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在科研工作中经常需要频率、相位和幅值能够数字调制的线性调频脉冲信号源。文章设计实现了基于直接数字频率合成(DDS)技术的线性调频脉冲信号的产生,介绍了该信号发生器的工作原理、系统组成、接口设计以及软件算法流程,提出了利用计数器控制波形读写和系统时序的方式来实现输出信号的数字调制。实测结果验证了设计方案的合理性和正确性,精确实现了对系统输出波形参数的动态可调。
In research work, chirp signal sources are often required that can be digitally modulated in frequency, phase and amplitude. The article designs and realizes the generation of chirp signal based on direct digital frequency synthesis (DDS) technology. The working principle, system composition, interface design and software algorithm flow of the signal generator are introduced. The counter is used to control waveform read and write and System timing to achieve the digital output signal modulation. The measured results verify the rationality and correctness of the design scheme and accurately realize the dynamic adjustable of the output waveform parameters of the system.