基于FPGA的简易频谱分析仪

摘要

In the modem science research,it's very important to observe the frequency spectrum of signal and it's helpful for the student to comprehend the signal character directly and in-depth in the experiment class.A simple frequency spectrum analyzer uses C8051 single chip processor and FPGA,as well as high speed A/D converters.The system includes signal acquisition,linear signal frequency shift,digital filtering,FFT and LCD display. The experimental results show the system analyzes signals with the bandwidth from 0MHz to 5MHz and the minimum resolution up to 1 Hz.Besides,the chart of the signal frequency spectrum is well displayed on the LCD.The whole system works steadily and operates expediently and the system's cost is much lower than others.%观测信号频谱在科研中具有重大意义.在教学实验中也有利于学生更直观深入地了解信号特征.采用单片机C8051和FPGA.外加高速A/D转换器设计一种简易的频谱分析仪.该系统主要包括信号采集、频谱搬移、数字滤波、数字FFT和LCD显示.经测试.该系统能够分析信号带宽为0～5 MHz,最低分辨率达到1 Hz.而且信号频谱图能够很好地显示在LCD上.整个系统工作稳定,操作方便,且成本比其他频谱分析仪低很多.