FreeLists / si-list / [SI-LIST] Re: U and E

[Shabbir <shabbir@xxxxxxxxxxxxxxxx>]

Hi All,
Could somebdoy pls explain elaborately the difference between a high
frequency signal and a high speed signal? What are the related issues with
them from Signal Integrity point of view that we must take into
consideration in the prelayout stage???

Shabbir Butt

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Mellberg Hans
Sent: Wednesday, August 08, 2001 1:57 PM
To: p2rich@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: U and E



Er or Relative permitivity is a multiplier for the
absolute permitivity of 8.85 * 10-12 F / M. Er is also
known as the relative dielectric constant of the
material in question. In basic equations, the absolute
value is already absorbed into a constant of the
equation and one only needs to insert the relative
permitivity value. For example, go to UMR's website
(http://www.emclab.umr.edu/pcbtlc/index.html) and
there you will see that you only need to insert the
relative value and not the complete EoXEr value.

The same goes for the relative permeability constant.

I hope this answers your question.

Hans
--- Rich Peyton <p2rich@xxxxxxxxxxxxx> wrote:
>
> Hi All,
>
> In Equations for permattivity (Eo) and permeability
> (uo) I always get the
> two confused!  There's also Er and Ur in these
> equations which I input
> dielectric constant?  Any SI Gurus have some good
> input on the two?
>
>
>   Constants:
> Permattivity ( eo ) = 8.85 * 10-12 F / M
> Permeability ( uo ) = 1.26 * 10-6 H / M
>
> Thanks,
> Rich
>
>
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