[SI-LIST] Re: Why remove the power/gnd plane area between the I/O connector and transformer/filter?
- From: Trina Shih <trina.shih@xxxxxxxxx>
- To: "Shao, Peng" <Peng_Shao@xxxxxxxxxx>
- Date: Tue, 31 Jan 2012 08:18:29 -0800
Hi
Containment and ease
Trimming is only a choice and not a necessary process case by case.
In order to void the different ground/power noise influence.
Intuitively, trimming is a method.
For the stack up with multi power ground layers, keep them complete
can also pass EMC and ESD.
Regards
Trina
Sent from my iPhone
On Jan 31, 2012, at 1:37 AM, "Shao, Peng" <Peng_Shao@xxxxxxxxxx> wrote:
> Experts,
> You may know that there is a traditional layout rule for out-board I/O
> signals. The power/gnd plane area between I/O transformer/filter and
> connector should be removed for EMI/ESD consideration.
> I cannot understand why we need to do that or the function to improve
> EMI/ESD. Could you please give out your opinion? Thanks.
> ( To get high impedance trace? )
>
> Peng, Shao SI Engineer
>
>
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