虚拟仪器技术中信号源的研究

A study of the waveform of Virtual instrumentation

介绍了虚拟仪器技术的概念、构成、优点及发展方向 ,在消化和吸收VXI总线规范的基础上 ,研究了VXI总线初级接口电路及基于数字波形合成 (DDS)技术的VXI系统平台上信号源发生器功能电路的一种设计方法 .介绍了DDS技术在波形产生功能电路中的应用 ,推出了利用DAC(模数转换器 )实现高精度线性程控的一种方法 .

Concept of VI(Virtual Instrumentation)as well as construction feature and development of it is described.Based on the VXI bus specification,this paper designs the primary interface circuit and presents a method of arbitrary waveform generator's function circuit which is based on the VXI system It mainly introduces the application of DDS technology in the arbitrary wave generator's function circuit,It proposes a method of high rate accuracy programming control by way of DAC.