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Date: Mon, 7 Nov 2011 14:04:43 -0700
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Subject: Re: [geda-user] PCIe card?
From: Russell Dill <Russ DOT Dill AT asu DOT edu>
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> One idea I had for a quick start was to lay out and edit a PCB with
> the differential pairs replaced by fat single traces of thickness (2 *
> differential trace copper thickness + differential trace internal
> spacing).  A fairly simple bit of code could later convert these from
> fat single traces to differential pairs.

BTW, it isn't really necessary to route differential traces this way.
Rather than route them with a very tightly regulated spacing, you can
route them instead with a minimum spacing as single ended traces,
which is much easier. Just be sure they have equal lengths impedances.