基于计算机PCI总线的虚拟信号源设计

虚拟仪器是基于个人计算机(PC)作为硬件平台的一种新型仪器,为了充分利用PC机的硬件资源,设计通用性强的虚拟仪器,研究了PCI总线的典型特点及专用接口芯片,建立了基于PCI总线的PCI板卡设计方法,并设计了“多波形信号发生器插卡”。实验结果表明:该设计方法充分利用了PCI总线高速的特点,将直接数字式频率合成器(DDS)软件化,能产生正弦波、三角波、方波、噪声、扫频及其它复杂波形。由该PCI卡构建的虚拟多波形信号发生器可以方便、准确地选择波形和调节波形参数,具有较强的通用性。

The Design of Virtual Multi-wave Signal Generator Based on PCI Bus

The virtual instrument is a new-style instrument based on computer as hardware flat roof. In order to de- sign current virtual instrument with PC's hardware resource,PCI Bus and the interface chip are studied, the method of designing Add-In card is set up base on PCI bus, and the Add-In card of multi-wave signal generator is designed. Experimentation result show:the design method makes use of PCI bus' high speed features, DDS is realized by soft- ware. The signal generator can produce sin, triangle, square, noise, frequency sweep and others complex waves. The virtual multi-wave signal generator can be used to choose wave and to adjust its parameters conveniently and accurate- ly. It has rather strong current.