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提出并构建了开关电容积分器Delta Sigma调制器非理想因素行为级模型,该模型基于Matlab中的Simulink工具,包含开关非线性、时钟抖动、量化器非线性和积分器非线性等调制器非理想因素,能为电路模块的设计提供精确的设计指标.重点研究并实现一种运放非线性直流增益模型,仿真结果表明它能更有效反映奇次谐波失真.同时综合考虑调制器其他非理想因素,例如采样噪声、开关非线性电阻以及运放参数(色化噪声,增益带宽,摆率,饱和电压),仿真得到其对调制器性能的影响.
A non-ideal behavioral model of switched-capacitor integrator Delta Sigma modulator is proposed and constructed. The model is based on the Simulink tool in Matlab and includes non-ideal modulator such as switching nonlinearity, clock jitter, quantizer nonlinearity and integrator nonlinearity Which can provide the accurate design index for the design of the circuit module.It focuses on the research and implementation of a nonlinear DC gain model of the op amp and the simulation results show that it can more effectively reflect the odd harmonic distortion.At the same time, Factors such as sampling noise, switching non-linear resistance, and operational amplifier parameters (chrominance noise, gain bandwidth, slew rate, saturation voltage) simulate the effect on modulator performance.