Re: [SI-LIST] : Regarding plane splits

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From: Dennis Yarak (yarak@apple.com)
Date: Tue Jan 02 2001 - 17:26:22 PST


on 1/2/01 9:36 PM, Mike LaBonte at mlabonte@hhnetwk.com wrote:

> Dennis,
>
> Your stackups have 5 and 4 signal layers, respectively. When you say
> you are using the same Gerber files, doesn't that mean the layer routes
> are the same, with only the via padstacks changing? How is the "extra"
> signal layer used?
>
> Mike LaBonte
>
> Dennis Yarak wrote:
>>
>> I haven't been following threads recently (too busy) but I do have a mildly
>> interesting result to report in re: split planes.
>>
>> After discussions with our EMI experts we decided to do two different stack
>> ups with the same gerber files. This is a 10 layer/50 ohm board with
>> s-g-s-s-g-pslit-psplit-s-g-s, and the alternative was
>> s-g-s-psplit-g-psplit-s-g-s.

Yes sorry about the typo, that's s-g-s-psplit-g-psplit-s-s-g-s, perhaps I
should have said "take layer 4 and swap it with layer 7."

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