[SI-LIST] Re: Split planes
- From: "Ron Mancuso" <ron.mancuso@xxxxxxxxxxx>
- To: <rcarrett@xxxxxxxxxxxxx>
- Date: Mon, 4 Mar 2002 10:29:29 -0700
The advantage to stackup 1 is its ability to better couple the power
supplies to ground. If your frequencies of interest are >200 MHz, the
most effective form of noise decoupling of the power distribution system
will be through close power-ground pairs. If you choose this, limit
uber-critical signals to layers 11 (#1 choice) and 13 (#2 choice) which
both have the advantage of closer ground. This may have the
disadvantage of 'leaky' EMI from layer 13.
The advantage to stackup 2 is its ability to better couple the signal
layers to ground. Your critical signals can be routed on both 9 and 11
making the layer 13 your third choice.
Someone may better explain the EM effects of splitting the power supply
plane and its relation to ground. The only advice I can recommend is to
not route signals over the power plane splits and watch 'edge-coupling'
between power supplies (the distance from plane edge to plane edge.
Thank you,
Ron Mancuso
-----Original Message-----
From: Roberto Carretta [mailto:rcarrett@xxxxxxxxxxxxx]
Sent: Monday, March 04, 2002 8:44 AM
To: Si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Split planes
Hi all,
I'm investigating two different stackup configuration for a 14 layer
board:
Stackup 1 (last 8 layers):
Layer 8 - GND
L9 - Power (split plane)
L10 - signal
L11 - signal
L12 - GND
L13 - signal
L14 - signal (BOTTOM)
Stackup 2
Layer 8 - GND
L9 - signal
L10 - Power (split plane)
L11 - signal
L12 - GND
L13 - signal
L14 - signal (BOTTOM)
I can't move GND layer 8, the only variable is the position of the
splitted power plane.
Which is the best solution?
Routing critical nets on layers 9 and 11 of stackup 2, is splitted power
plane a big problem or the ground planes 8 and 12
minimize split plane influence? Or is preferable stackup 1, with ground
plane adjacent to the splits?
Thanks in advance.
Roberto Carretta.
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