张新,吴凤云,王帆

• 1:西安邮电大学电子工程学院
• 2:西安邮电大学通信与信息工程学院

摘要(Abstract)：

提出一种结合傅里叶级数展开和DDS原理产生任意波形信号发生器的实现方法。利用FPGA设计了15个DDS模块,将一周期正弦波的样值写入DDS模块的ROM表。对目标信号进行傅里叶变换得到信号各次谐波的频率和幅值,取其1~15次谐波的频率作为每个DDS模块的频率控制字,将各个DDS模块输出的样值与输入该模块的频率对应谐波幅值的乘积进行累加,经低通滤波器输出最终所需波形。测试表明,利用该实现方法得到的信号发生器输出波形稳定、频率转换速度快、精度在0.002 79 Hz以内。

关键词(KeyWords)： FPGA;DDS;谐波合成;信号发生器;ROM;频率转换速度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(61271020);; 西安市科技计划项目资助项目(CXY1117(5))~~

作者(Author): 张新,吴凤云,王帆

DOI: 10.16652/j.issn.1004-373x.2018.02.044

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