虚拟数字合成信号源设计

Design of Virtual Direct Digital Synthesizer

针对传统信号源输出波形种类有限、调节不连续、频带窄等问题,提出了一种基于虚拟仪器的数字合成信号源设计方案.分析了数字合成信号源基本原理,设计了主要硬件电路,给出了底层驱动程序函数、软件运行界面和主要流程框图.该系统可以完成16种波形输出,幅值和频率连续调节等功能.经过数字示波器对其中四种常见信号测试比较,虚拟数字合成信号源较传统信号源有更高的精度、更小的误差和更好的可移植性,应用前景良好.

Due to the problems of traditional signal source,such as limited types of signals,discontinuous adjustment,narrow band and so on,a design scheme of virtual direct digital synthesizer based on virtual instruments is put forward.What＇s more,the basic principle of digital synthesis signal source is analyzed,the main hardware circuit is designed,the bottom level driver functions,software running interface and main flow chart are also given.This system can complete 16 kinds of wave output,continuous of amplitude and frequency adjustment and other functions.Compared with four kinds of common signal measurement by virtue of digital oscilloscope,the virtual digital signal source has higher accuracy,less error and better portability than that of the traditional signal source.The virtual direct digital synthesizer has good prospects for application.