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首页> 外文会议>42nd international symposium on microelectronics (IMAPS 2009) >Production Measurement of Frequency Dependent Attenuation and Phase Constant of PCB Traces
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Production Measurement of Frequency Dependent Attenuation and Phase Constant of PCB Traces

机译：PCB走线的频率相关衰减和相位常数的生产测量

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摘要

As clock rates have increased and pulse widths have narrowed, signal loss at the higher frequencies has become arnkey problem for both designers and board fabricators. Current techniques for measuring signal loss duringrnproduction testing of PCBs cannot directly provide the specific attenuation and phase shift for the trace beingrnmeasured. A new measurement technique using short pulses has demonstrated in the laboratory that thernpropagation constant of a trace can be determined accurately and presented as attenuation and phase per unitrnlength as functions of frequency to beyond 20 GHz. This Short Pulse Propagation measurement process has beenrnevaluated as mature enough to transfer from a laboratory environment and become part of a mainstream productionrnmeasurement system. The technique uses available sampling oscilloscopes, step generators, and hardwarerndifferentiators to obtain the high-frequency pulse needed for Time Domain Transmission (TDT) measurements.rnSince a production application of the Short Pulse Propagation process uses available equipment and provenrnmeasurement and mathematical techniques, it can provide an accurate and efficient tool for test, evaluation, andrnprocess control. The propagation constant that is obtained from the Short Pulse Propagation measurements alsornprovides the foundational data for additional measurements and modeling to obtain the broadband dielectricrnconstant and loss tangent on product-level, multi-layer PCB wiring.
机译：随着时钟速率的增加和脉冲宽度的变窄，对于设计人员和电路板制造商而言，较高频率下的信号损失已成为一个关键问题。当前用于测量PCB生产测试期间信号损失的技术无法直接为被测走线提供特定的衰减和相移。在实验室中，一种使用短脉冲的新测量技术已经证明，可以精确确定轨迹的传播常数，并将其表示为超过20 GHz的频率的函数，即衰减和每单位长度的相位。该短脉冲传播测量过程已被重新评估为足够成熟，可以从实验室环境转移并成为主流生产测量系统的一部分。该技术使用可用的采样示波器，步进发生器和硬件微分器来获取时域传输（TDT）测量所需的高频脉冲。由于短脉冲传播过程的生产应用使用了可用的设备以及经过验证的测量和数学技术，因此可以为测试，评估和过程控制提供准确而有效的工具。从短脉冲传播测量中获得的传播常数也为进一步的测量和建模提供了基础数据，以在产品级多层PCB布线上获得宽带介电常数和损耗角正切值。

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