基于DDS技术的智能信号发生器的设计

本文提出了一种以直接数字频率合成（DDS）技术为基础的信号发生器的设计。采用
单片机AT89C51 控制DDS 芯片AD9850 产生频率可调的正弦信号，并通过低通滤波器得到纯正的信号，最后经过功率放大驱动电路输出目标信号。该信号发生器用在变压器绕组变形测试仪中，用来产生频率自动可调的1KHZ-1MHZ 的扫频信号。发生器具有频率精度高，频率范围宽，操作快捷方便等优点。
关键词: DDS；AD9850；信号发生器；功率放大

Design of Intelligent Signal Generator Based on DDS Technology Dong Jungang Cai Zhenjiang Wang Fushun Shao Limin Gao Liai (College of Mechanical and Electrical Engineering, Hebei Agriculture Univer sity, Baoding 071001, China) Abstract：A kind of intelligent signal generator based on direct digital synthesizer technology is proposed in my paper. MCU AT89C51 is adopted to control DDS chip AD9850 to produce the sine signal which frequency may be adjusted. The pure signal can be obtained through the low pass filter, and then target signal is drove by the power amplifier. The signal generator was applied to measure instrument of deformation of power transformer windings for generating the sine signal which frequency during 1KHZ-1MHZ is able to be adjusted automatically. This generator, has such advantages as high frequency precision, wide frequency range, and quickly facilitate and so on.
Key words：DDS；AD9850；signal generator；power amplifier