RE: [SI-LIST] : Possible TDR microstrip measurement error?

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From: Dave Hoover (dave_hoover@yahoo.com)
Date: Thu Nov 02 2000 - 21:48:27 PST


John said:
> Here's a question I have to this panel, specifically
> toward any members of
> the audience that may work in the board
> manufacturing industry. Instead of
> providing us with a simple stack up proposal that
> contains little more
> information than line width, tolerances, and Zo, why
> not provide us with a
> full set of RLGC parameters instead. This would make
> my life a lot easier.
> Of course, this would require a big investment on
> their part, but I believe
> that future high speed designs will need this type
> of information early on
> in the design process.
'snip

John,

This may be in the near future. There already is a
hand full of fabricators out there capable of this
right now. The issue is (as you've outlined) it
requires a pretty decent investment in a software
package and someone competent enough to understand
what it calculates. As the "one stop shop" approach
becomes more prolific (fab, assembly, and design
acquisitions and mergers), we will see more
engineering
services offered. Some of these big guys (getting
bigger) understand this stuff better and have the
available cash flow to support it.

Dave Hoover (a fab guy)

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