过采样∑Δ调制器结构参数设计自动化

采用基于最小偏差逼近多项式和递推法求解待定系数方程的方法 ,开发了一套内插式过采样 ∑ Δ调制器设计自动化软件 ,动态调整调制器的结构参数 ,使∑ Δ调制器的性能得到优化 .给出了一个具体的内插式∑ Δ调制器的设计实例 ;为了解设计的性能 ,给出了该∑ Δ调制器的谱特性 .实验结果证明 ,使用该自动化软件 ,可以进行采用过采样技术的数 -模转换器中内插式∑ Δ调制器的参数设计

Structural Parameter Design Automation of Oversampling Sigma-Delta Modulator

A design automation software system of interpolative oversampling sigmadelta modulator was developed based on the method of minimal deviation approximating polynomial and the algorithm of recursion to solve equations with undetermined coefficients. The system can calculate structural parameters dynamically, and the performance of modulator can be optimized. A detailed design example of interpolative oversampling sigmaelta modulator was presented. Spectrum analysis of this modulator was given to verify the performance of the result of this design software. The result of experiments shows that this kind of design technique is effective and can be applied in the parameters design for interpolative oversampling sigma-delta modulator in D/A converter.