MIXMOS - A MIXED-LEVEL SIMULATOR FOR DIGITAL MOS CIRCUITS USING A NEW ALGEBRAIC APPROACH

The paper presents a new mixed-level simulation tool for digital VLSI circuits implemented in MOS technology. A digital circuit is described as an interconnection of gate-and switch-level models. A new algebraic structure, comprised of algebras for the gate and switch levels, is developed to achieve consistency and accuracy between the two different levels of abstraction. Based on these algebras two evaluation algorithms - one for the gate level and the other for the switch level - are developed to handle Boolean expressions and switch-level descriptions, with the strength capability that is usually needed to simulate MOS circuits. The combination of the two algorithms results in a mixed-level MOS simulator, MixMOS, which achieves switch-level accuracy with performance that approaches that achieved by gate-level simulators.