一种数字式移相信号发生器的设计与实现

Design and Implementation of Digital Phase Shift Signal Generator

随着现代电子测量技术的发展,能够产生各种波形信号的数字式信号发生器的应用越来越广泛。介绍了一种双通道数字式移相信号发生器的设计方法,该信号发生器以单片机和CPLD为核心,主要采用了直接数字频率合成(DDFS)、直接存储器存取(DMA)、数字移相和数字调幅等技术,可以产生幅值可变的任意波形,也可以通过改变单片机程序随意改变该信号发生器的特征。整个系统简易灵活,具有英文菜单显示和键盘输入,可作为信号源应用于科研和教学实验。

Following the development of technologies of modem electronic measurement, the use of digital signal generators which generate all kinds of waveforms has become more and more popular. The design method of a dual-channel digital phase shift signal generator is presented. The signal generator is based on CPLD and MCU, and adopting technologies of DDFS, DMA, digital phase shift and digital amplitude modulation. It is capable to generate any waveform with variable amplitude. In addition, the characteristics of the generator can be adjusted by changing program of single chip computer. The system is simple and flexible, providing with English menu display and keyboard input. It can be used as signal generator for experiments of research and education.