A Signal Driven Large Mos-capacitor Circuit Simulator

A software organization of a new circuit simulator, SAMOC (Switchedcapacitor Analysis of MOs Circuit) is presented in this paper. SAMOC employs extremely simplified, piecewise linear, resistive models to represent the semiconductor devices such as MOS transistors and ideal diodes in the simulated circuits. SAMOC also supports ideal switches and ideal capacitors for analyzing switched-capacitor networks, which are a weak point in a SPICE simulation. In order to improve the circuit simulation efficiency, circuit partitioning via circuit block extraction is employed by SAMOC. While reading specified devices a posterior-prior relationship is established between each two blocks. SAMOC then creates a block directed graph called signal-block diagram, which can set circuit blocks order for analysis. The DC analysis is accomplished by analyzing all circuit blocks in the order set by the signal-block diagram. An event driven, dynamic simulation, induced by changing the inputs or the internal signals, is performed on the blocks in the path of the signal propagation.