[SI-LIST] Re: Cross-hatched reference planes
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Jeff Seeger" <jseeger@xxxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 3 Apr 2007 14:09:46 -0700
All of those reasons, except the flex circuit one, went by the wayside many
years ago. Wonder why they still linger around the industry like old socks!
Lee Ritchey
> [Original Message]
> From: Jeff Seeger <jseeger@xxxxxxxxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 4/3/2007 1:48:55 PM
> Subject: Re: [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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