I have already built dozens of test PCBs. I think the burden is on those
making the claims to show that this is a real problem with real boards
rather than visible on a test PCB.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of heyfitch (Redacted sender "heyfitch" for DMARC)
Sent: Wednesday, December 7, 2016 5:26 PM
To: leeritchey <leeritchey@xxxxxxxxxxxxx>; shlepnev@xxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: XTalk power flow in differential vias
You are free to design your own test board to convince yourself one way or
another. Right?
- VadimÂ
On Wednesday, December 7, 2016, 17:01, leeritchey <leeritchey@xxxxxxxxxxxxx>
wrote:
Cadin, I do design with hundeds of channels densely packed. Â There is no
room for "stitching vias'. Â These all work very well. Â You will find this
the norm with big iron.
Maybe stitching vias are over kill. To use them I would have to be shown
that their effect is significant rather than just visible .
Sent via the Samsung Galaxy S® 6, an AT&T 4G LTE smartphone--------
Original message --------
From: heyfitch <heyfitch@xxxxxxxxx>
Date: 12/06/2016 8:36 PM (GMT-08:00)
To: leeritchey@xxxxxxxxxxxxx, shlepnev@xxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: XTalk power flow in differential vias
blockquote, div.yahoo_quoted {margin-left:0 !important;border-left:1px
#715FFA solid !important;padding-left:1ex
!important;background-color:white;}Lee,In fiber optics modules, for example,
the density is so high that diff vias are often right next to one another.
 The natural inclination is to have as few stitching vias as possible - to
have more routing channels. Â So, 2 stitching vias per a diff via is
typical. Â Yuriy's video clearly shows how the lower number of stitching
vias result into higher insertion loss. Â This is a trade off consideration,
imho. Also, it is desired to have less than 40dB crosstalk between
channels. That is another consideration. Regards,Vadim Heyfitch
On Monday, December 5, 2016, 13:49, Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
wrote:
Why are we worrying about differential vias?
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Yuriy Shlepnev
Sent: Monday, December 5, 2016 11:58 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] XTalk power flow in differential vias
Hello Everyone,
Last Friday I have uploaded visualization of crosstalk power flow in
differential vias - see #2016_13 at http://www.simberian.com/ScreenCasts.php
 -> How Interconnects Work (higher quality, but may be slow), YouTube
version is available at https://youtu.be/IyuQIl8T_uE The demo video
illustrates two ways for the crosstalk reduction. I was really fascinated
with the power flow view of the crosstalk :-) As always, I will appreciate
any feedback.
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
2629 Townsgate Rd., Suite #235, Westlake Village, CA 91361, USA Office
+1-702-876-2882; Fax +1-702-482-7903 Cell +1-206-409-2368; Virtual
+1-408-627-7706
Skype: shlepnev
www.simberian.com
Simbeor - Accurate, Productive and Cost-Effective Electromagnetic Signal
Integrity Software
2010 and 2011 DesignVision Award Winner, 2015 Best In Design&Test Finalist
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