A SIMULINK-based approach for fast and precise simulation of switched-capacitor, switched-current and continuous-time ΣΔ modulators

This paper describes how to extend the capabilities of SIMULINK for the time-domain simulation of ΣΔ modulators implemented by using switched-capacitor, switched-current and continuous-time circuits, considering the most important error mechanisms. The behavioural models of these circuits are incorporated into the SIMULINK environment by using C-language S-function blocks, which leads to a drastic saving in the simulation time as compared to previous approaches based on MATLAB functions. The outcome is a complete SIMULINK block library that allows interactive, fast and accurate simulation of an arbitrary ΣΔ topology.