基于DDS技術的智能信號發生器的設計

本文提出了一種以直接數字頻率合成（DDS）技術為基礎的信號發生器的設計。采用
單片機AT89C51 控制DDS 芯片AD9850 產生頻率可調的正弦信號，并通過低通濾波器得到純正的信號，最后經過功率放大驅動電路輸出目標信號。該信號發生器用在變壓器繞組變形測試儀中，用來產生頻率自動可調的1KHZ-1MHZ 的掃頻信號。發生器具有頻率精度高，頻率范圍寬，操作快捷方便等優點。
關鍵詞: DDS；AD9850；信號發生器；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