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

Dave,
You fail to mention the dimensions you simulated.  What were they?
Bill 

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx 
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of DAVID CUTHBERT
> Sent: Friday, August 08, 2008 6:59 PM
> To: Yuriy Shlepnev
> Cc: Chris.McGrath@xxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [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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