摘要
针对直接数字频率合成技术固有的杂散特性大幅地限制了其应用问题。文中在分析DDS工作原理及杂散噪声来源的基础上,发现利用改变直接数字频率合成器芯片频率步进可改善频率合成器产生信号的带内杂散。采用一个以AD9858芯片为核心的硬件平台进行实物对比测试,验证了频率步进控制字越小其合成信号的带内杂散越低。
Direct digital frequency synthesis technology has important position in the field of frequency synthesis,but the connatural spur characteristic greatly limits its application development. In this paper,based on the analysis of working principle of the DDS and spurious noise source,we found that delta frequency tuning words change of direct digital frequency synthesizer chip can improve Spurious in band. Adopting a AD9858 chip as the core physical contrast test on the hardware platform,verify the delta frequency tuning words is smaller,the lower Spurious in band of direct digital frequency synthesis.
出处
《电子科技》
2016年第6期79-81,共3页
Electronic Science and Technology
