[SI-LIST] Re: Routing Parallel vs. Paralell
- From: "Jack Olson" <pcbjack@xxxxxxxxx>
- To: "Ken Cantrell" <Ken.Cantrell@xxxxxxxxxxxxxxxx>
- Date: Sat, 16 Sep 2006 11:57:14 -0500
Okay, I have used up more than my fair share of "the resources" here,
(so I will go back to "lurker mode" for awhile) but I just wanted to thank
everyone for all the help.
With the gentle guidance of a few kind souls I realize that I was having
a total bonehead brain freeze yesterday, but I just couldn't grasp it.
It all started when I had an engineer obsessing over a few short layer-
to-layer overlaps, and then I started teasing him about being more
concerned with the little overlaps and totally ignoring long parallel runs.
THEN I started wondering if I was missing something, so I came here.
Thanks you all for responding, I really appreciate it.
Jack (aka "the not-so-new guy who still regularly feels like the new guy")
-=-=-=-
On 9/14/06, Ken Cantrell <Ken.Cantrell@xxxxxxxxxxxxxxxx> wrote:
>
> 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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