高精度Sigma-delta调制器系统设计和仿真  

Systematic Design and Simulation of a High Resolution Sigma-delta Modulator

作　　者：石立春[1,2] 杨银堂[1] 吴笑峰[1] 李迪[1] 丁瑞雪[1] 

机构地区：[1]西安电子科技大学微电子学院,宽禁带半导体材料与器件教育部重点实验室,陕西西安710071 [2]西安通信学院,陕西西安710106

出　　处：《湖南大学学报（自然科学版）》2010年第5期54-59,共6页Journal of Hunan University:Natural Sciences

基　　金：国家杰出青年基金资助项目(60725415);国家863项目资助(2009AA01Z256、2009AA01Z258)

摘　　要：提出了一种基于MATLAB/SIMULINK sigma-delta(ΣΔ)调制器系统设计与仿真的方法.该方法首先根据设计目标确定调制器的阶数、过采样率和内嵌量化器位数,优化调制器噪声传输函数NTF的零极点,调整调制器的结构系数,得到性能优化的调制器系统结构;然后通过分析调制器非理想因素,对非理想情况下的调制器基于SIMULINK进行行为级建模与仿真;最后得到调制器子模块电路参数.调制器电路级仿真结果表明由该方法得到模块参数能够有效、可靠的指导调制器的电路设计.Based on MATLAB/SIMULINK,this paper introduced a method of the systematic design and behavioral simulation of the sigma-delta modulator.Through the method,firstly,a performance-optimized modulator structure can be found by defining the order,OSR and the bit number of the inserted quantizer,optimizing the NTF zeros and scaling the structure coefficients of the modulator.Then the non-ideal modulator was modeled and simulated based on SIMULINK through the analysis of the modulator non-ideality,and the modulator sub-circuits performance was acquired finally.The simulation result of the modulator circuit designed under the guidance of the acquired sub-circuits performance shows that the acquired sub-circuits performance can guide the modulator circuit design effectively and reliably.

关 键 词：SIGMA-DELTA调制器 系统设计 行为仿真 非理想性 

分 类 号：TN792[电子电信—电路与系统]