双同轴电缆差分传输方式对干扰的抑制作用

发布时间：2018-12-24 12:28

【摘要】：传输线对信号的无失真传输是超宽带测量系统准确获得待测波形和量值的前提之一。基于带宽、功率容量、损耗、屏蔽性能、尺寸等诸多因素,在超宽带测量系统中经常选用同轴电缆作为传输线。指出采用单根同轴电缆传输信号时会引入干扰,分析了干扰形成的原因,通过数值模拟确认了干扰的存在和危害;提出采用两根共地同轴电缆共同传输信号并进行差分处理,可以有效消除传输线引入的干扰,分析了干扰消除的过程和原理,将原数值模拟模型中的单同轴电缆替换为双同轴电缆进行仿真计算,对比验证了双同轴电缆差分传输方式对干扰的有效抑制作用;对双同轴电缆差分传输结构进行了实验测试,结果表明,单根同轴电缆会引入较大的干扰信号,通过两根同轴电缆的共地连接、差分处理,可以有效消除干扰,达到高保真传输要求。
[Abstract]:The distortion-free transmission of the signal is one of the prerequisites for the UWB measurement system to accurately obtain the waveform and the value of the signal to be measured. Coaxial cable is often used as transmission line in UWB measurement system based on bandwidth, power capacity, loss, shielding performance, size and so on. It is pointed out that the interference will be introduced when the signal is transmitted by a single coaxial cable, the reason of the interference is analyzed, and the existence and harm of the interference are confirmed by numerical simulation. It is put forward that using two coaxial cables to transmit signals together and to carry out differential processing can effectively eliminate the interference introduced by transmission lines. The process and principle of interference elimination are analyzed. The single coaxial cable in the original numerical simulation model is replaced with the double coaxial cable and the simulation results show that the differential transmission mode of the double coaxial cable can restrain the interference effectively. The experimental results of differential transmission structure of double coaxial cable show that a single coaxial cable can introduce large interference signals, and the interference can be effectively eliminated by coconnection and differential processing of two coaxial cables. Achieve high fidelity transmission requirements.
【作者单位】：西北核技术研究所;
【基金】：国家高技术发展计划项目
【分类号】：TN913.32

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