Automated synthesis of macro/behavioral models for mixed analog/digital circuits, including complete power supply effects

Abstract

The authors describe a system for automated generation of macro/behavioral models for SPICE-based simulation. These tools facilitate the generation of parametric models incorporating fixed and/or variable topologies for a wide range of analog and digital blocks. The macro/behavioral models can operate at several levels of complexity. The highest level models accurately emulate model parametric variation with power supply, transient supply currents, and supply interference effects. Two methodologies are available for defining behavioral models for logic blocks. An even-driven native logic simulator, FLOGIC, has been developed to seamlessly interact with the SPICE engine. FLOGIC provides a systematic and convenient method to create behavioral functions. These functions provide higher accuracy by including second-order effects such as dependencies of propagation delay and thresholds on input signals.<>