[SI-LIST] Re: 90 degree bend
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Jean Audet" <jaudet@xxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 31 Aug 2004 09:48:19 -0700
What kind of manufacturing process necks traces down going into corners?
Lee W. Ritchey
Speeding Edge
P. O. Box 2194
Glen Ellen, CA 95442
Phone- 707-568-3983
FAX- 707-568-3504
I just used the energy it took to be angry to write some blues.
Count Basie
> [Original Message]
> From: Jean Audet <jaudet@xxxxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 8/30/2004 10:19:33 AM
> Subject: Re: [SI-LIST] Re: 90 degree bend
>
>
>
>
>
> OOPS.... you are rigth for PCB traces where the lines are wide.. the
> over-etching should not be a problem..... BUT From a module perspective,
> where the line width can be at 20um wide, the a 90 degree bend may reduce
> the substrate yield because you may neck down the line width into the
> corner and consequently does not meet the design spec. Also from a
> reliability point of view, this neck down will be a weak point.
>
>
>
>
>
> Jean Audet
> Electrical Analysis
> World Wide Packaging & Test
> IBM Burlington
> Tel: 802-769-0835, tie line: 446-0835
> Tel: 450-534-6317, tie line: 552-6317
> E-mail: jaudet@xxxxxxxxxx
>
>
>
>
> "Lee Ritchey"
> <leeritchey@earth To: "Andrew
Ingraham" <a.ingraham@xxxxxxxx>, si-list@xxxxxxxxxxxxx
> link.net> cc:
> Sent by: Subject: [SI-LIST] Re: 90
degree bend
> si-list-bounce@fr
> eelists.org
>
>
> 08/30/2004 12:40
> PM
> Please respond to
> leeritchey
>
>
>
>
>
> This is another of those statements that are not true and should not be
> repeated. Where did this one start?
>
> I use right angle bends in every signal, or rather, I allow them, even 2.4
> GB/S.
>
> How long will it take to get the misinformation purged from our
profession?
>
> Lee W. Ritchey
> Speeding Edge
> P. O. Box 2194
> Glen Ellen, CA 95442
> Phone- 707-568-3983
> FAX- 707-568-3504
>
> I just used the energy it took to be angry to write some blues.
> Count Basie
>
>
> > [Original Message]
> > From: Andrew Ingraham <a.ingraham@xxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 8/30/2004 9:13:51 AM
> > Subject: [SI-LIST] Re: 90 degree bend
> >
> > The other problem is that right-angle bends tend to concentrate etchant
> and
> > may result in over-etching the trace a bit in the corner. Presumably it
> can
> > lead to a break in the trace.
> >
> > For most of us, that's the reason why we don't use right-angle corners.
> The
> > electrical effects become noticeable if you're doing multi-GHz boards.
> >
> > Regards,
> > Andy
> >
> >
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