[SI-LIST] Re: Routing Parallel vs. Paralell
- From: steve weir <weirsi@xxxxxxxxxx>
- To: pcbjack@xxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Thu, 14 Sep 2006 07:34:38 -0700
Jack that is what we have field solvers for. You used to be able to
rent time on Polar 8000 for about $20/hr. Otherwise find someone
with Polar or Ansoft and run the model.
Steve.
At 07:29 AM 9/14/2006, Jack Olson wrote:
>I got a MATH question I don't know how to solve...
>I want to know the difference between running traces
>parallel on the same layer (side by side) compared
>to running them on different layers right on top of
>each other (broadside).
>
>I know won't be a simple answer,
>so I will provide a simple example:
>
>Say I am using 6mil traces with 6mil clearances on
>layers that are 6mil apart using half ounce copper
>(which is nearly .6mils) and both layers are internal.
>
>What distance can I route side by side and get the
>same coupling as if I had routed them broadside?
>
>So I want a simple thing to remember that says
>something like, "traces routed 1 inch in parallel will
>couple the same amount as traces routed .2 inches
>broadside (layer to layer)
>
>Does anyone know how to make my rule-of-thumb?
>and if I change to 1oz copper, will the rule double?
>
>onward thru the fog,
>Jack
>
>
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