DDS中实现相位至幅度映射的一种新方法  

A New Technique of Mapping from Phase to Amplitude in Direct Digital Frequency Synthesizer

作　　者：张玉良[1] 吴伟陵[1] 田宝玉[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2003年第2期95-99,共5页Journal of Beijing University of Posts and Telecommunications

摘　　要：提出了直接数字频率合成器(DDS)中相位至幅度映射的一种新方法.通过联合运用抛物线近似和线性近似实现了对正弦信号的高精度近似,所产生的最大谐波电平为-56.7dB的正弦信号,可直接应用于许多场合.辅以少量ROM则可以进一步提高输出正弦信号的精度.A new technique of mapping from phase to sine amplitudes in direct digital frequency synthesizer (DDS) is presented in this paper. Through using parabolic approximation and linear approximation together, sine function signal is approximated with highly accuracy. The generated sine function signal with the maximum harmonic level of 567 dB can be used directly in many situations. With the aid of few ROM the accuracy of the generated sine function signal can be improved even more.

关 键 词：DDS 直接数字频率合成器 抛物线近似 软件无线电 正弦信号 性能仿真 

分 类 号：TN742.1[电子电信—电路与系统]