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May 1998

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Subject:
Re: Frequency problems with FR-4
From:
"Gerald G. Gagnon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 21 May 1998 13:22:53 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (36 lines) 
Hello Mitch

You wrote:

Snip....

One thing we did was ask for impedance testing to be done to
200db levels instead of the standard 20db. This would show any and all
discontinuities along the traces.

Snip.....

Question: With the impedance measurement techniques I've seen, this
parameter is not mentioned. How does one determine
                     from a given procedure, the dB level of the
particular test they are running?

BTW, I agree with your assertion that FR4 can be used with significant
signal content in the 1Ghz range.

Regards

Gerry

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