基于FPGA的频谱分析仪的设计与研制

Design and study of spectrum analyzer based on FPGA

设计了一种新型的基于FPGA的频谱分析仪。该分析仪采用FFT技术,充分利用NiosⅡ软核处理器,加上LCD、AD芯片、滤波器及一些外围电路,完成了信号的采集、滤波、处理、数字FFT,并最终将得到的数据送到LCD上显示。系统的测试结果表明,该数字频谱分析仪能满足0～1MHz频段范围内实时频谱分析应用的需要。该频谱分析仪工作稳定、操作方便、且成本比其他频谱分析仪低很多。

This paper designs a new FPGA-based spectrum analyzer. The analyzer uses FFT technology and takes full advantage of Nios II soft-core processor to complete signal acquisition, filtering, signal processing, digital FFT, and eventually displays the data on the LCD with the help of LCD, AD chips, filters and some peripheral circuits. The System testing result shows that the digital spectrum analyzer can meet the demands of the real-time spectral analysis with the frequency scope of 0- 1 MHz well. The whole system works steadily and operates expediently and the cost is also much lower than the others.