基于工具软件的直接数字频率合成器设计方法

摘要

Design of DDS signal source based on DSP builder usually uses the method of combining hardware description language with schematic entry. It is very hard for designers, because they must familiar with hardware foundation and hardware design language. To solving this problem, this paper presented a new design method of direct digital frequency synthesis (DDS) based on DSP builder. The method could finish the design of the model in DSP builder, and complete modeling, simulation, system integration in Simulink. This method could greatly shorten the design period by modifying signal frequency through system parameter setting,and it did not need to program complex code. Just by using the DSP builder,designers could undertake the development work with the advantages of strong interaction and simple usage.%利用FPGA设计直接数字频率合成器(DDS),通常是采用硬件描述语言与原理图输入相结合的方法.对设计者的硬件基础要求较高,且要求熟悉硬件电路设计语言,综合性较强.提出一种基于DSP Builder的直接数字频率合成的设计方法,在DSP Builder软件中完成FPGA DDS的模型设计,在Simulink软件中完成图形界面下的建模、仿真和系统集成.设计实例表明:通过系统参数的设置可方便地对信号的频率及相位进行修改,继而缩短了研制周期,为DDS设计提供了一种新的设计方法.该方法无需编制复杂的程序代码,利用DSPBuilder软件友好的图形开发界面就可进行系统设计,且开发环境与QuartusⅡ软件交互性强,便于修改,具有 良好的可重配性.