Direct digital synthesis: a tool for periodic wave generation (part 1)
Direct digital synthesis: a tool for periodic wave generation (part 1)
复制标题
直接数字合成：周期波生成工具（第 1 部分）
DOI：
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发表时间：
2004
影响因子：
14.9
通讯作者：
Lionel Cordesses
中科院分区：
文献类型：
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作者：
Lionel Cordesses
振荡器是深入研究的课题。从科尔皮茨振荡器锁相环，方法已提出，以提高稳定性，频率分辨率和频谱纯度。在全数字方法中，直接数字频率合成现在可以作为集成电路使用，它们输出的波形高达数百兆赫兹。虽然DDS在新系统设计中逐渐得到认可，但即使在今天，用于改善生成波形质量的方法也很少使用。本文的目的是概述DDS的基础知识，以及计算信号特性边界的简单公式。此外，提出了几种方法，其中一些已获得专利，以克服基本DDS的一些限制，重点是提高输出信号质量。
Oscillators are the subjects of intensive research. From Colpitts oscillators to phase locked loops, methods have been proposed to improve stability, frequency resolution, and spectral purity. Among the all-digital approaches, direct digital frequency synthesis are now available as integrated circuits and they output waveforms up to hundreds of megahertz. While DDS is slowly gaining acceptance in new system designs, methods used to improve the quality of the generated waveform are seldom used, even nowadays. The purpose of this article is to give an overview of the basics of DDS, along with simple formulas to compute bounds of the signal characteristics. Moreover, several methods, some patented, are presented to overcome some of the limits of the basic DDS with a focus on improving output signal quality.