[SI-LIST] Re: 8 Layer stack up
- From: "Youssef Khalife" <youssefk@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>,"Best, Frederick K" <frederick.k.best@xxxxxxxx>
- Date: Thu, 10 Jul 2003 10:26:38 -0700
Fred
Your stack up does not have good plane capacitance for EMI and noise =
margin and also the top and bottom signal layers do not have a close =
reference plane to reduce the cross talk. You may need to simulate your =
stack up using hyperlynx or other tools to determine the trace seperation =
between two signal traces on each signal layer.=20
Youssef K
>>> "Best, Frederick K" <frederick.k.best@xxxxxxxx> 07/09/03 12:24PM >>>
Nagaraj,
I am not a Guru, but I have a list of stack-ups that have=20
collected from published experts and have used them over=20
the years.
Is there a reason why your Top and Bottom layers can
not also be GND planes?
I would not use the stack-up that you show. You should have all
signal layers adjacent and tightly coupled to a plane. The
listed second and ninth signal layers violate that.
I recommend the following with your 2 plane and 4 signal
layers constraint.
Top =20
Signal (H1)=20
GND
Signal (V1)
Signal (H2)=20
Power
Signal (V2)=20
Bottom=20
If possible make the top and bottom layers into GND layers.
Fred Best
Staff Engineer
Lockheed Martin
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
Hi Gurus,
What will be the Best Layer Stack up for 8 Layer Board,
Constraint is we can have only 2 Planes,
Top
Signal
Signal
Power
GND
Signal
Signal
Bottom
Board Construction with Through Hole Vias
Please Comment on this.
Nagaraj
Research Engineer
nagaraj@xxxxxxxxxxxxxxxxxxxx=20
Embedded Wireless Labs Sdn Bhd
www.embeddedwireless.com=20
=20
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