Mixed-mode circuit simulation package converges reliability, speed

Pulsonix Spice is a low cost, advanced mixed-mode circuit simulation package that boosts performance in terms of convergence reliability and speed. Product is fully integrated into the firm’s Schematics environment. Product is based on a substantially enhanced version of SPICE 3 and XSPICE, while the underlying algorithms have been reworked to provide new analysis modes to improve convergence and speed.

http://www.pulsonix.com/simulation.asp