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Subject:	Re: [geda-help] LTspice netlist to PCB
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From:	John Doty <jpd AT noqsi DOT com>
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Date:	Fri, 22 Jul 2016 12:53:24 -0600
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There=92s an excellent write-up at =
http://wiki.geda-project.org/geda:csygas, including some specifics on =
gschem->LTSpice flow. Stuart=92s spice-sdb gnetlist back end is very =
capable: I used in the design flow for ASICs on the Hitomi space =
mission. Its weakness is simulating schematics intended for printed =
circuit layouts: its heuristics for figuring out how to map printed =
circuit packages onto SPICE models and subcircuits are pretty good, but =
not perfect.

For a more flexible but not so well documented netlist back end, see =
https://github.com/noqsi/gnet-spice-noqsi. With this, you can use the =
same schematic file as input for both simulation and layout. It=92s =
especially useful with hierarchy.

On Jul 22, 2016, at 12:16 PM, John Griessen (john AT ecosensory DOT com) [via =
geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:

> On 07/22/2016 12:46 PM, Keantoken (keantoken AT yahoo DOT com) [via =
geda-help AT delorie DOT com] wrote:
>> I have been doing freehand layout, but I need a ratsnest to cut down =
on errors, or else a very methodical manual error checking
>> procedure.
>=20
> If there are LTSpice circuits that are complex that you want to use, =
the translating links on github might be worth the work ot go straight =
to pcb netlist,
> but if you really want to control your layout and BOM and such, it =
pays to use gschem, or maybe Kicad.
>=20
> And then, see my post about gschem to gnucap using gaw as =
viewer...might be just as good as LTSpice for op-amp filters with
> the makefiles and such from =
http://www.johannes-bauer.com/electronics/gnucap/.  I'll do a write up =
on that with gaw substituted soonish...
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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