[SI-LIST] Re: Splitting this power plane - And GND planes count
- From: Ivor Bowden <ivor@xxxxxxxxxxx>
- To: alan@xxxxxxxxxxxxxxxxx
- Date: Mon, 14 Mar 2005 10:40:03 -0800
I appreciate the comments! We do have various constraints to work with
of course, but recognize the original stackup could be improved.
Currently I are looking at:
1) component / signal
2) split power plane
3) signal
4) ground plane
5) signal
6) signal
7) ground plane
8) signal
9) split power plane
10) component / signal
This way signals are either asymmetrical stripline, or stripline (albeit
depending on split plane bypassing) or microstrip (also depending on
split plane bypassing). Unused areas of the signal layers will be copper
flooded with ground, except the asymmetrical stripline.
I know that is not optimal either, of course, but I have time and budget
constraints and the product needs to be built..
Ivor
on 3/11/2005 8:09 PM Alan Hilton-Nickel wrote:
>steve weir wrote:
>
>>1) Why three big power planes if they do not form cavities with logic
>>ground? If this is a DC problem then apply a DC solution.
>>
>And from the DC perspective, if 3 planes are needed on the supply side
>to provide sufficient current, then three ground planes would also be
>needed to complete the circuit.
>
>Nasty stackup indeed.
>
>Ivor, you need two more layers. May I suggest (depending on your signals
>of course):
>
>1. Component/signal
>2. Ground
>3. Power
>4. Signal
>5. Signal
>6. Power
>7. Ground
>8. Signal
>9. Signal
>10. Power
>11. Ground
>12. Component/Signal
>
>Alan
>
>------------------------------------------------------------------
>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 FAQ wiki page is located at:
> http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
> http://www.si-list.org
>
>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 FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
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:
