基于DDS技术多功能信号发生器，拥户可通过键盘输入所需频率信号的数据，利用单片机STC89C52传送出相应的频率控制字，并对DDS芯片AD9833进行编程，幅度的调节由可调电位器实现，最终得到所要求的输出波形- Multifunctional signal generator，In this system user can input the frequency data through a keyboard, and the microcontroller STC89C52 will transmit the relevant frequency control word, then we can program to control DDS chip which is the Analog Devices AD9833.Adjustable potentiometer can adjust the amplitude range,so that we can get the required waveform.