FreeLists / si-list / [SI-LIST] Re: 8 Layer stack up

["Best, Frederick K" <frederick.k.best@xxxxxxxx>]

Nagaraj,

I am not a Guru, but I have a list of stack-ups that have 
collected from published experts and have used them over 
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  
  Signal (H1) 
  GND
  Signal (V1)
  Signal (H2) 
  Power
  Signal (V2) 
  Bottom 

If possible make the top and bottom layers into GND layers.

Fred Best
Staff Engineer
Lockheed Martin

=======================================================
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

Embedded Wireless Labs Sdn Bhd
www.embeddedwireless.com
 
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