[SI-LIST] Re: Power plane coupling

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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