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

  • From: Rick Collins <gnuarm.2007@xxxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 12 Sep 2014 14:51:17 -0400

At 11:47 AM 9/12/2014, you wrote:
>All generalizations are false.

Including this one.  :)

Rick



>-----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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