On Sunday 25 April 2010, kai-martin knaak wrote: > al davis wrote: > > Ah .. there's a good idea .. "don't have to be exact" .. > > they never are .... Not detailed, but just good enough > > for a beginner. ...... Now we need a volunteer to do it. > > > > Have things like a generic parameterizable op-amp. .. with > > parameters like gain, gbp, and so on. > > Parameterized models are already for the user who got beyond > the first successful projects. For the first steps, there > should be as little room to screw up as possible.
Not really .. remember there are default parameters .. x1 (1 2 3) opamp * all default parameter x2 (3 4 5) opamp gain=10k gbp=1meg slew=10e6 * some parameters specified > 2) diodes: Any generic diode would do. If in doubt, the > parameters of 1N4007 should do. already there, sort of .... .model d d D1 (1 2) d * all default parameters but I think what you are leading to is the need for something to "include" that has several of them with parameters defined. > 6) Opamps: > a) An ideal opamp with essentially infinite > amplification, infinite slew rate, zero bias current, no > input offset, etc. b) A more realistic model of a common > opamp, with bipolar input, e.g. OP07 > c) A more realistic model of a common opamp with FET > input, e.g. TL081 > d) A more realistic model of a common fast opamp, e.g. > LM833 > > 7) Comparators. Like with the opamps, an idealized model > should be complemented with a common real world component. > E.g. LM393 > > 8) Signal source with the capabilities of a simple frequency > generator (sine, square, triangle, pulses, sweep) has one -- spice doesn't Even with the spice-style "PULSE" and others ,, Gnucap lets you specify named values. I can not remember the order of the parameters needed for spice. > This set of components would already allow for lots of non > trivial simulation. Looks like it would be a nice package ,, Just "include" it in the netlist. > Other integrated components like analog > switches, voltage constants, transformers, or mixers would > be nice to have. But they are not essential to get started. > > > The vast majority of gnucap users are not geda users. > > This might change, if geda provides a way from schematic to > simulation that is as straight forward as the way from gschem > to pcb. I keep hoping. Another need is post-layout simulation. The dedicated SI simulators (Hyperlynx and others) have import filters for all of the commecial layout programs. We can have that too. I have IBIS stored away waiting for a reason to revive it. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
