Compiled code simulation of analog and mixed-signal systems using piecewise linear modeling of nonlinear parameters: A case study for DeltaSigma modulator simulation

This paper presents a method for fast time-domain simulation of analog systems with nonlinear parameters. Specifically, the paper focuses on analog-to-digital converters (ADC). The method creates compiled-code simulators based on symbolic analysis. Code is optimized using loop invariant elimination and constant folding. Circuits are described as structural macromodels. Non-linear parameters are expressedusing piecewise linear (PWL) models. The paper presents a technique for automatically creating PWL models through model extraction from trained neural networks. As compared to existing behavioral simulation methods for ADC, this technique is more automated and accurate. In our experiments, compiled-code simulation was significantly faster than numerical simulation.