Numerical simulation of oversampled switched-capacitor circuits

Abstract

The paper presents a software tool for the analysis of oversampled switched-capacitor delta-sigma modulator as a main part of high-resolution A/D converters - delta-sigma ADC. Two hierarchical levels have been considered for modulator simulation: idealized behavioral level and non-ideal circuit level. The program is written in MATLAB and allows the most relevant non-ideal parameters of the components to be taken into account. Among these parameters are limited switch resistances and gain-bandwidth product of active devices. Simulation of pattern and idle noises are considered as well.