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

["Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>]

Personally I would leave the second ground in there
if high speed is truly high speed. Broadband coupled
stripline diff pairs are very well behaved.

Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel:  303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx;  
Email Alternate: chasgrasso@xxxxxxxx
 


-----Original Message-----
From: Kevin Khuu [mailto:kevin98146@xxxxxxxxxxx] 
Sent: Tuesday, June 01, 2004 2:42 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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