|
[si-list]
||
[Date Prev]
[07-2001 Date Index]
[Date Next]
||
[Thread Prev]
[07-2001 Thread Index]
[Thread Next]
[SI-LIST] Re: power plane spacing
- From: Ritchey Lee <leeritchey@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 11 Jul 2001 14:50:18 -0700
The small spacing has nothing to do with EMI. It has to do with creating a
large value, high performance capacitor to supply switching currents.
Lee
DORIN OPREA wrote:
> Hi everyone,
>
> In high speed design we often use the split planes on a power layer. The
> spacing between the digital planes is correlated with the distance
> between the power layer to the ground layer. In general we have 50 mil
> spacing. It just happen to run into a different opinion which recommends
> a very small spacing due to the slot antenna effect (the gap between the
> planes) that allows the eddy currents to radiate. A small spacing may
> couple noise into the low power supply (1.5V or 1.8V).
> How critical is this radiation effect versus noise coupling between the
> two power distribution systems ?
> What is the practice out there ?
>
> Thanks very much for you guys always being there,
> Dorin
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
> http://www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
http://www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
|
|
