简易数字信号传输性能分析仪实现  

Implement of Simple Signal Transmission Performance Analyzer

作　　者：赵林军[1] ZHAO Lin-jun （Department of E.I., Shaanxi University of Technology, Hanzhong 723003, China）

机构地区：[1]陕西理工学院电信工程系,陕西汉中723003

出　　处：《电脑知识与技术》2011年第11期7747-7748,共2页Computer Knowledge and Technology

摘　　要：论述了采用EP3C55F484C8N完成简易数字信号传输性能分析仪的方法。该仪器所使用的信源由周期为255的m序列及其曼彻斯特编码提供，经NE5532实现的截至频率可选的低通滤波器滤波与AD811实现放大后提供信道传输信号。由一个周期为4027的m序列模拟信道的加性噪声。低通滤波器的截至频率在100KHz、200KHz、500KHz内可选，放大器的增益在0．2～4内连续可调，噪声幅度在100mV～TTL电平内连续可调。接收端采用了CD4046数字锁相环完成位同步的提取，并输出含噪信号与位同步信号，用之在示波器上实现传输信号的眼图显示与参数测量。The implement of a simple digital signal transmission performance analyzer with EP3C55F484C8N is discussed. An m sequence and their Manchester code are used as the testing signal, and the use of NE5532 and AD811 to achieve three low-pass filters which cutoff frequencies of 100KHz, 200Khz and 500KHz and gain in 0.2 - 4 range adjustable. An analog channel additive noise produced by a cycle of 4027 m sequence, that its amplitude is adjustable continuously in 100mV-TTL level. At the same time, the receiver used CD4046 digital phase locked loop done bit synchronization extraction. The signal with noise and the bit synchronous signal are output to oscilloscope to display eye pattern.

关 键 词：FPGA 位同步 全数字锁相环 

分 类 号：TN391[电子电信—物理电子学]