[SI-LIST] : Split ground planes

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From: Shahar Eytan (shahar@mellanox.co.il)
Date: Thu Jan 25 2001 - 04:56:36 PST


> Hi,
>
> In a recent application I had looked into I've seen the following power
> scheme:
> Vdd (referenced to GND) is filtered by a PI filter (Capacitor - Ferrite -
> capacitor) to receive Vdd`.
> Vdd' is referenced to GND`, GND` is connected to GND through a Ferrite
> (same one as in the PI filter).
>
> The following scheme describes the above:
>
> Vdd Vdd`
> I I
> I--------Ferrite---------------------------------I
> I I
> Cap(33u) Cap(33u)
> I I
> I I
> ---------GND-----------------Ferrite-------GND`
>
> What puzzles me is the Ferrite is the Ferrite between the grounds. What is
> the explanation for this type of scheme? Anyone can point me to
> references for such schemes?
>
> Thanks,
>
> Shahar Eytan
> Mellanox Technologies Ltd.
> <mailto:shahar@mellanox.co.il>
> Tel: 972-4-9593244 ext 264
> Fax: 972-4-9593245
>

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