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Date: | Sat, 11 May 96 11:27:28 CST |
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Richard,
I understand that well. But, I'm more concerned about
dielectric material and frequencies up to about 30 GHz. FR4
is crap for our purposes beyond 800 MHz. We've seen a 1.5 dB
difference in signal from one side of the board to the other
in addition to variances from board to board.
I can't cost justify the ADDITION of "new materials" for
buried capacitance techniques against the REMOVAL of
decoupling capacitors achieving the same effect.
Your response is exactly in line with the way I am thinking
at this moment -
"keep the components, but, change the pcb stacking"
versus
"throw out the components, but, change to new material and
pcb stacking"?
The stacking may have to change in either case, so it's a
wash. Thus, it's a "components" versus "new material" issue
now.
This is actually the third part of the my other questions
concerning: 1. Humidity testing of printed circuit board
materials that was so vague, and, 2. Modeling frequency
response for a trace on a board that's getting it's share of
responses.
I'm looking for as much information as I can get.
And, again, I thank everyone for their input.
Doug McKean, [log in to unmask]
____________________ Reply Separator _______________________
Subject: Re: DES: New Material?
Author: "Richard Davidowsky"
<[log in to unmask]> at internet-mail
Date: 5/10/96 6:14 PM
Buried capacitance is achieved by the power and ground planes
being so close together they form a large plate capacitance.
The dielectric spacing between planes is very small, less
than 3 mils.
From: [log in to unmask]
Date: Fri, 10 May 96 14:19:25 CST
To: [log in to unmask], [log in to unmask]
Subject: DES: New Material?
Does anyone have any experience with "Buried Capacitance"
materials for p.c. boards?
Since I do alot of EMI/EMC control on products at the p.c.
board construction level. I'd like any input about this
stuff from the FIELD.
The Zycon Corp. calls it ZBC-2000.
I am NOT advertising this product.
Assume my frequency ranges out to 30 GHz.
Doug McKean, [log in to unmask]
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