RE: [SI-LIST] : Ferrite Beads

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From: Mendelsohn, Joseph P (Joseph) (jmendelsohn@lucent.com)
Date: Fri Nov 17 2000 - 06:30:00 PST


Dilpreet,
        I agree with Mike as long as you have no cables connected to the
analog side of the board. If so, you may require a common mode choke
configuration instead of the simple ferrite beads.

-----Original Message-----
From: Michael Nudelman [mailto:mnudelman@tellium.com]
Sent: Thursday, November 16, 2000 8:45 PM
To: Dilpreet Saini
Cc: 'Ken Cantrell'; marcgodbout@auranetinc.com;
si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : Ferrite Beads

So, ypu are using ferrites to clean the power supply and not between two
parts of the sch. That is what you should've said in the beginning.

This is all right.

Mike.

Dilpreet Saini wrote:

> Hi Ken,
> Here are the questions that I have in mind:
>
> * Is "Bridging" or "Stitching" an Analog and Digital ground plane
with a ferrite bead a recommended technique?
> * Is there any significance of using a ferrite bead in series with
the GND connection (in addition to that of the VCC) as shown below:
>
> ferrite
> Supply/Regulator VCC--------------^^^^^-----------VCC connected to the
Components on the board
>
> ferrite
> Supply/Regulator GND-----------^^^^-----------GND connected to the
Components on the board.
>
>
> regards,
> Dilpreet
>
>
> -----Original Message-----
> From: Ken Cantrell [ mailto:Ken.Cantrell@srccomp.com
<mailto:Ken.Cantrell@srccomp.com> ]
> Sent: Thursday, November 16, 2000 2:35 PM
> To: Dilpreet Saini; marcgodbout@auranetinc.com
> Cc: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : Ferrite Beads
>
> Dipreet,
> Are you describing a situation where you are "bridging" two grounds, like
> digital and analog, or a split plane, and if/why that would cause ground
> bounce?
> Ken
>
> -----Original Message-----
> From: owner-si-list@silab.eng.sun.com
> [ mailto:owner-si-list@silab.eng.sun.com
<mailto:owner-si-list@silab.eng.sun.com> ]On Behalf Of Dilpreet Saini
> Sent: Thursday, November 16, 2000 10:26 AM
> To: 'marcgodbout@auranetinc.com'
> Cc: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : Ferrite Beads
>
> 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: marcgodbout@auranetinc.com [ mailto:marcgodbout@auranetinc.com
<mailto:marcgodbout@auranetinc.com> ]
> Sent: Thursday, November 16, 2000 4:41 AM
> To: Dilpreet Saini; si-list@silab.eng.sun.com
> 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:DSAINI@altera.com
<mailto:DSAINI@altera.com> ]
> > 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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