无相位截断误差的DDS设计实现

None Phase Truncation Error DDS Implementation

通过修改传统的直接数字合成(DDS)设计方法,提出了一种无相位截断误差的DDS设计方案.该方案降低了系统正弦采样存储表的需求空间,减轻了存储量对提高信号精度的限制,消除了传统设计中相位截断给最终输出信号频谱的影响,提高了DDS的性能.该方案可以应用于载波合成,频偏调制等通信信号处理领域,可采用FPGA,DSP,MCU等各种硬件平台予以实现.

By modifying the traditional Direct Digital Synthesizer（DDS） design method,a novel solution without phase truncation error is introduced in this paper.It has reduced the storage requirement for the sine-wave samples,eliminated the storage limitation to the signal precision improvement,and avoided the infection which comes from the phase truncation error to the final signal spectrum;consequently,the DDS performance is meliorated.This method is applicable in carrier generation,frequency-offset modulation and some other communication signal processing area,and could be implemented on many hardware platforms such as FPGA,DSP and MCU.