A new ideal switch model for time-domain circuit analysis

Abstract

An ideal switch model may be needed for the simulation of various real and idealized circuits. A straightforward implementation of an ideal switch model may, unfortunately, produce a zero pivot during the circuit matrix decomposition. In order to avoid such problems a new model of the switch is proposed that retains the structure of the non-zero elements in the circuit matrix, no matter what is the state of the switch. This excludes singularity problems. The switch is viewed as a nonlinear two-terminal element changing its resistance from zero to infinity, thus simulating a closed and open switch, respectively.