DDS时域参数分析及优化研究

Analysis of Time Domain Parameters on DDS and Optimization Research

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.