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.
出处
《自动化仪表》
CAS
北大核心
2011年第3期61-63,67,共4页
Process Automation Instrumentation
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
Direct digital frequency synthesis（DDFS） Phase control Phase accumulator Signal generator Frequency synthesizer
