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

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Fri, 12 Sep 2014 14:04:25 -0700

Some generalizations are more general than others.

Steve
On 9/12/2014 8:47 AM, Orin Laney wrote:
> 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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