[SI-LIST] Re: Differential closk wiring (with no typos :)
- From: "Greim, Michael" <mgreim@xxxxxxxxxxxx>
- To: "'f_bouchra@xxxxxxxxx'" <f_bouchra@xxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Wed, 22 Aug 2001 12:58:20 -0400
Hi Bouchra,
I wouldn't say they are wired that way for convenience.
Two benefits occur from the routing of these signals
together. The first benefit is lower emi as the emissions
from the conductors will cancel each other out. Secondly
as one is measuring the difference between the two signals,
any noise coupled on to one conductor will be invariably
be coupled on to the second thereby cancelling itself out
during the difference measurement. This is known as common
mode noise.
That being said, the circuit will still basically work whether
the signals are routed together or on completely different
layers. Lee Ritchey has an interesting paper on this very
issue.
http://www.speedingedge.com/docs/diffsig.doc
So, while the circuit will still work there are benefits that
routing the signals together will afford you.
best regards,
Michael Greim
-----Original Message-----
From: BIBICHA [mailto:f_bouchra@xxxxxxxxx]
Sent: Wednesday, August 22, 2001 10:47 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Differential closk wiring (with no typos :)
(I could not read my hand writing :)
Hi all:
I am really interested in knowing if there are rules in wiring High speed
differential clocks.
We wire them parallel about 5-10mil apart and they should have the same
length (wired in the inner layer)
I learned in one of the classes that it is wired that way for '
convenience' and it is not necessary that they are wired parallel and close
to
each other.
I have to convince other people and myself with that and I need more data.
Thanks for your help
Bouchra
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
