一种基于FPGA的简易数字信号传输性能分析仪的设计

摘要

This paper introduces the design of a simple digital signal transm ission perform ance analyzer base on FPGA ,which can be used forthe testofdigitalsignaltransm ission perform ance.Two msequences designed in the analyzerbase on FPG A logic elements,w hich produces digitalsignaland pseudo random signalrespectively, what is more, the Manchester coding output is realized.The channel is simulated by a low-pass filter and the pseudo signalgenerator,the synchronization clock signalis extracted through the Phase-Locked Loop built-in FP-G A .NIOS IIprocessorbuilt-in FPG Aused for the mastercontroller of the analyzer,which interface isfriendly.Fi-nally the signals are accessed into oscilloscope before the eye chart can beobserved,which transm ission perfor-mance estimate can berealized.%本文介绍了一种基于FPG A 的简易数字信号传输性能分析仪的设计，实现数字信号传输性能测试。利用FPG A 逻辑功能设计两个m 序列发生器，生成数字信号和伪随机信号，并用曼彻斯特码编码输出。设计一个低通滤波器，和伪随机信号发生器一起用来模拟传输信道，并利用FPG A 内置的数字锁相环提取同步时钟信号。分析仪采用FPGA 的NIOS II处理器作为主控，交互接口友好。最后信号和同步信号通过示波器后，就可以观察到眼图，从而实现数字信号传输性能的评价。