[SI-LIST] Re: Power plane coupling
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: ludovic.levieil@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 24 Oct 2005 09:27:36 +0800
Dear Ludovic
I have made a similar PCB of your stackup. The noise coupling between VCC1 and
VCC2 is serious. I suggest that the seperation between VCC1 and VCC2 to be
large.
Best Regards
Zhangkun
2005.10.24
----- Original Message -----
From: "Ludovic Levieil" <ludovic.levieil@xxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Thursday, October 20, 2005 4:12 PM
Subject: [SI-LIST] Power plane coupling
> Hello All,
> In my current board design I have the following stack up:
>
> .......
> ---------------- GND (solid plane)
> ------ ----- --- VCC1 (splitted plane)
> --- ----- ------ VCC2 (splitted plane)
> ---------------- GND (solid plane)
> .......
>
> 4 mils separate GND and VCC planes
> 5 mils separate VCC1 and VCC2 planes
>
> Both VCC planes are splitted in different power domains and I am wondering
> :
> - if having two coupled VCC planes is good/acceptable when
> thinking about noise ??
> - if there is a problem in having one power domain on on plane
> overlapping at least two power domains on the other plane ??
>
> Thanks
>
> Ludovic Levieil
>
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