Re: [SI-LIST] : Thin Power Plane Dielectrics

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From: Craig Twardy (ctwardy@nortelnetworks.com)
Date: Thu Oct 21 1999 - 06:51:49 PDT


Ray Anderson wrote:

> ctwardy@nortelnetworks.com comments:
>
> >
> > Does this mean ,for a given PCB size, I can increase the number of "points of consumption"
> > by a factor of 10 and maintain the same capacitance per "point of consumption"?
> >
> Yeah, I think so, if I understand your question...

that's it, thanks.

> Yes it will. This can also introduce problems in that you will
> end up having the board resonate at lower frequencies that it would have with lower Er
> dielectrics. This can cause EMI concerns at lower frequencies
> than you might traditonally expect. Also, the board resonance effects
> will begin to move down towards the frequencies that one usually thinks
> of as being primarily of SI concern. This can cause all manner of interesting
> effects.
>

such as?

> Actually it is an option today with some vendors offering alternate
> technologies in lieu of thin FR4. Half mil (or less) is in the realm
> of doability.
>

Sounds interesting..
Can you provide vendor and/or product names?

Craig Twardy
Nortel Networks

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