritchey@xxxxxxxxxxxxx<mailto:leeritchey@xxxxxxxxxxxxx> 
wrote:
> All of the things proposed don't seem to have any basis.  I, on the

> other hand, have built test boards to find out.  My findings are

> available in my classes and do not show such vias have any value.

>

Hi Lee,

Our simulation results suggest that, while these stitching vias have no 
discernable effect on signal integrity at the receiver at these speeds, they do 
noticeably affect electromagnetic emissions from the PCB edges, potentially 
threatening electromagnetic compliance testing failure, when they are omitted. 
And I was wondering if you have any experimental findings, in this regard, that 
you can share.

Thanks!

David Banas
Sr. Member of the Technical Staff
Altera Corp.<http://www.altera.com/>


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