Design Of Virtual Spectrum Analyzer Based On PCI Bus

By NI company to put forward the concept of virtual instrument Since the 1980s,Along with the computer technology more mature, Electronic measurement technology is developing rapidly, Virtual instrument in several fields, it reflects the superiority,Gradually replace part of the tradition of instruments, produced a great social benefits. Traditional spectrum analyzer is very expensive and bulk. According to the property, This topic in the virtual spectrum analyzer for research object, Using computer technology, combining the PCI structure characteristics, the purpose is to develop a can replace traditional spectrum analyzer instrument.This topic in carefully analyzed the PCI bus technology based on knowledge, In PCI9054 interface chip as the core, the software and hardware interface circuit analysis, In the hardware platfor, ealizing the complex large-scale programmable integrated circuits (FPGA )design, Using the latest models on the market at present the A/D chip, Using a common realized the computer and data acquisition card can substitute the circuit structure and operation are very complicated traditional spectrum analyzer, And in the performance of continuous, high speed, high capacity, multi-channel high speed data acquisition system implementation scheme.Software design, programming language with graphical LabVIEW software platform, the software drivers and powerful function, development and application of the analog signals of data acquisition and fast Fourier transform (FFT) algorithm processing program.Anyhow, this paper realized based on virtual instrument technology of virtual spectrum analyzer, not only on the function and the traditional spectrum analyzer can realize the same signal processing function, but also possesses friendly user interface, the humanized convenient, simple operation.