RE: [SI-LIST] : ferrite bead

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From: Mark Gill (gillmf@nortelnetworks.com)
Date: Wed Jun 14 2000 - 06:52:16 PDT


Weber - Could you be a bit more specific about your design? Thanks.

Regards,

Mark Gill, P.E.
EMC/Safety/NEBS Design
Nortel Networks - RTP, NC, USA

> -----Original Message-----
> From: Weber Chuang [SMTP:WeberChuang@via.com.tw]
> Sent: Tuesday, June 13, 2000 11:47 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : ferrite bead
>
> Dear SI-gurus,
>
> I have a question about the ferrite bead we usually implement on the
> power
> of clock generator, what is the real purpose that we put a ferrite when
> connecting Vdd to clock generator, is it for blocking the noise from clock
> generator that might go back into the power source and then into other
> devices that share that same power, or it is for blocking the noise from
> other device into clock generator? Or both ? And we found that on field
> measurement this ferrite bead seems to radiate a lot. Is it a natural
> consequence or we implement it the wrong way? Thanks in advance for any
> input.
>
> Best Regards
> Weber Chuang
> Signal & Timing Integrity Engineer,
> VIA Technologies, Inc. Taipei, Taiwan, ROC
> TEL : 886-2-22185452 ext : 6522
> mailto:weber@via.com.tw
> http://www.via.com.tw
> Very Innovative Architecture
>
>
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