Re: [SI-LIST] : anybody fielding newbie questions??

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From: cadpro2k@dacafe.com
Date: Mon Apr 17 2000 - 14:45:25 PDT


Hi Mike,

What I might suggest is to couple your +5V plane next to the GND plane,
and replace the layer2 +5V with another GND plane to give you the
balanced 10 layers. I'd suggest the coupling of the +5V/GND to help
filter any excess noise levels, much more than you'll have from your
+15V plane. Your +15V plane should be able to stand by itself.

Good luck.

Mitch

---------Included Message----------
> Date: Mon, 17 Apr 2000 13:33:27 -0700 (PDT)
> From: "Dave Hoover" <dave_hoover@yahoo.com>
> Reply-To: <si-list@silab.eng.sun.com>
> To: <si-list@silab.eng.sun.com>
> Subject: Re: [SI-LIST] : anybody fielding newbie questions??
>
> I have one first....please add a redundant grnd plane
> in the center to make 10 layers. This will keep the
> PCB balanced from the center out which will decrease
> the possibility of warpage. (Also, the fabricator
> would build it as a 10 layer anyways but would just
> etch all the copper off one side of something. So if
> you'd be charged for it anyways....why not add the
> extra plane.)
>
> Dave
> --- Robison Michael R CNIN <Robison_M@crane.navy.mil>
> wrote:
> > hello,
> >
> > i hope that i'm posting correctly here. i'm laying
> > out a board and
> > thinking i'll have 9 layers:
> >
> > sig
> > +5V
> > sig
> > sig
> > gnd
> > sig
> > sig
> > -15V
> > sig
> >
> > this means my power and ground planes aren't
> > adjacent, but at
> > least each signal is positioned next to a power/gnd
> > plane. the
> > board is 11" by 11" and running ALS for some
> > lowspeed memory
> > loading and memory access, and then a few F series
> > chips to
> > run at 25MHz, with some of the fast stuff as board
> > I/O.
> >
> > any comments would be appreciated.
> >
> > thank you, miker
> >
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