Improved SPICE3 implementation algorithms of compound element pseudo-transient analysis for solving nonlinear dc circuits
This paper presents three implementation algorithms of compound elements pseudo-transient analysis to find DC solutions for nonlinear LSI circuits. In former researches, CEPTA was implemented in SPICE-like simulator with the merits that the size of Jacobian matrix is not expanded during the calculation. While the inserted pseudo parts are converted to some certain equivalent circuits, the conventional implementation does not consider time step size limitation. They can not ensure convergence (DC solution can be found) and for large scale circuits, the CPU time needed to converge is not satisfactory. The proposed implementation algorithms can significantly improve the simulation efficiency for some test cases. The improvement of simulation efficiency and convergence performance is demonstrated by test circuits.