RE: [SI-LIST] : Ferrite Beads

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From: Dilpreet Saini (DSAINI@altera.com)
Date: Thu Nov 16 2000 - 15:23:11 PST


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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