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Message-ID:	<55A7D999.5020101@ecosensory.com>
Date:	Thu, 16 Jul 2015 11:19:37 -0500
From:	John Griessen <john AT ecosensory DOT com>
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To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Net attributes
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In-Reply-To:	<alpine.DEB.2.11.1507160907360.3383@nimbus>
Reply-To:	geda-user AT delorie DOT com

On 07/16/2015 02:37 AM, Roland Lutz wrote:
> I can currently come up with the following:
>    - managing voltage drop, oscillation, and heat by
>      - keeping trace resistance low and
>      - keeping common trace segments short, and
>    - improving signal quality in differential pairs by minimizing signal
>      run time differences
>
> I'm not an electronics engineer, though

The differential pair attribs that can help also include
1.  smoothness of board material,
	since the waveguide smoothness affects how much mismatch there is and so reflections and in a short
	transmission line in a system, standing wave patterns on the transmission line (differential pair).
2. definition and smoothness of the trace width
	so it does not have blips or sharp edges

For some frequencies, (pcb antennas and feed lines), corners matter, so
3. min radius spec on a trace edge

4a. 4b. 4c. Power decoupling caps needed near a pin  -- three type ranges

5.  attrib category of keep away by X distance.  Add it and a unique name to two nets to keep them apart.

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