[SI-LIST] Re: 8 Layer stack up
- From: Ravinder.Ajmani@xxxxxxxx
- To: msalami@xxxxxxxxxx
- Date: Mon, 7 Jul 2003 08:54:33 -0700
Mehrdad,
Any copper fill on Top and Bottom layer will have too little inter-plane
capacitance (due to large separation from Power/Ground planes) to be of
significance.
Regards, Ravinder
Server PCB and Flex Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxx
"Mehrdad Salami" <msalami@xxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
07/03/2003 05:39 PM
Please respond to msalami
To: "'[SI-LIST]'" <si-list@xxxxxxxxxxxxx>
cc:
From: si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 8 Layer stack up
Hi Ravinder,
Is there any reason not putting fill for the top and bottom layers. In
this example the top layer with Power and bottom layer with Ground.
Mehrdad Salami
Hardware Design Engineer
Colour Vision Systems
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ravinder.Ajmani@xxxxxxxx
Sent: Friday, July 04, 2003 1:38 AM
To: nagaraj@xxxxxxxxxxxxxxxxxxxx
Cc: [SI-LIST]
Subject: [SI-LIST] Re: 8 Layer stack up
Nagaraj,
The stackup provided in your note will provide good power plane
decoupling, but will cause wiring nightmare because of coupling between
three signal planes on each side of the Power/Ground planes. Also,
traces
on Top and Bottom layers will be too far removed from the shield planes,
resulting in excessive crosstalk and EMI. If you can have only two
Power/Ground planes then you may try the following stackup:
Top
Signal <- Fill with Ground
Power
Signal <- Fill with Ground
Signal <- Fill with Power
Ground
Signal <- Fill with Power
Bottom
The middle two signal layers should be used for routing high-speed
signals
for EMI reduction. In order to decouple the power supplies, you should
fill empty space on planes adjacent to Power and Ground planes with
Ground
and Power shapes respectively. However, make sure that it does not
impact
impedance of signals on adjacent layers. Also, avoid overlapping power
supply shapes of different voltages.
This is my $0.01.
Regards, Ravinder
Server PCB and Flex Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxx
"Nagaraj" <nagaraj@xxxxxxxxxxxxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
07/03/2003 12:19 AM
Please respond to nagaraj
To: "[SI-LIST]" <si-list@xxxxxxxxxxxxx>
cc:
Subject: [SI-LIST] 8 Layer stack up
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
The information transmitted is intended only for the person or entity to
which it is addressed and may contain confidential and/or privileged
material. Any review, retransmission, dissemination or other use of, or
taking of any action on reliance upon, this information by persons or
entities other than the intended recipient is prohibited. If you
received
this in error, please contact the sender and delete the material from
any
computer.
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
