Re: [SI-LIST] : Ferrite bead

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From: sweir (weirsp@a.crl.com)
Date: Fri Mar 17 2000 - 05:05:45 PST


Is your question whether to isolate or whether to isolate and bridge with a
ferrite?

If you want to use a ferrite, it needs to be appropriate to the
application. Assuming that you can adequately justify the power plane
isolation in the first place, then you need to be sure that the ferrite
both presents an adequate impedance, and is not inductive to the currents
it will see. If it is inductive, then you have a passive filter design
problem that will require adding a resistor either in parallel with the
bead, or in series with the decoupling cap to prevent peaking.

Regards,

Steve.
At 01:19 PM 3/17/00 +0500, you wrote:

>Can anybody tell me, why ferrite bead should not be used in power plane
>isolation in high speed environment and what are the options??
>
>
>
>Sunil Kumar Bahuguna
>Research Engineer
>ATM Group
>C-DOT
>Bangalore
>INDIA
>
>
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