[PCB_FORUM] Re: Planes- pos/neg- dynamic/static

Mike,

I generally use Negative dynamic planes. The down side is these planes
will only use the ant-pad or as you stated a route keep out for voids.
So if you have an area of the board that require larger clearances you
may have to either add route keep outs or use customized pad stacks with
larger anti-pads specified in that area.

 Gerry

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
gnieski_mike@xxxxxxx
Sent: Thursday, May 17, 2007 8:14 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Planes- pos/neg- dynamic/static

        Looking for opinions on this and to see how others are doing
these.

        Our CAD group has gotten into discussions as to whether or not
we should be
        doing solid power/ground planes as positives. As a long time
Allegro user I've
        been accustomed to doing solid planes as negatives and static,
though lately
        Ive been making these planes negative/dynamic to take advantage
of voiding of
        route keepouts on certain layers.

        So could I find out if anyone is going with databases that are
all positives as far
        as layers are concerned? And any comments  Pro or Con as to
using this method.


        thanks,

        Mike Gnieski
        EMC2 Corporation        
        176 South Street
        Hopkinton, MA 01748


        
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