FreeLists / si-list / [SI-LIST] Re: 6-layer vs 7-layer PCB Stackup

["Kevin Khuu" <kevin98146@xxxxxxxxxxx>]

How about this 8-layer stackup?

1) Signals (Single Ended)
2) GND
3) Signals (Differential)
4) +5V
5) +12V
6) Signals (Single Ended)
7) GND
8) Signals (Single Ended)

Thanks.
Kevin



>From: "Moran, Brian P" <brian.p.moran@xxxxxxxxx>
>To: <kevin98146@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
>Subject: RE: [SI-LIST] 6-layer vs 7-layer PCB Stackup
>Date: Tue, 1 Jun 2004 14:07:28 -0700
>
>Kevin,
>
>Your 7 layer stackup may look symetrical but if you fill in the pre-preg
>and core designations
>it becomes clear that its not actaully symetrical. Not unless you have
>back to back pre-pregs in
>the center of the stackup.  I'm not a PCB fab guy but it doesn't look
>kosher to me. You'd be better
>off going with 6 layers, or if neccessary to a truly symetrical 8 layer.
>Money spent on backplanes
>is usually money well spent.
>
>
>Brian P. Moran
>Calistoga SIE Kit Leader
>Intel Corporation
>brian.p.moran@xxxxxxxxx
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Kevin Khuu
>Sent: Tuesday, June 01, 2004 1:42 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] 6-layer vs 7-layer PCB Stackup
>
>Hi All,
>
>I'm working on a backplane design and come up with the following 7-layer
>PCB
>stackup:
>
>1) Signal (Single Ended Signals)
>2) +5V
>3) GND
>4) Signal (Diffential Signals, high speed)
>5) GND
>6) +12V
>7) Signal (Single Ended Signals and +3.3V trace)
>
>I don't really need two GND planes, but the reason I added the second
>GND
>plane (layer 5) was because of symmetry and balancing PCB stackup.  How
>does
>this stackup compare to the 6-layer stackup (without the second GND
>layer on
>layer 5)?
>
>Your comments/ideas would be greatly appreciated.
>
>Thanks,
>Kevin
>
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