[SI-LIST] Re: PCB Corners - Need help finding research paper

Chris,


I wouldn't call it a *myth* but an *exaggeration*. I just ran a SONNET
simulation to confirm this. For the case of the microstrip I just modeled in
FR-4 the non-chamfered bend shows degraded performance above 15 GHz. This
corresponds to a 25 ps edge.



If one wants to account for every systematic effect in a system (I consider
this good practice) I recommend chamfered bends.



     Dave Cuthbert


On Fri, Aug 8, 2008 at 3:59 PM, Yuriy Shlepnev <shlepnev@xxxxxxxxxxxxx>wrote:

> Chris,
>
> Here is another investigation with comparisons of different 45-deg and
> 90-deg bends  - see App. Note #2007_3 at
> http://www.simberian.com/AppNotes.php
>
> Best regards,
> Yuriy Shlepnev
> www.simberian.com
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of Chris.McGrath@xxxxxxxx
> Sent: Friday, August 08, 2008 11:11 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] PCB Corners - Need help finding research paper
>
> I used to have a copy of a public paper that debunked the myth that stated
> the evils of using 90 degree corners when routing PCB traces.  I can't
> seem to find it on the web, so I'm hoping that one of you may either have
> a copy of it or can point me to the link.  Feel free to email me directly
> with the attachment since the SI List server will block it.
> Thanks!
> Chris
>
>
> -------------------------------------------------------
> Chris McGrath
> Applications Engineer
> chris.mcgrath@xxxxxxxx
> Office: 480.704.7061
> Blackberry: 480.747.3848
> www.smsc.com
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>
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