高精度、稳定的方波信号源对仪器的研制、使用和检测具有重要作用。提出了一种有效提升方波信号源精度和稳 定度的设计方案。该方案利用DDS芯片产生基准方波信号并结合可编程和接口丰富的DSP芯片控制方波频率和调节方波 占空比。由此方案可以设计出信号频率精确稳定、可灵活控制、及大范围精确调节占空比的高性能方波信号发生源。目 前,该方案已应用于L625激光雷达时间延迟和脉冲发生器的研制。同样,该方案也可应用于其他需要高性能信号源的仪器设备。

Generator of square waveform is important in designing, using and maintaining electrical equipment. The requirements of frequent precision and stabilization of the generator is increasing. Design of a generator based on the DDS and DSP chip is presented. In the design, DDS chip generates square waveform. DSP chip controls DDS chip to change the frequency and duty ratio. It is programmable and offers various communication interfaces. The design is adopted for the delay pulse generator of L625 lidar presently. It also can be useful for other equipments which need high-powered signal generator.