双路多波形可调信号发生器的原理与实现

介绍了一种基于直接数字频率合成（DDS）技术的双路多波形可调信号发生器的设计工作原理与设计方法。利用STC12C5A60S2单片机与2片DDS芯片AD9833进行数字控制相结合，通过矩阵按键实现了双路正弦波、三角波和方波等3种信号和相位差的输出。系统实现了2路输出信号的频率可在1 Hz~2 MHz内连续进行设置，频率分辨力小于1 Hz，相位差在0°~359°内可调，相位误差小于0.1°。采用示波器测试可以看出，输出的波形较为稳定，相位差输出准确，整套系统具有结构简单和操作方便的特点。

Principle and application of multi waveform adjustable signal generator

Base on direct digital frequency synthesis (DDS), the paper introduces working principle and composition of the dual program design technology of high precision signal generator. Using STC12C5A60S2 to control the two pieces of DDS, the paper realizes the output sine wave, triangle wave and dual square wave. Dual signal frequency can be continuously adjustable in the range of 1 Hz~2 MHz and the resolution is less than 1 Hz, the phase difference regulating range is 0°~359° and phase difference resolution is less than 0.1°. Through the matrix keyboard, it can facilitate the realization setting of frequency and phase difference. Using oscilloscope, it can be seen that the output waveform is stable and the output of phase difference is accurate. The system has the characteristics of simple structure and convenient operation.