Re: [SI-LIST] : MECL System Design Handbook

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From: Ritchey Lee (leeritchey@earthlink.net)
Date: Fri Jun 01 2001 - 10:10:51 PDT


My last reply should have been sent to Tom.

Dagostino, Tom wrote:

>
>
> I have a board that demostrates this very nicely. As soon as I get my
> scope/extraction system working again I will publish some results.
> The board is two layers with ground on one side and 50 Ohm traces on
> the other. Yes, these traces are quite wide, on the order of 0.100".
> There are several right angel bends with square corners. The corners
> are quite visible.
>
> Tom Dagostino
> Modeling Manger
> Mentor Graphics Corp.
> SAE
> tom_dagostino@mentor.com
> 503-685-1613
>
> -----Original Message-----
> From: Dr. Edward P. Sayre [mailto:esayre@nesa.com]
> Sent: Thursday, May 17, 2001 6:47 PM
> To: Ritchey Lee; Rich Peyton
> Cc: Roehrner Wolfgang; si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : MECL System Design Handbook
>
> Lee and others:
>
> I don't know what kind of TDR or fixturing you might have used, but
> the
> excess capacitance is very real and can be seen. It is also
> illustrated in
> a number of microwave books. If your fixturing caused a significant
> loss (>
> 100 ps) of risetime of the step out of the TDR, then the capacitance
> effect
> will be washed out.
>
> Sincerely,
>
> ed sayre
> ==========================
> At 08:36 AM 5/10/01 -0700, Ritchey Lee wrote:
> >Any of you who want to know how the myth about right angle bends got
> >started, look
> >at figure 7.17 on page 155. This alleges that right angle bends can
> be
> >seen by a
> >TDR. I've done this measurement dozens of times and coiuld never see
> a right
> >angle bend.
> >
> >A few years ago, I called Mr. Blood the author of the book and asked
>
> >about the
> >diagram. His reply was that he knew the diagram was flawed, but
> there
> >wasn't time
> >to fix it before the book went to press.
> >
> >As a result, thousands of engineers have spend countless time
> worrying
> >about right
> >angle bends.
> >
> >When we publish technical information such as this, it is important
> to
> >insure it
> >is accurate.
> >This applies especially to applications notes, whic often contain
> entirely
> >false
> >data.
> >
> >Lee
> >
> >Rich Peyton wrote:
> >
> > > FYI,
> > >
> > > The hard copy can be ordered free of charge.
> > >
> > > Rich
> > >
> > > Roehrner Wolfgang wrote:
> > >
> > > > http://www.onsemi.com/home <http://www.onsemi.com/home>
> > > >
> > > > In the Menu-tree go to:
> > > >
> > > > Technical Documents
> > > > CD/Document Ordering
> > > > General Search
> > > >
> > > > search for document number: hb205
> > > > download it as pdf (or order!).
> > > >
> > > > regards,
> > > > Wolfgang
> > > >
> > > > -----Original Message-----
> > > > From: Ashok Babu K [mailto:k.ashokbabu@gdatech.co.in]
> > > > Sent: Tuesday, April 10, 2001 12:39 PM
> > > > To: si-list@silab.eng.sun.com
> > > > Subject: [SI-LIST] : MECL System Design Handbook
> > > >
> > > > Hi all,
> > > > I see that a good resource for general high speed termination
> design and
> > > > especially ECL/PECL termination is Motorola's MECL System Design
>
> > Handbook by
> > > > Blood Jr., and William R. Many articles and papers specify the
> same as a
> > > > good resource. Unfortunately I could not get the soft copy of
> the MECL
> > > > System Design Handbook. I could not get it from the ON
> Semiconductor
> > > > website. If any of you have the PDF file of the same or know
> where it
> > can be
> > > > obtained, please inform me. Any suggestions of other resources
> are highly
> > > > welcome.
> > > > Regards,
> > > > Ashok.
> > > >
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>
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
> | NORTH EAST SYSTEMS ASSOCIATES, INC. |
> | ------------------------------------- |
> | "High Performance Engineering & Design" |
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
> | Dr. Ed Sayre e-mail: esayre@nesa.com |
> | NESA, Inc. http://www.nesa.com/ |
> | Primrose Park Tel +1.978.392-8787 |
> | 5 LAN Drive, Ste 200 Fax +1.978.392-8686 |
> | Westford, MA 01886 |
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
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