[SI-LIST] Re: Splitting this power plane - And GND planes count
- From: steve weir <weirsi@xxxxxxxxxx>
- To: ivor@xxxxxxxxxxx, alan@xxxxxxxxxxxxxxxxx
- Date: Mon, 14 Mar 2005 10:46:34 -0800
Ivor, that stack-up is looking a lot better. You still have quite a bit of
work to do, but this one could fly.
Steve.
At 10:40 AM 3/14/2005 -0800, Ivor Bowden wrote:
>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
> >
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