基于FPGA的高精度模数转换器测试系统及方法研究

Research on High Precision Analog-to-Digital Converter Test System and Method Based on FPGA

针对高精度模数转换器的线性度测试时间慢的问题,提出一种能准确反映器件线性度、同时提高测试效率的线性度测试方法。设计基于FPGA数据采集板卡,采用即插即用的高精度数模转换器信号源板卡,结合数据采集分析软件,搭建高精度模数转换器测试系统,实现8通道24位高精度模数转换器的动态性能和线性度测试。相较于传统积木式仪器测试系统,新设计具有体积小、搭建方便、测试速度快等优点。经实验测试,在模拟输入为60 Hz条件下的SNR、SFDR、积分非线性范围和测试时间等指标均符合设计要求。

Aiming at the problem of slow linearity test time of high precision AD converter,a linearity test method is proposed,which can accurately reflect the linearity of the device and improve the test efficiency.The design is based on FPGA data acquisition card,using plug and play high precision DA converter signal source card,combined with data acquisition and analysis software,to build a high precision AD converter test system,and realize the dynamic performance and linearity test of 8-channel 24-bit high precision AD converter.Compared with the traditional building block instrument testing system,the new design has the advantages of small volume,convenient construction and fast testing speed.The experimental results show that SNR,SFDR,integral nonlinear range and test time meet the design requirements when the analog input is 60 Hz.