具有双重结构的多通道任意波形发生器设计

发布时间：2018-06-15 17:44

本文选题：双重结构 + 直接数字合成　；参考：《中国测试》2017年07期

【摘要】：直接数字合成(direct digital synthesizer,DDS)技术在输出高频信号时容易造成信号失真且杂散较大,限制其应用领域。通过对DDS信号杂散的分析,提出一种具有双重结构的多通道任意波形发生器设计方案,在DDS波形发生器的基础上增加数据顺序输出模块以弥补DDS信号的不足。采用FPGA构建DDS频率合成器,间隔输出波形数据,实现DDS信号输出;利用DDS频率合成技术产生数据顺序输出模块的数据输出时钟,通过改变数据输出时钟控制信号输出频率,最终达到信号输出且频率可调。实验表明:输出频率达到2 MHz时DDS已经出现明显失真,而顺序输出模块则可以很好地还原实际波形,但DDS具有明显的频率调节优势,两者相互补充,具有较好的应用价值。
[Abstract]:Direct digital synthesizer digital (DDS) technology is easy to cause signal distortion and stray when it outputs high frequency signal, which limits its application field. Based on the analysis of the spurious DDS signal, a design scheme of multi-channel arbitrary waveform generator with dual structure is proposed. The data sequential output module is added to the DDS waveform generator to make up for the deficiency of DDS signal. The DDS frequency synthesizer is constructed by FPGA, the waveform data is output at intervals, the DDS signal output is realized, the data output clock of the data sequence output module is generated by the DDS frequency synthesis technology, and the output frequency of the signal is controlled by changing the data output clock. Finally, the signal output is achieved and the frequency is adjustable. The experimental results show that the DDS has obvious distortion when the output frequency is up to 2 MHz, while the sequential output module can restore the actual waveform very well. However, DDS has obvious advantages of frequency regulation, and they complement each other and have good application value.
【作者单位】：河南科技大学机电工程学院;洛阳银杏科技有限公司;
【基金】：国家自然科学基金项目(51205108) 河南省高校重点科研基金项目(15A535001)
【分类号】：TN741

【参考文献】