低电压差分信号长线传输的优化设计  

Optimal design of long-line transmission with low voltage differential signal

作　　者：陈晓敏 薛志超[2] 张志龙 文丰[1] 袁小康 Chen Xiaomin;Xue Zhichao;Zhang Zhilong;Weng Feng;Yuan Xiaokang(National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan 030051,China;Key Laboratory of Space Physics,China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051 [2]中国运载火箭技术研究院空间物理重点实验室,北京100076

出　　处：《电子技术应用》2020年第11期104-108,共5页Application of Electronic Technique

摘　　要：针对影响信号完整性的噪声与衰减进行分析与验证,硬件物理层采取预加重与均衡处理技术、同时进行阻抗匹配优化并设计双重电气隔离,提升信号传输质量。软件链路层进行两级乒乓形式缓存设计以优化传输效率;改进基于CRC校验的反馈重传机制,保证系统实现数据检错重传功能,能适应更多链路异常情况。经验证,优化后在传输长度为100 m时系统可满足180 Mb/s的高可靠传输,满足工程应用技术要求。The noise and attenuation that affect the signal integrity are analyzed and verified.The hardware physical layer adopts pre-emphasis and equalization processing technology.The impedance matching optimization and double electrical isolation are designed to improve the signal transmission quality.At the software link layer,a two-level ping-pong buffer is designed to optimize transmission efficiency.The feedback retransmission mechanism based on cyclic redundancy check is improved to ensure that the system realizes the function of data error detection and retransmission,and can adapt to more abnormal link conditions.It has been verified that when the optimized transmission length is 100 m,the system can achieve a high reliable transmission of 180 Mb/s,which meets the technical requirements of engineering applications.

关 键 词：低电压差分信号 信号完整性 预加重 乒乓操作 反馈重传机制 

分 类 号：TN914[电子电信—通信与信息系统]