[SI-LIST] Re: High Speed PCB design standards
- From: Nick Paulter <paulter@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 07 Jul 2004 13:24:34 -0400
I have a couple of comments regarding L. Ritchey's e-mail.
1. The IPC-2141A is not a standard, it is a guide, therefore, it is
instructional/informative and not normative.
2. "Rule of thumb" appears in 4 different paragraphs, regarding:
1. maximum number of signal pins per ground pin
2. when should a transmission line be considered a lumped or
distributed element
3. separation of signal conductors of controlled impedance lines
from ground/reference planes on the same plane
4. width of the reference plane relative to that of the signal line
3. "Rule of thumb," "common knowledge," "general rule," "common practice"
are all somewhat similar terms that have the purpose of providing guidance.
4. The members of the IPC working group (D-21c) that rewrote the IPC-2141
are experts in what they do. I doubt very much if these people would want
to have incorrect statements in the document.
5. The IPC-2141 was reviewed by experts outside of the D-21c.
I'm sorry if I wasted your time with this e-mail, but the unfortunate
comment may have inappropriately denigrated the work of the D-21c members,
which is not acceptable.
Regards,
N.G. Paulter, Project Leader
Pulse Metrology and Time Domain Measurements
Mail Stop 8172
National Institute of Standards and Technology
Gaithersburg, MD 20899
301-975-2405
At 08:16 AM 7/5/2004 -0700, you wrote:
>Unfortunately, this standard has an excessively large number of "Rules of
>thumb" which are not correct. I'd advise reading it with a great deal of
>caution.
>
>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: Nilesh Kawadkar <nileshkawadkar@xxxxxxxxx>
> > To: <vishnu.jwalapuram@xxxxxxxxx>
> > Cc: <si-list@xxxxxxxxxxxxx>
> > Date: 7/5/2004 3:03:30 AM
> > Subject: [SI-LIST] Re: High Speed PCB design standards
> >
> > Hello Vishnu,
> >
> > IPC-2141 is a standard developed by the institute for Interconnecting and
>Packaging Electronic circuits.This is a standard which i think will be
>helpfull to you.
> >
> > Other then this i have never come across any such standard for high speed
>PCB design.
> >
> > There are a lot of application notes,whitepapers and documents available
>on internet.
> >
> > Best Regards
> >
> > Nilesh Kawadkar
> >
> >
> >
> > vishnu.jwalapuram@xxxxxxxxx wrote:
> > Hi,
> > I am in hunt for buying some high speed PCB design standards.
> > I am ware of IPC standards.
> > Do anyone know any other design standards that are specifically meant
> > for High Speed Board designers ?
> >
> >
> > Thanks,
> > Vishnu
> >
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