[SI-LIST] Re: Differential signals - skew - and EMC
- From: "Antonis Orphanou" <orphanou@xxxxxxxxxxxx>
- To: "Charles.Grasso@xxxxxxxxxxxx" <Charles.Grasso@xxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 1 Nov 2013 22:28:34 +0000
Hello Charles,
Ideally any skew in your differential signaling will result in a common mode
component in your system. Well hello... :)
The common mode current, given the system circumstance, is a real potent
radiator. Keep in mind that in a two wire system it takes only a 1uA of common
mode current to radiate as much as 22mA of differential mode current. Given the
situation I would design to zero skew any variables of the design that I have
control of. That should be the rule of thumb :)
Thanks
Antonis.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Grasso, Charles
Sent: Friday, November 01, 2013 12:32 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Differential signals - skew - and EMC
Hello,
In an ideal situation differential signals will have no skew through the
transmission path and (as I understand it)
the common-signal (emi) will be very low as a result. Given that EMC is very
system dependent - does any one have
a rule of thumb or anxiety(!) factor for how much is skew is tolerable before
becoming an emissions (regulatory)
Issue?
Thanks in advance.
Charles Grasso
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