[SI-LIST] Re: 8-layer PCB stackup

Kevin,
Of the two I prefer stackup B, because overlapping of two power planes is 
not good, and Stackup A does not have any power plane decoupling. However, 
unless 5V and 12V are distributed all over the board, I will try to 
combine the two on the same layer as in the following stackup.  This 
provides good power plane decoupling, and every signal layer has a Ground 
layer for return.

1 Signals
2 GND
3 Signals
4 +5V and +12V
5 GND
6 Signals
7 GND
8 Signals 


Regards, Ravinder
Server PCB Development
Hitachi Global Storage Technologies


Email: Ravinder.Ajmani@xxxxxxxx




"Kevin Khuu" <kevin98146@xxxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
06/24/2004 09:07 AM
Please respond to kevin98146

 
        To:     si-list@xxxxxxxxxxxxx
        cc: 
        From:   si-list-bounce@xxxxxxxxxxxxx
        Subject:        [SI-LIST] 8-layer PCB stackup




Which of these two PCB stackups is better?


Stackup A:

1 Signals
2 GND
3 Signals
4 +5V
5 +12V
6 Signals
7 GND
8 Signals


Stackup B:
1 Signals
2 GND
3 +5V
4 Signals
5 Signals
6 +12V
7 GND
8 Signals

Thanks,
Kevin

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