An adaptive dynamic-element PTA method for solving nonlinear DC operating point of transistor circuits

Pseudo-transient analysis (PTA) method has been researched for many years from the practical viewpoint since it is considered as the most promising method to find DC operating point for transistor-level circuits, which is the most fundamental and difficult task in circuit simulation. However, in many cases, especially for some large-scale circuits or combination circuits which contain different kinds of sub-circuits, different nodes may require different pseudo-capacitor values to converge. Same-rate of step size and capacitor values for all nodes may lead to nonconvergence. In this research, an adaptive dynamic-element algorithm is proposed for PTA method, which inserts dynamic pseudo-element to each transistor respectively, and the values vary according to the simulation states independently and automatically. Numerical examples are shown to illustrate the effectiveness and efficiency of proposed algorithm.