[SI-LIST] Re: Effect of Split Planes on Single Stripline Signals
- From: Istvan Novak <istvan.novak@xxxxxxx>
- To: Walter <waltinaustin@xxxxxxxxx>
- Date: Sat, 12 Jun 2010 11:36:53 -0400
Walter,
There are a few more details to take into consideration:
- what is the stackup beyond the split plane? If you have a solid
ground plane close behind the split plane, it helps. On the other hand,
if you have further (possibly split) power planes beyond the split-plane
layer, it will make things worse. You will find graphs illustrating the
former in Jason's paper referenced below.
- what do you carry on the (split) planes? Though this is not
specifically a split-plane problem, even when we offset the stripline
away from a plane layer, we need to consider the magnitude of noise
expected on the plane. If supply rails related to your signaling, it is
safer as opposed to say a high-voltage (12V or 48V) input rail. In the
offset stripline stack a noisy 12V plane should be much further away
from the trace layer
Regards,
Istvan Novak
Oracle-America
jason.miller@xxxxxxxxxx wrote:
> You may find this paper helpful:
>
> http://www.electrical-integrity.com/Paper_download_files/DC09_10-WA3--Jason_Miller.pdf
>
>
> Jason Miller
>
> On Jun 9, 2010, at 5:00 PM, Walter <waltinaustin@xxxxxxxxx> wrote:
>
>
>> I have an application were I am contemplating routing signals across
>> splits in a plane. Everyone know that this is a big no no for high
>> speed signals. But in this case, it's a asymmetric single stripline.
>> The traces are 12 mils from a split plane and 3mils from a solid
>> plane. Can I expect a measurable effect on my DDR3 1600 signals? I
>> would like to simulate this with a 3d solver but I don't have access
>> to one.
>>
>> Regards,
>> Walter Haskell
>> Polycom. Inc.
>>
>>
>>
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