On Tuesday 01 March 2011, John Vodden wrote: > I am trying to find out if gnucap's mixed-mode capabilities > are suitable for my purposes. Basically, I am trying to > model digital control of PWM inverter/rectifier circuits > using ideal switches. I understand that gnucap models > switches as "time-dependant linear devices" and adjusts the > simulation timing accordingly.
Should be. If not, how about helping to add the capability? > Is it possible to write an external model that can set when > the switches will operate? Ideally, this model would be > triggered at regular intervals (rather like a timed > interrupt) and perform calculations based on current or > voltage measurements to determine the instant at which the > switches should change state and somehow schedule the change > of state to take place (perhaps adjusting the control > voltage of a voltage dependant switch?) Yes, but how about a switch and a timed voltage source? Both of these are available now. > I have read about the model compiler in the stable version of > gnucap but I get the impression that this is somewhat > obsolete? I also think that the development version is more > sophisticated than the stable release but I am struggling to > find documentation. I would greatly appreciate it if someone > could point me in the right direction of where to start with > this, or alternatively send me on my way if this is not > something that gnucap is able to do. Documentation for the development version is a wiki .. http://gnucap.org/dokuwiki/doku.php?id=gnucap:manual Technical documentation is at: http://gnucap.org/dokuwiki/doku.php?id=gnucap:manual:tech What is obsolete is the source language. Modelgen was done long ago, before Verilog-A. It needs to accept Verilog-A as the source language. There are several possible approaches. One possible approach is to change modelgen to accept Verilog-A syntax. Other thoughts are to base a replacement on ADMS, Icarus Verilog, or System-C. There have been starts on all of these, but since nobody is getting paid, none of these were finished. _______________________________________________ Help-gnucap mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gnucap
