基于DDS的多功能高精密信号发生器设计

信号发生器是现代电子测量中不可或缺的工具之一,广泛应用于通信、测量、雷达控制等领域。文中基于DDS技术,提出了一种以AD9854为核心的信号发生器设计方法。该设计通过PC机和控制台软件设置输出信号参数,结合单片机对频率控制字进行处理,可产生正弦波、方波以及FSK、ASK等多种调制波形,输出频率最高可达150 MHz,频率分辨率达1 μHz。实验结果表明,该设计具有功能全、精度高、可编程性好等优点。

Design of Multi-function High-precision Signal Generator Based on DDS

The signal generator is an indispensable tool in the modern electronic measuring,and widely used in the field of communication,measurement and radar control.This paper puts forward a signal generator design method based on DDS technology.The design sets signal parameters by PC and processes the frequency control word by MCU,and then produces sine,square,FSK,ASK and other modulation waveforms.The output frequency is up to 150 MHz and the frequency resolution is 1 μHz.Experimental results show that the design has the advantages of full-function,high-precision and excellent programming capability.