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

About this list Date view Thread view Subject view Author view

From: Craig Twardy ([email protected])
Date: Thu Oct 21 1999 - 06:51:49 PDT

Ray Anderson wrote:

> [email protected] 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

**** To unsubscribe from si-list: send e-mail to [email protected] In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at ****

About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 11:39:17 PST