本文提出了一種以直接數(shù)字頻率合成（DDS）技術(shù)為基礎(chǔ)的信號發(fā)生器的設(shè)計(jì)。采用
單片機(jī)AT89C51 控制DDS 芯片AD9850 產(chǎn)生頻率可調(diào)的正弦信號，并通過低通濾波器得到純正的信號，最后經(jīng)過功率放大驅(qū)動(dòng)電路輸出目標(biāo)信號。該信號發(fā)生器用在變壓器繞組變形測試儀中，用來產(chǎn)生頻率自動(dòng)可調(diào)的1KHZ-1MHZ 的掃頻信號。發(fā)生器具有頻率精度高，頻率范圍寬，操作快捷方便等優(yōu)點(diǎn)。
關(guān)鍵詞: DDS；AD9850；信號發(fā)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