Direct digital synthesis (DDS) architectures are becoming more prevalent as modern digital-to-analog converter (DAC) and programmable logic devices evolve to support higher bandwidths. The DDS architecture provides the benefit of digital control but at a cost of generating spurious content in the spectrum. The generated spurious content may cause intermodulation distortion preventing proper demodulation of the received signal. The distortion may also interfere with the neighboring frequency bands. This article presents the various DDS architectures and explores the DDS architecture which provides the most digital reconfigurability with the lowest spurious content. End-to-end analytical equations, numerical and mathematical models are developed to determine the location and power levels of spurs. Afterwards, the analytical equations, numerical and mathematical models are shown to be consistent with the experimental data. A developer can use the information to design a DDS architecture that meets their minimum requirements.

中文翻译：

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端到端直接数字合成仿真和数学模型，可最大限度地减少数字信号生成的量化效应


随着现代数模转换器 (DAC) 和可编程逻辑器件不断发展以支持更高带宽，直接数字合成 (DDS) 架构变得越来越普遍。 DDS 架构提供了数字控制的优势，但代价是在频谱中生成虚假内容。生成的寄生内容可能会导致互调失真，从而妨碍接收信号的正确解调。失真还可能干扰相邻频带。本文介绍了各种 DDS 架构，并探讨了 DDS 架构，该架构提供了最大程度的数字可重构性和最低的虚假内容。开发端到端分析方程、数值和数学模型来确定杂散的位置和功率水平。随后，解析方程、数值和数学模型与实验数据一致。开发人员可以使用这些信息来设计满足其最低要求的 DDS 架构。