Re: [SI-LIST] : Ferrite Beads

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From: Michael Nudelman ([email protected])
Date: Thu Nov 16 2000 - 17:44:45 PST


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:[email protected] <mailto:[email protected]> ]
> Sent: Thursday, November 16, 2000 2:35 PM
> To: Dilpreet Saini; [email protected]
> Cc: [email protected]
> 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: [email protected]
> [ mailto:[email protected] <mailto:[email protected]> ]On Behalf Of Dilpreet Saini
> Sent: Thursday, November 16, 2000 10:26 AM
> To: '[email protected]'
> Cc: [email protected]
> 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: [email protected] [ mailto:[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] <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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