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

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From: Kai Keskinen (keskinen@nortelnetworks.com)
Date: Thu Jun 15 2000 - 10:23:20 PDT


Hi Brian:

There is a program available from GE called W-flux that solves the
parameters for single and coupled microstrip and stripline geometries (2-D).
I know that there are some spreadsheets available from some of the SI list
subscribers that use the simple approximations to give you pretty close
values.

Kai Keskinen
Equipment and Network Interconnect
Nortel Subsystems and Performance Networks (NSPaN)
(613)-765-3506 (ESN 395)
keskinen@nortelnetworks.com <mailto:keskinen@nortelnetworks.com>

        -----Original Message-----
        From: Moran, Brian P [SMTP:brian.p.moran@intel.com]
        Sent: Thursday, June 15, 2000 10:56 AM
        To: 'gedlund@us.ibm.com'; si-list@silab.eng.sun.com
        Subject: RE: [SI-LIST] : Upper limit of interplane
capacitance

        Does anyone out there how to reach Robert Cutler, from Malibu, CA.
He used
        to sell a PC based program that solved basic transmission line
impedance and
        coupling equations, that I found very useful in what-if analysis.
If your
        out there Robert, send me a link.

        If anyone else has a suggestion as to a simple tool I would
apprciate it.
        Not something like Ansoft. Something very basic for PCB trace
modelling and
        single conductor coupling.

        Brian P. Moran

        Intel Corporation
        Platform Design Engineering
        brian.p.moran@intel.com
        (916) 356-1912

        -----Original Message-----
        From: gedlund@us.ibm.com [mailto:gedlund@us.ibm.com]
        Sent: Thursday, June 15, 2000 7:23 AM
        To: si-list@silab.eng.sun.com
        Subject: RE: [SI-LIST] : Upper limit of interplane capacitance

        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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