[SI-LIST] Re: FB for SPI bus
- From: Tayyab Rahimkhan Pathan <Tayyab_Pathan@xxxxxxxxxxx>
- To: "weirsi@xxxxxxxxxx" <weirsi@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 31 Aug 2012 05:14:30 +0000
Actually we are working for a customer who after reviewing the schematics of a
RF card want us to put FB on all signal lines going to this card from main
board to ensure system EMC.
In general, when to use high impedance beads and when low impedance? Is there
any thumb rule for selecting FB (impedance value)?
Regards,
Tayyab
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Thursday, August 30, 2012 8:17 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: FB for SPI bus
Who is dictating the bead? Where do they want you to put it, and what is their
justification? If they aren't just hoping that these are magic beads, they
will have purpose and parameters.
Steve.
On 8/30/2012 3:51 AM, Tayyab Rahimkhan Pathan wrote:
> Hi,
> I have to use a Ferrite Bead (FB) for SPI bus interface signal line
> protection. Which will be preferred impedance 33E @ 100MHz or 120E @ 100MHz.
> I think 33E @ 100MHz specs FB will be good for SPI bus or will it be
> dependent on driver and trace impedance?
> Pls help.
>
> Regards,
> Tayyab
>
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