电子信息工程 外文翻译 英文文献 借助DDS的精密频率的一种替代方法.doc

word文档可自由复制编辑 An alternative method of precise frequency by the aid of a DDS Contents A method of frequency measurement based on a closed loop composed mainly of a Frequency Comparator (FC) and a Direct Digital Synthesizer (DDS) is presented in this paper. The DDS serves as reference sinewave sign