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信号沿传输路径发射时,理想情况下,信号均不应被反射回信号源,即所有信号能量均应抵达预期目标位置。如果整条传输路径和线路终端的阻抗与信号源输出阻抗相当,则会出现上述情况。但是,如果阻抗出现变化,则部分事件信号可能会反射。
时域反射计(TDR)是一款用于测量被测元器件阻抗剖面的测量工具。使用阶跃发生器和示波器,可向被测器件发送快速脉冲边缘。如果阻抗中断,部分脉冲将返回到监控示波器。通过监控反射信号抵达示波器的时间(以及被测器件内脉冲传播速率)可确定中断位置。此外,可通过对比反射脉冲与被测器件所接收的原始脉冲的大小,确定中断幅值。因此,这一“回波技术”可轻松确定线路内阻抗是否发生变化。使用分析技术,可揭示线路内中断现象的本质(电阻式、电感式或电容式),并确认传输系统内的衰减是由串联损耗还是由分流损耗引发。示波器显示屏上将即时显示上述信息。与其他反射计方法仅在固定频率范围内进行测试不同,由于快速脉冲阶跃激励属宽带激励,因此,TDR测试可提供与传输系统宽带相应相关的重要信息。
高性能通讯系统需要具备优质的电信号传输路径。为获取高效信号流和出色的信号完整性,传输路径阻抗应尽可能保持理想恒定值。时域反射计TDR测试是一项成熟的技术,可用于验证元件、互连与传输线路的阻抗和信号路径质量。
随着数据速率增长和元件几何结构的简化,基础 TDR测试系统的精确性和分辨率可能受到一定限制。本应用指南说明测量系统的极限和测量误差来源,还介绍可提升精确性的实用技术和有效方法。
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