Just remember to balance you layer stack thicknesses to prevent the board
from being warped.
- Original Message -
From: Jon Elson [EMAIL PROTECTED]
To: Protel EDA Forum [EMAIL PROTECTED]
Sent: Thursday, February 21, 2002 3:59 PM
Subject: Re: [PEDA] help with a stack ??
Robison Michael
Mike,
use this stack up
non critical
gnd
critical
-5
gnd
critical
+5 (better if this was ground)
non critical
or
gnd
critical
non critical
power
gnd
non critical
critical
gnd (if power switch critical and non critical)
two reasons why I say put the critical in the
Robison Michael R CNIN wrote:
hello,
i've got a negative (ECL) and a positive (TTL) power plane
on a board i'm doing. right now i'm figuring on a matching
ground plane for each power supply, spaced close to the
rail for switching capacitance. here's the stack i'm
thinking of:
critical
Mike, I've run into trouble by assuming the board house
would equalize dielectric thickness in the layer stack.
Some do, some don't.
I now add a fab note to equalize dielectric thickness +/- 10%
to get an approximately known dielectric thickness. Or you
can specify the prepreg thickness between
At 02:25 PM 2/21/2002 -0500, Robison Michael R CNIN wrote:
hello,
i've got a negative (ECL) and a positive (TTL) power plane
on a board i'm doing. right now i'm figuring on a matching
ground plane for each power supply, spaced close to the
rail for switching capacitance. here's the stack i'm
