[SI-LIST] Re: Ferrite Beads on Differential Signal Lines?

  • From: "Orin Laney" <olaney@xxxxxxxxx>
  • To: <leeritchey@xxxxxxxxxxxxx>, <clfranci@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 12 Sep 2014 08:47:43 -0700

All generalizations are false.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Lee 
Sent: Friday, September 12, 2014 8:15 AM
To: clfranci@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ferrite Beads on Differential Signal Lines?

It makes no sense to put ferrite beads in any signal line.  How did this get
started?

-----Original Message-----
From: Craig Francis
Sent: Thursday, September 11, 2014 4:11 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ferrite Beads on Differential Signal Lines?

SI-List,
I haven't seen any literature concerning using ferrite beads on each signal
line of a differential pair.
Usually only a common-mode choke is used to reduce common-mode EMI.

Can ferrite beads be used on a differential pair to increase the the rise
time of the signal and reduce unnecessary high-frequency content that may
radiate?

The two ferrite beads would be sized to allow the bandwidth necessary for
the differential signal's highest data rate.


Thanks,
Craig Francis


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