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

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From: Dave Hoover (dave_hoover@yahoo.com)
Date: Mon Apr 17 2000 - 13:33:27 PDT


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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