基于FPGA和NIOSⅡ的频谱分析仪的设计

Design and Research of Spectroanalyzer Based on NIOSⅡ

随着微电子技术的飞速发展,基于数字信号处理的频谱分析已经应用到各个领域并且发挥着重要作用。文章提出了一种频谱分析仪设计方案,该方案基于FFT技术,采用NIOSⅡ软核作为CPU,以FPGA,LCD,DDS芯片和AD芯片以及一些外围电路组成系统,完成信号采集,数据分析,FFT变换,对连续性周期和非周期信号的频谱分析,然后直接在LCD上显示信号的频谱特性曲线。

With the development of micro-electronics technology,the analysis of frequency spectrum based on digital signal processing has applied to every fields and taken an important role.The article advances an design solution that is based on FFT processing and uses NIOS II softcore as CPU,and the hardware system is composed of FPGA chip,LCD chip,DDS chip,AD chip and other peripheral circuit.The system can samples signals,analyzes data,takes FFT transform to the analysis of frequency spectrum of discontinuous and continuous periodic signals and shows the results on LCD.