文献类型：期刊文献

中文题名：直接数字频率合成低频信号源的设计与实现

英文题名：Design and Implementation of the Low Frequency Signal Generator Based on the Method of Direct Digital Frequency Synthesis

作者：邹尔宁[1];谢忠屏[2]

第一作者：邹尔宁

机构：[1]北京联合大学信息学院;[2]北京联合大学电子信息技术实验实训中心

第一机构：北京联合大学智慧城市学院

年份：2011

卷号：32

期号：3

起止页码：61-63

中文期刊名：自动化仪表

外文期刊名：Process Automation Instrumentation

收录：CSTPCD;;北大核心:【北大核心2008】；

语种：中文

中文关键词：直接数字频率合成;相位控制;相位累加器;信号发生器;频率合成器

外文关键词：Direct digital frequency synthesis（DDFS） Phase control Phase accumulator Signal generator Frequency synthesizer

摘要：直接数字频率合成DDFS技术具有高分辨率、频率切换相位连续和易于集成等优点。根据DDFS的基本原理和性能特点,以正弦波为例,提出了直接数字合成信号源的设计方案,实现了DDFS在频率可控的任意波形合成器中的应用。在此方案中,调整时钟频率、累加器输入位数和累加器容量,可使输出频率覆盖超低频和低频,使频率覆盖系数k达到109;同时,调整时钟频率与累加器容量的比值,还可得到任意所需的分辨率。
Direct digital frequency synthesis（DDFS） features advantages of high resolution,phase continuous upon frequency switching and ease integration.By adopting DDFS basic principle and performance characteristics,with sine wave as example,the strategy for designing signal generator based on DDFS is proposed,the application of DDFS in any frequency controllable waveform synthesizer can be implemented with this strategy.The output frequency can cover ultra low frequency and low frequency and make the frequency coverage coefficient k=109 only by adjusting clock frequency,number of input digits and capacity of the accumulator.In addition,any resolution needed can be reached by adjusting the ratio of clock frequency and capacity of accumulator.