[SI-LIST] Re: EXT :Re: What's the purpose of stitching vias whichjust connect one GND layer?

  • From: Douglas Smith <doug@xxxxxxxxxx>
  • To: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
  • Date: Sat, 07 Nov 2015 20:34:22 -0500

No. I mean of course gnd layer to gnd layer vias to short out the z axis plane
to plane impedance at a signal via. That may be different than the stitching
vias discussed earlier, but I call these stitching vias as well.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 [tel:408-858-4528] Office:
702-570-6108 [tel:702-570-6108] Email: doug@xxxxxxxxxx Website:
http://dsmith.org

On Sat, Nov 7, 2015 at 20:20, Lee Ritchey <leeritchey@xxxxxxxxxxxxx> wrote:
Do you realize how nebulous that sounds?

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Douglas Smith
Sent: Saturday, November 7, 2015 5:27 AM
To: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
Cc: chris.cheng@xxxxxxx; Scott McMorrow <scott@xxxxxxxxxxxxx>; Shimko, Steve
(ES\) <s.shimko@xxxxxxx>; istvan.novak@xxxxxxxxxxx; dmarc-noreply@xxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx; bbakshan@xxxxxxxxx; Kevin.Hou@xxxxxxxxxx
Subject: [SI-LIST] Re: EXT :Re: What's the purpose of stitching vias whichjust
connect one GND layer?

Just to be clear, I was speaking of single or a few vias at places where a
signal changes many layers on a PCB, not for crosstalk control. The purpose is
to keep down emissions or increase immunity on a PCB.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 [tel:408-858-4528] Office:
702-570-6108 [tel:702-570-6108] Email: doug@xxxxxxxxxx Website:
http://dsmith.org

On Fri, Nov 6, 2015 at 19:08, Lee Ritchey <leeritchey@xxxxxxxxxxxxx> wrote:
Chris,

Well put!

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Cheng, Chris
Sent: Thursday, November 5, 2015 12:51 PM
To: doug@xxxxxxxxxx; Scott McMorrow <scott@xxxxxxxxxxxxx>; Shimko, Steve (ES)
<s.shimko@xxxxxxx>
Cc: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>; istvan.novak@xxxxxxxxxxx;
dmarc-noreply@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx; bbakshan@xxxxxxxxx;
Kevin.Hou@xxxxxxxxxx
Subject: [SI-LIST] Re: EXT :Re: What's the purpose of stitching vias whichjust
connect one GND layer?

Must have VIAs------Steve
No VIAs for you ------ Lee
Chris Cheng
Distinguished Technologist , Electrical
Hewlett-Packard Enterprise Company

+1 510 344 4439/ Tel
chris.cheng@xxxxxxx / Email
4209 Technology Dr
Fremont, CA 94538
USA



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Doug Smith
Sent: Thursday, November 05, 2015 11:58 AM
To: Scott McMorrow; Shimko, Steve (ES)
Cc: Lee Ritchey; istvan.novak@xxxxxxxxxxx; dmarc-noreply@xxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx; bbakshan@xxxxxxxxx; Kevin.Hou@xxxxxxxxxx
Subject: [SI-LIST] Re: EXT :Re: What's the purpose of stitching vias whichjust
connect one GND layer?

Can someone translate the characters below for me?

Doug
University of Oxford
Department for Continuing Education
Oxford, Oxfordshire, United Kingdom
--------------------------------------------------
Doug Smith
P.O. Box 60941
Boulder City, NV 89006-0941
TEL/FAX: 702-570-6108/570-6013
Mobile: 408-858-4528
Email: doug@xxxxxxxxxx
Web: http://www.dsmith.org
--------------------------------------------------


On Thu, 5 Nov 2015 19:45:03 +0000, "Shimko, Steve (ES)"
<s.shimko@xxxxxxx> wrote:
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