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直接数字频率合成属于第三代频率合成技术,它具有频率分辨率高、转换时间快、集成度高、相位噪声低等优点,因此被广泛用于各种雷达、通信以及电子系统领域中。为了实现基于直接数字频率合成技术的模块化设计,采用微控制器与集成芯片AD9833配合工作的硬件结构,设计了该模块工作流程控制软件。对设计的模块实物的输出信号测试结果表明,该频率发生模块的频率准确,相位噪声满足实际系统要求。
Direct digital frequency synthesis is the third generation of frequency synthesis technology, it has the advantages of high frequency resolution, fast conversion time, high integration, low phase noise, it is widely used in various radar, communications and electronic systems. In order to realize the modular design based on the direct digital frequency synthesis technology, the hardware structure of the microcontroller working with the integrated chip AD9833 is designed and the workflow control software of the module is designed. The test result of the output signal of the designed module shows that the frequency of the frequency generating module is accurate and the phase noise meets the actual system requirements.