Re: gEDA-user: Library of gnucap and ngspice compatible models?
Alan, I don't do any simulation with gEDA (yet). I would like to though, having a point of call for simulation models would be another barrier to entry broken down. Would it be possible for checked spice models that can be redistributed to be uploaded to gedasymbols.org? Andrew On Wed, Sep 16, 2009 at 12:21 AM, asom...@gmail.com wrote: I, and judging from the mailing lists and forums many others, are frustrated by the difficulty of finding spice models that are compatible with open-source circuit simulators. Common replies are you don't need that level of detail or find a model library buried in the vendor's website, pick a model for a part similar to yours, then alter any lines containing X and replace .subckt Y with a reference to your Z. But that's annoying, especially for users who are new to these simulators. I started collecting and adapting models to be used with my program, http://mrfilter.sourceforge.net , but then realized that the problem is much larger than my single app, and a comprehensive library would badly bloat my downloads. So my question is, should I make a new project which is a library of models to use with open source simulators? I think that there is a need for such a thing, but would it be a good idea? Licensing should not be a problem; most vendors license their models to permit redistribution. Would it be better to incorporate these into some existing project than to start a new one? For that matter, has somebody already done this and I'm just duplicating effort? And finally, what extension should a spice model's filename have? There sadly seems to be no consensus to that last question. -Alan Somers ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user -- ╒═╕ Andrew Whyte MEng CEng paramita ltd ╞═╡ @ - a...@paramita-electronics.com ⌨ - www.paramita-electronics.com ☎ - +44 (0) 79 81 01 61 85 ╘═╛ paramita ltd, is a limited company registered in England and Wales. Registered number: 6631289. Registered office: 788-790 Finchley Road, London, NW11 7TJ (please use trading address for normal correspondence) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Library of gnucap and ngspice compatible models?
Hi Alan, On Mittwoch, 16. September 2009, asom...@gmail.com wrote: So my question is, should I make a new project which is a library of models to use with open source simulators? I think that there is a need for such a thing, but would it be a good idea? Licensing should not be a problem; most vendors license their models to permit redistribution. Would it be better to incorporate these into some existing project than to start a new one? For that matter, has somebody already done this and I'm just duplicating effort? Some time ago I wrote a prototype to collect and test spice models. http://www.h-renrew.de/h/spicelib/doc/index.html The prototype contains the description how to automatically collect the models. It is not a collection of models. You don't have to redistribute the models and you don't need the permission of the vendor to redistribute them. And finally, what extension should a spice model's filename have? There sadly seems to be no consensus to that last question. I just don't care about it. (.mod, .txt, ...) Regards Werner ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Library of gnucap and ngspice compatible models?
That script looks good; I'll take a look at it. On Wed, Sep 16, 2009 at 3:56 AM, Werner Hoch werner...@gmx.de wrote: Hi Alan, On Mittwoch, 16. September 2009, asom...@gmail.com wrote: So my question is, should I make a new project which is a library of models to use with open source simulators? I think that there is a need for such a thing, but would it be a good idea? Licensing should not be a problem; most vendors license their models to permit redistribution. Would it be better to incorporate these into some existing project than to start a new one? For that matter, has somebody already done this and I'm just duplicating effort? Some time ago I wrote a prototype to collect and test spice models. http://www.h-renrew.de/h/spicelib/doc/index.html The prototype contains the description how to automatically collect the models. It is not a collection of models. You don't have to redistribute the models and you don't need the permission of the vendor to redistribute them. And finally, what extension should a spice model's filename have? There sadly seems to be no consensus to that last question. I just don't care about it. (.mod, .txt, ...) Regards Werner ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Library of gnucap and ngspice compatible models?
On Tuesday 15 September 2009, asom...@gmail.com wrote: I, and judging from the mailing lists and forums many others, are frustrated by the difficulty of finding spice models that are compatible with open-source circuit simulators. Yes. It's a problem. It's the kind of problem that will require constant attention to keep it up. Common replies are you don't need that level of detail or find a model library buried in the vendor's website, pick a model for a part similar to yours, then alter any lines containing X and replace .subckt Y with a reference to your Z. But that's annoying, especially for users who are new to these simulators. I confess Find a model ... alter any I admit telling people that. I don't like it, but that's all we have. you don't need that level of detail ... When I said that, I can see that the asker is buried in complexity and needs to simplify. It's a different problem. There is a problem with teachers that show simulation as draw the picture, push a button, and scope-like picture magically comes out. When I was teaching, I tried to do better, but it's a real battle. So my question is, should I make a new project which is a library of models to use with open source simulators? I think that there is a need for such a thing, but would it be a good idea? I think the best approach is a wiki, a way to get tarballs from the wiki, a way to search, and simple way to access it inspired by the way Linux distros install from their repository. The more I think about it, the more it looks like what Linux and BSD distros are doing with applications. Make a plan for how it is organized, begin to populate it, and invite others to help. There is lots of space on the Gnucap wiki. It's not just Spice models. There will never be a significant number of Gnucap models. Rather, Gnucap needs to read standard models, and models designed for other simulators and other uses. Looking forward, Verilog-AMS, VHDL-AMS, and System-C are becoming more popular. Looking back, there are lots of IBIS models. There is also different meanings of model. To some, it is a spice .model statement or subcircuit. To others, it is the C code with the actual model equations. It's really models that depend on other models, which may or may not already be there. Licensing should not be a problem; most vendors license their models to permit redistribution. Licensing really is a problem. It goes the whole range from freely redistributable to available only after signing a nondisclosure agreement. If you look at any of the Linux distros, you will see ways of dealing with it. Would it be better to incorporate these into some existing project than to start a new one? I think you need to start a new one. I have space for you at gnucap.org. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: import of PCB models and footprints
Is there a web list of all symbols that come with the install, and more importantly, what types of definitions can be imported? I just got new AD9970 pre-production samples, and Analog provides the footprints for: MultiSim, Orcad, Protel99, Allegr , Boardstation, PowerPCB, Protel99PCB, and Spice Models [1]http://www.analog.com/zh/audiovideo-products/cameracamcorder-analog -front-ends/AD9970/products/symbols-footprints.html?display=popup If this is in the docs somewhere please link me - I couldn't find it. I did see spicelib and it looks interesting, and Python is my main lang now. Thank you, Ray References 1. http://www.analog.com/zh/audiovideo-products/cameracamcorder-analog-front-ends/AD9970/products/symbols-footprints.html?display=popup ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
