RE: [SI-LIST] : Ferrite Beads

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From: Dilpreet Saini (DSAINI@altera.com)
Date: Thu Nov 16 2000 - 10:33:04 PST


Thanks Allen. I have a fairly good idea about ground bounce. What I was not sure about was "why having a ferrite in series with GND would cause ground bounce"

regards,
Dilpreet

-----Original Message-----
From: Allen Fernandez [mailto:Allen_Fernandez@Jabil.com]
Sent: Thursday, November 16, 2000 10:28 AM
To: Dilpreet Saini; 'marcgodbout@auranetinc.com'
Cc: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : Ferrite Beads

Dilpreet,

Doug Brooks has some excellent articles about ground bounce in his
"Brookspeak Articles". Goto :

http://www.ultracad.com/articles.htm

and look for "Ground Bounce, Parts 1 and 2".

Also, if you have "High-Speed Digital Design : A Handbook of Black Magic",
by Dr.Johnson and Dr.Graham, there's an excellent explanation of ground
bounce starting on page 67 (section 2.4.1.1).

--Allen

-----Original Message-----
From: Dilpreet Saini [mailto:DSAINI@altera.com]
Sent: Thursday, November 16, 2000 12:26 PM
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]
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]
> 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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