Re: [SI-LIST] : Ferrite Beads

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From: Michael Nudelman ([email protected])
Date: Thu Nov 16 2000 - 12:49:49 PST

You should keep at least one common reference signal solid; otherwise any perturbance across the Ferrite (and it will
be; that's why it is there) will be superimposed on your signals.

If you use it to reject noise from power supply and your WHOLE schematic is behind the ferrite - it is OK and even
desirable; if the ferrite is in between two parts of the sch. that are supposed to share common GND - bad idea.

Dilpreet Saini wrote:

> Hi Marc,
> Can you please comment a little bit more on Why would a ferrite in series with GND cause the ground bounce.
>
> regards,
> Dilpreet
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> Sent: Thursday, November 16, 2000 4:41 AM
> To: Dilpreet Saini; [email protected]
> Subject: RE: [SI-LIST] : Ferrite Beads
>
> >From experience, a ferrite in series with GND will cause a ground bounce on
> the board. If you're using DC coupled signals to other circuits in the
> system, these signals will see their reference point change.
>
> -Marc Godbout
>
> > -----Original Message-----
> > From: Dilpreet Saini [mailto:[email protected]]
> > Sent: Wednesday, November 15, 2000 4:45 PM
> > To: SI List (E-mail)
> > Subject: [SI-LIST] : Ferrite Beads
> >
> >
> > Hi all,
> > In the past I have used ferrite beads for transient and
> > parasitic suppression of the supply (VCC) coming into the
> > board. So far I have never used ferrite beads in series with
> > the GND trace/plane. I was wondering do any of you have any
> > experience using ferrite beads in that scenario.
> > Thanks in advance for your help.
> >
> > regards,
> > Dilpreet
>
>
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