[SI-LIST] Re: Layer Stackup
- From: Michael Khusid <mkhusid@xxxxxxxxxx>
- To: "'david.kaushansky@xxxxxxxxxxxx '" <david.kaushansky@xxxxxxxxxxxx>,"'si-list@xxxxxxxxxxxxx '" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 7 Jan 2004 09:56:13 -0500
David,
As long as you route orthogonally on adjacent signal layers, you should not
have a crosstalk problem at 100MHz. Also, make sure you decouple the power
and ground planes well so return currents can move from one plane layer to
another without major discontinuities.
Michael
-----Original Message-----
From: david.kaushansky@xxxxxxxxxxxx
To: si-list@xxxxxxxxxxxxx
Sent: 1/7/04 9:40 AM
Subject: [SI-LIST] Layer Stackup
The design I am working has a fairly dense placement. To try minimize my
time in artwork, I would like to add as many routing layers as possible
to
my layer stackup. I was thinking of using an 18 layer board of Nelco
4000-13, with the following stackup:
Signal1
GND
Signal2
Signal3
PWR
Signal4
Signal5
GND
Signal6
Signal7
GND
Signal8
Signal9
PWR
Signal10
Signal11
GND
Signal12
The skinniest dielectric thickness is 4 mils, all signal layers are 0.5
Oz
copper and plane layers are 1 Oz copper. The fastest signals are 100MHz,
with rise times in 500ps range.
My primary concern is the ratio of 6:12 of plane layers to signal
layers.
I usually try to design for a ratio of about 8:10 or 9:9. I know I will
have to be very careful about crosstalk on adjacent layers, but other
than
that, what else should I be concerned about?
Thanks
Dave
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