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

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From: Vinu Arumugham (vinu@cisco.com)
Date: Thu Jun 15 2000 - 09:46:03 PDT


Larry Smith wrote:

> Greg - it is a bit of a stretch, but if I go back to my Quantum
> Mechanics from years ago, I think the dielectric loss is more of
> a sonic phenenon than a photo electric effect. With the photo
> electric effect, a packet of energy is obsorbed that is exactly
> right to lift an electron from one energy state to another. When
> the electron falls back it emits a photon.
>

Is the photoelectric effect not the more specific case where the energy absorbed
by an electron is sufficient to free the electron from the metal lattice? There
is no falling back to the previous energy state.

>
> With dielectric loss, molecules physicaly vibrate more like a
> sound wave. The losses show up as thermal rather than electromagnetic
> energy.

Is thermal energy not a form of electromagnetic energy?!

> But you are correct, dielectric loss is a material property.
>
> I'm sure somebody will tell me if this is completely off base...
>
> regards,
> Larry Smith
> Sun Microsystems
>
> > From: gedlund@us.ibm.com
> > X-Lotus-FromDomain: IBMUS
> > To: si-list@silab.eng.sun.com
> > Date: Thu, 15 Jun 2000 09:23:26 -0500
> > Subject: RE: [SI-LIST] : Upper limit of interplane capacitance
> > Mime-Version: 1.0
> > Content-Disposition: inline
> >
> > 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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