[SI-LIST] Re: Students - matching 1 mil IEEE1394/ethernet guidelines and DM to CM conversion
- From: "Leonard Dieguez" <ldieguez@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 1 Jun 2007 15:40:14 -0700
I'm not sure why we are worried about 1 mil difference. If you are at a
speed (bitrate) where you are worried about P-N differential skew of 1
mil then you have much bigger problems. First, you can have the P-N
traces exactly the same from end to end including packages and die and
you can still have the problem of the board material introducing the
skew. This is esp true for materials like FR4. .oO( I think that I have
seen this somewhere before(...teraspeed))where the glass weave will
introduce the skew. This is where single ended transmission lines can
shine, no skew is developed on a single ended transmission line (think
balum).
Leoanrd Dieguez
aka: "Cat Herder"
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Chris Cheng
Sent: Friday, June 01, 2007 2:36 PM
To: wdowsley@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Students - matching 1 mil IEEE1394/ethernet
guidelines and DM to CM conversion
Show me a case where 1 mil difference will break SI.
Then.
Show me a case where 1 mil difference will break EMI but not SI.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Bill Owsley
Sent: Friday, June 01, 2007 2:29 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Students - matching 1 mil IEEE1394/ethernet
guidelines and DM to CM conversion
If any students are still with us, the ongoing interchange might =3D
indicate that these subjects are indeed interesting and can be somewhat
=3D
complex in that there are a number of variable to keep in mind - all at
=3D
once. =3D20
And maybe enough information to get your project done well.
You're welcome... < > really stupid grin within the brackets
=3D20
And this all started with a simple help me with my project question.
=3D20
Since this is an SI list, the EMC aspects seem a little less =3D
important. I'm reminded of a class on how to use one of those CAD tools
=3D
for schematic capture, layout, SI, EMC. The SI guys got to go home a =
=3D
day early since their concern in class was millivolts. The EMC guys had
=3D
to stay over a day to work on the microvolts part.
=3D20
And there is at least one layout group that has for me, a short rope =
=3D
and tall tree. But I love them anyway.
=3D20
---------------------------------
Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user =
=3D
panel and lay it on us.
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