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A Mixed-Mode Analogue and Switch Level Simulator

This paper describes an experimental mixed-mode simulation system which couples an incremental time analogue simulator to an event-driven switch level simulator. the analogue timing programme uses a variable-step-size, multi-order (VSMO) numerical integration algorithm which detects and uses latency while maintaining wave-form synchronization. the switch level programme uses piecewise linear wave-forms rather than discrete states to model the operation of logical networks. A unified format in which time responses are events is used for communication between the two programmes. the mixed-mode simulator operates without backtracking or translation between logical states and analogue wave-forms.