1、基于 FPGA 的 DDS 设计 I 基于 FPGA 的 DDS设计 摘 要:直接数字频率合成(DDS)技术采用全数字的合成方法,所产生的信号具 有频率分辨率高、频率切换速度快、频率切换时相位连续,输出相位噪声低和可 以产生任意波形等诸多优点。 本文在对现有DDS技术的大量文献调研的基础上,提出了符合FPGA结构的 DDS设计方案并利用MAXPLUS软件在ACEX1K系列器件上进行了实现,详细 的介绍了本次设计的具体实现过程和方法, 将现场可编程逻辑器件FPGA 和DDS 技术相结合,具体的体现了基于VHDL语言的灵活设计和修改方式是对传统频率 合成实现方法的一次重要改进。FPGA器件作为系统
2、控制的核心,其灵活的现场 可更改性,可再配置能力,对系统的各种改进非常方便,在不更改硬件电路的基 础上还可以进一步提高系统的性能。文章给出仿真结果,经过验证本设计能够达 到其预期性能指标。 关键词:关键词:直接数字频率合成器;硬件描述语言;现场可编程门阵列; 毕业论文最佳的选择。 基于 FPGA 的 DDS 设计 II The Design of DDS based on FPGA Abstract: : The DDS(Direct Digital Frequency Synthesis) technique adopts full-digital synthesis methods. Th
3、e generated signals have advantages of high frequency resolutions, fast frequency switching, continuous phase while frequency switching, low noise phase and being able to generate arbitrary waveforms. In this paper, after reviewing a lot of literatures published on DDS technology, DDS scheme based o
4、n FPGA structure are proposed, and then implemented in ACEX1K series FPGA using MAXPLUS tool.the paper introduced the concrete implementation process, this way associates DDS with field programmable gate array(FPGA) technology , the way based on VHDL is flexible in designing and modifying, which is a important innovation to the tradition synthesize way, FPGA device control core as system, its flexible scene can altering, can dispose ability again, very convenient to various kinds of improveme