[SI-LIST] Re: power planes on adjacentlayers crossing each other
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 10 Jul 2014 13:56:27 -0700
Orin, I would be careful about qualifying that blanket statement. There
are well documented case histories where that assumption was applied in
somewhat ridiculous ways with the predictably disastrous results.
Best Regards,
Steve
On 7/10/2014 12:37 PM, Orin Laney wrote:
> No, not a concern. This forum chats a lot about high speed signals crossing
> plane splits, but the various power supplies are not high speed signals.
> High Sometimes people worry about noise coupling through the small common
> capacitance, but unless your needs are truly unusual, such coupling is so
> small compared to the bypass capacitances that it is of no consequence.
>
> Note that high speed signals outside of this portion of the stack up will
> see only your ground planes and not be affected by the split power planes or
> their overlapping portions.
>
> Orin
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Ashok Srinivas
> Sent: Thursday, July 10, 2014 12:13 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] power planes on adjacentlayers crossing each other
>
> Hi SI-LIST,
> We are using a 12 layer PCB stack up and have power planes on layer 6 and
> layer 7 (just to clarify layers 6 and 7 are not power planes completely but
> its more like a power plane island). These power planes on layers 6 and 7
> cross each other.
>
> I will use layer 5 to ground the layer 6 power plane and similarly use layer
> 8 to ground the layer 7 power plane.
>
> Is this crossing a concern ?if yes why?
>
> Thanks!
> --
> Ashok
>
>
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