本文提出的采用DDS作为信号发生核心器件的全数控函数信号发生器设计方案，根据输出信号波形类型可设置、输出信号幅度和频率可数控、输出频率宽等要求，选用了美国A／D公司的AD9850芯片，并通过单片机程序控制和处理AD9850的32位频率控制字，再经放大后加至以数字电位器为核心的数字衰减网络，从而实现了信号幅度、频率、类型以及输出等选项的全数字控制-In this paper, the use of DDS as a signal of the whole core of the device function signal generator digital design, according to the type of output signal waveform can be set, the output signal amplitude and frequency can be CNC, such as output frequency width requirements, selection of the United States A/D Company the AD9850 chip, and AD9850 single-chip control and handling of 32-bit frequency control word, and then amplified by the increase to a Digital Potentiometers Digital decay at the core network, in order to achieve a signal amplitude, frequency, type and output Options such as all-digital control