RE: [SI-LIST] : Upper limit of interplane capacitance

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From: Daniel, Erik S. (Daniel.Erik@mayo.edu)
Date: Thu Jun 15 2000 - 07:47:28 PDT


Greg-

Yes, the physical mechanism of dielectric loss is in fact related to
absorbtion resonances, and yes, this is why dielectric loss is independent
of geometry -- good observation. Just a comment on terminology, though -
this is not the "photoelectric effect" (which has to do with photons kicking
electrons out of a metal).

                                        - Erik

==================================================================
Erik Daniel, Ph.D. Mayo Foundation
Voice: (507) 284-1634 Guggenheim 1011B
Fax: (507) 284-9171 200 First Street SW
E-mail: daniel.erik@mayo.edu Rochester, MN 55905
==================================================================

> Larry and Erik,
>
> [Erik Daniel wrote]
> > I agree with most of your comments on power plane
> capacitance, but I have
> to
> > disagree with one point -- dielectric loss does NOT decrease with
> decreased
> > thickness of the dielectric -- dielectric loss is independent of the
> > dielectric thickness in particular, and all geometrical concerns in
> general
> > (unlike skin-effect loss).
>
> Someone once explained dielectric loss to me as absorption of
> the energy
> in the E/M field by quantum resonances in the molecules that
> make up the
> dielectric material. In my mind, I thought this sounded
> analogous to the
> photoelectric effect, where you shine light of a particular
> frequency on
> an atom and it gets absorbed if the frequency corresponds to
> one of its
> quantum states. Is this truly the physical origin of dielectric loss?
> If so, that would explain why it's strictly a material
> property and not
> geometry-dependent...
>
> Greg Edlund
> Advisory Engineer, Critical Net Analysis
> IBM
> 3605 Hwy. 52 N, Dept. HDC
> Rochester, MN 55901
> gedlund@us.ibm.com
>
>
>
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