i am agree with you about the benefits about hspice. but the only thing i want to describe here is how to generate the netlist, indeed, any tools can capture the circuits and generate netlists are candidates for this tasks. like orcad's capture (not pspice), woffice,composer, and even the Protel, the different is how ease to modify your parts specially for hspice.infomissing123 said:Hspice gives more accurate results than Pspice (Orcad) does. I've used both for the same project and the difference was as much as 0.5V (DC output of an opamp that I designed). As far as netlist generation for hspice, do it by hand. It's surprisingly easy, especially if making digital circuits which have a lot of shared components.