Evaluation of Emission from a PCB by Using Crosstalk between a Low Frequency Signal Trace and a Digital Signal Trace(Special Issue on Recent Progress in Electromagnetic Compatibility Technology)

概要

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In this paper, the evaluation of emission from a PCB by using crosstalk between a low frequency signal trace and a digital signal trace is investigated.These signal traces are closely routed in parallel to each other on the different several signal planes in the PCB.It is shown experimentally that the coupled signal trace with a cable section causes drastic increase of emission from the PCB.From the measurement results of current distribution on the cable section , it is shown that this current distribution contributes to the increase of emission from the PCB.Therefore, emission increasing by coupling between signal traces is evaluated by crosstalk between them.The measurement results of radiation and the calculation results of crosstalk on the PCB(deviation from results of the PCB which is referred, respectively)agree with each other within 2dB range or 3.5dB range.This result shows that reduction effect of emission from the PCB can be predicted by calculation results of crosstalk. Moreover, it is shown that evaluation of emission level by using crosstalk is useful to decide PCB's structure for reduction of emission from a high-density assemble PCB.From the viewpoint of practical application, it is effective for the reduction of emission from a PCB to separate a low frequency signal trace from a high-speed digital signal trace by ground plane of a PCB.
社団法人電子情報通信学会の論文
2000-03-25