RE: [SI-LIST] : RF boards

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From: Moran, Brian P (brian.p.moran@intel.com)
Date: Wed May 03 2000 - 14:41:07 PDT


Sal,

You are write that most vendors have optimized their process for certain
laminate suppliers. However, Nelco is a very popular material. GETEK vs
Nelco13 is a common tradeoff since GE is a terrible supplier, I understand.
In genreral I have always specified material as GETEK or equivalent, and let
the vendor make a case for his preference. If you are unsure get the
laminate specs and compare key parameters.

Brian P. Moran
Intel Corporation, FM6-45
1900 Praire City Road
Folsom, CA 95630
brian.p.moran@intel.com
(916) 356-1912

-----Original Message-----
From: Sal [mailto:saguinag@students.depaul.edu]
Sent: Wednesday, May 03, 2000 10:39 AM
To: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : RF boards

All,

Can some one address the issues associated with manufacturing,th The
producibility issues and how widely is Nelco used?

My experience so far, (and I'll admit it's little) is that board
manufacturers prefer to work certain materials and they have
"internal" processes that give them an advantage in manufacturing
for example IBM prefers to work with BT (in high speed digital
backplane applications, for example)).

When looking at different materials should we settle for what "our"
board
fabricator suggests, has more experience with, etc, etc?

Thanks,
-- _/~\\_

_____________________________________________
Above 1 Ghz dielectric loss dominates. The dielectric loss
tangent for the nelco is much better than the Getek. Since
the signal edges contain components several times the
data rate, high frequency losses will start closing the eye.

Ron

> > -----Original Message-----
> > From: Ron Miller [mailto:rmiller@Brocade.COM]
> > Sent: Friday, April 28, 2000 10:02 AM
> > To: 'si-list@silab.eng.sun.com'
> > Subject: RE: [SI-LIST] : RF boards
> >
> >
> > I have done some work substituting Arlon 350(teflon with
> > ceramic loading)
> > for FR4 and have
> > been able to double the bandwidth of previous generations.
> > Going from FR4
> > to Getek will
> > not get you much, but if you go to Nelco 4000-13SI, you can
> > expect a big
> > improvement in
> > the frequency dependent losses.
> >
> > Good luck
> > Ron Miller

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