基于虚拟技术的信号发生器的设计与仿真

针对传统信号发生器体积庞大,接口不灵活,系统封闭,不易开发、扩展等缺点,基于直接数字合成技术,以LabVIEW为开发平台设计了一种新型的虚拟信号发生器。通过在LabVIEW环境下编程实现数字信号序列的生成,利用计算机的声卡完成数/模转换和低通滤波。对设计的虚拟信号发生器进行了仿真研究,仿真结果表明,该信号发生器可产生正弦波、三角波、方波、锯齿波以及各种自定义波形,并可根据需要设定波形的参数,实现了数据分析处理、人机交互和显示等功能,具有性价比高、操作简单、扩展性强等优点。

Design and Simulation of Signal Generator Based on Virtual Technology

A new type of virtual signal generator based on direct digital synthesis technology and Lab VIEW is presented in allusion to the traditional signal generator＇s shortcomings： large volume, not flexible interface, closed system, not easy to develop and expand. In the LabVIEW environment, it can generate the digital signal sequence by programming and complete D/A conversion and low-pass filtering by using sound card. By means of simulation on the virtual signal generator, the signal generator can generate sine waveform, triangle waveform, square waveform, sawtooth waveform and a variety of user-defined waveform and can be set waveform parameters according to the requirements. It also has the following functions： data analysis processing, human-computer interaction and displaying with so many advantages such as high cost performance, simple operation and strong expansibility.