[SI-LIST] Re: Cross-hatched reference planes
- From: "MW-hot-ip" <mark.woods@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 3 Apr 2007 17:01:57 -0800
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----- Original Message -----
From: "Jeff Seeger" <jseeger@xxxxxxxxxxxxxx>
To: <leeritchey@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, April 03, 2007 12:48 PM
Subject: [SI-LIST] Re: Cross-hatched reference planes
Lee Ritchey wrote:
>Jeff,
>
> What are the situations where these items apply? We'd like to know as we
>hear such statements often without any accompanying explanations.
>
>
> snip <
>>
>>Lee Ritchey wrote:
>> >
>> > Unless this is a flex circuit, why would you cross hatch a plane?
>>
>> Copper balance, venting, and laminate/laminate bonding
>> can be issues in certain situations.
>>
While I'll confess I'm pressed for time here's a 20 sec follow up;
the second two are admittedly very narrow needs:
- crosshatch may be helpful to balance copper usage in a stackup to
minimize propensity for warpage, or on the 'outer layers" of a sub-
assembly in a sequential lamination construction
- venting these days is primarily of concern in device substrate
ie build-up multilayer
- laminate to laminate bonding can be an issue in some high stress
or multi-material situations
Hope that helps,
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
jseeger "at" appliedcad "dot" com 978 649 9800
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