I've created a set of symbols and a gnetlist backend for the SWITCAP switched capacitor circuit simulator. You can grab the archive at:
http://www-mtl.mit.edu/~mcmahill/outgoing/geda-switcap-20030329.tar.gz This includes the symbols, gnet-switcap.scm file and an example circuit. You'll need to use this with gEDA >= 20021103. The archive contains a README.txt with a brief description of how to use gEDA to drive a SWITCAP simulation. It assumes you already know how to use gschem and are somewhat familiar with SWITCAP. Also, you'll need your own copy of SWITCAP to run the simulations. Enjoy! -Dan ps. Is there a prefered format for providing documentation on this? I'd be willing to expand the README.txt file a bit and put it in whatever format makes the most sense for inclusion in the main gEDA documentation. Would this be texinfo? html? just plain ASCII?