DDS时域参数分析及优化研究  

Analysis of Time Domain Parameters on DDS and Optimization Research

作　　者：宋跃[1,2] 张小平[2] 周明辉[2] 

机构地区：[1]东莞理工学院电子工程系,广东东莞523808 [2]湖南科技大学信息与电气工程学院

出　　处：《电子测量与仪器学报》2006年第1期60-63,共4页Journal of Electronic Measurement and Instrumentation

基　　金：湖南省自然科学基金项目(编号:02JJY5011)省科技攻关资助项目(编号:03GKY3046)省教育厅重点资助项目(编号:02A051)

摘　　要：DDS直接数字合成时,由于相位截断、非均匀采样而造成波形重构时时域参数如频率、周期、占空比的误差,特别在频率很低、频率较高时尤为突出。本文从DDS的基本原理和通用电路出发,对时域参数进行了数学模型构造和理论分析, 提出了时域参数微观与宏观效应的概念,得出了误差结论与特性,找到了优化时域精度的有效途径和方法,理论研究和仿真与实验结果完全吻合。When the wave is reconstructed by Direct Digital Synthesis, the error of time - domain parameters such as frequency, cycle, pulse duration ratio would been preduced because of phase truncation and nonuniform sample, especially in the case of low and high frequency. In terms of fundamental principles and common circuitry of DDS, the mathematical model was constructed, theoretic analysis was carried through for time-domain parameters in the article, microcosmic and macroscopical effect were put forward, the error conclusion and property were got, the way of optimizing the time domain precision was found, the theoretic study was in accord with simulation and experiment result.

关 键 词：DDS 非均匀采样 相位截断 时域参数误差与优化 

分 类 号：TN74[电子电信—电路与系统] TQ320.52[化学工程—合成树脂塑料工业]