[SI-LIST] Re: U and E
- From: "Greim, Michael" <mgreim@xxxxxxxxxxxx>
- To: "'shabbir@xxxxxxxxxxxxxxxx'" <shabbir@xxxxxxxxxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Wed, 8 Aug 2001 17:17:02 -0400
Hi Shabbir
A high frequency signal is a signal that has
a high frequency content. This will be driven
by the rise time of the signal. A high speed
signal I would define as a fast toggle rate.
As we know from our si list and books rise time
is what effects your signal integrity. As new
technology with faster edge rates replace older
slower technology due to end of lifing, etc,it
is not uncommon to have SI issues surface because
you have a low speed signal with a high frequency
content.
I hope that this helps.
Just my 0.02
MG
-----Original Message-----
From: Shabbir [mailto:shabbir@xxxxxxxxxxxxxxxx]
Sent: Tuesday, May 09, 2000 5:14 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: U and E
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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