说明：  介绍了DDS(直接数字频率合成)基本原理,提出以DDS芯片AD9850为核心、利用单片 机控制辅以必要的外围电路,构成一个输出波形稳定、精度较高的信号发生器。该信号发生器主要能 产生幅度和频率分别可调的正弦波、方波与三角波。实验结果表明,硬件电路结构简单,输出信号频 率稳定率优于10 - 3 ,幅值误差低于5 。 关键词: DDS 集成芯片 AD9850 信号发生
(Describes the DDS (direct digital frequency synthesis) basic principles, proposed to DDS chip AD9850 as the core, supplemented by the use of microcomputer control of the peripheral circuits necessary to form an output waveform stability and high precision signal generator. The signal generator can generate the main adjustable amplitude and frequency of sine, square and triangular wave. Experimental results show that the hardware circuit structure is simple, the output signal frequency stability of better than 10- 3, amplitude error is less than 5 . Keywords: DDS integrated chips AD9850 signal)