[SI-LIST] Re: Routing Parallel vs. Paralell
- From: "Ken Cantrell" <Ken.Cantrell@xxxxxxxxxxxxxxxx>
- To: <pcbjack@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 14 Sep 2006 08:59:37 -0600
Jack,
As Steve pointed out a field solver is required for that type of analysis.
From a MATH viewpoint, coupled line theory is not simple, and the equations
are relatively inaccurate at today's geometries. Two texts that explain the
math are
Analysis of Multiconductor Transmision Lines, Clayton Paul
Networks and Devices Using Planar Transmissions Lines, Franco Di Paola
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Jack Olson
Sent: Thursday, September 14, 2006 8:30 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Routing Parallel vs. Paralell
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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