开关电容ΣΔ调制器的行为级建模

Modeling Switched-Capacitor ΣΔ Modulator on Behavioral Level

在MATLAB的SIMULINK环境下,给出了一套开关电容ΣΔ调制器的时域行为级模型。该模型考虑了SCΣΔ调制器大部分的非线性效应,譬如:时钟抖动、热噪声以及运放的一些限制参数(转换速率、有限DC增益、有限带宽等)。最后给出二阶低通ΣΔ调制器的模拟结果。

Present a set of blocks implemented in the MATLAB SIMULINK environment, whichallows designers to perform time - domain behavioral simulations of switched - capacitor sigma - delta modulators. The proposed set of models takes into account most of the SC ∑△ modulator nonidealities, such as sampling jitter, thermal noise, and operational amplifier parameters （finite dc gain, finite bandwidth, and slew rate）. The results obtained from a second - order low - pass SC ∑△ modulator was given.