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	Fri, 13 May 2016 00:23:02 -0700 (PDT)
Date:	Fri, 13 May 2016 09:22:57 +0200
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Differential pair support
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It's not that hard, perfect!

Then eventually I get enough time to work on different clearances for different nets internet is full of differential line impedance calculators and this could be added to.

I guess more than two might be useful then drawing buses but it is more important to get into use.


Regards Nicklas Karlsson



On Fri, 13 May 2016 14:58:08 +1000
"Stephen Ecob (stephen DOT ecob AT sioi DOT com DOT au) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:

> Here's a basic implementation of differential pair support.
> 
> The code in "differential.c" needs to be placed inside action.c
> 
> The code is run by typing
> 
> :MakeDifferential(TargetWidth,gap)
> 
> where TargetWidth is the width of lines to transform and gap is the
> thickness of the gap to insert.
> 
> The pictures show a 19 mil trace that is transformed into a
> differential pair with thickness 7 mil and gap 5 mil.  This was done
> by typing
> 
> :MakeDifferential(19mil,5mil)
> 
> Caveats:
> 
> * Doesn't support undo properly. Back up your work before running.
> 
> * Doesn't work well with straight line intersections, it creates gaps
> and overhangs at the intersections. The workaround is to use arcs for
> changing direction, as it handles line to arc intersections
> beautifully.
> 
> Enjoy!

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