多分量信号的直接数字合成方法与实现
摘 要:传统的方式构建多分量叠加的复杂波形时,需要较大的波形存储容量和复杂的硬件电路设计。针对这一问题,研究了一种多分量信号的直接波形数据合成方法,该方法充分利用FPGA的硬件资源,建立了基于DDS原理的正弦波、三角波和脉冲波的基础分量模型,可直接设置每个基础分量的幅度、频率、相位和脉宽,然后进行多分量波形数据直接叠加,经数模转换后产生模拟波形。还对多分量信号直接数字合成相关误差进行分析,并以单片FPGA为载体设计了28个正弦波分量、2个三角波分量、2个波脉冲分量的直接数字合成电路。该方法的突出优点是可由众多分量构建复杂波形、参数设置方便、模拟电路简单。
关键词:多分量信号;直接数字合成;FPGA
DOI:10.15938/j.jhust.2018.04.011
中图分类号: TH911.7
文献标志码: A
文章编号: 1007-2683(2018)04-0059-05
Abstract:With the traditional way to construct the complex waveform of multiple components, the large waveform storage capacity is needed and the design of the hardware circuit is complex. To solve this problem, in this paper, a method of direct waveform data synthesis of multicomponent signals is studied, making full use of the hardware resource of FPGA, and establishes the basic component model of sine wave, triangle wave and pulse wave based on DDS principle, which can directly set the amplitude, frequency, phase and pulse width of each base component. Then, the multicomponent waveform data is directly superimposed, and the analog waveform is generated after the digital analog conversion. Also, the relative er...
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