Index for Radiation from Signal Line Driven by Digital IC

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  • Miyazaki Chiharu
    Information Technology R&D Center, Mitsubishi Electric Corporation
  • Sasaki Yuichi
    Information Technology R&D Center, Mitsubishi Electric Corporation
  • Oka Naoto
    Information Technology R&D Center, Mitsubishi Electric Corporation
  • Tokuda Masamitsu
    Department of Electronic and Communication Engineering, Musashi Institute of Technology

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  • ディジタル信号線からの放射エミッションを示す指標
  • ディジタル シンゴウセン カラ ノ ホウシャ エミッション オ シメス シヒョウ

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Abstract

The index for normal-mode radiations from a signal line was studied. Even if some digital IC have a same function, the radiation from a signal line changes with kinds and manufacturers of digital IC. In order to calculate this difference of the normal mode radiations, the output model of digital IC was consisted of a voltage source and an output resistor. The output resistance is calculated from output voltages of digital IC and an input impedance of a signal line in order to consider the switching characteristics of digital IC. The calculated values of the normal-mode radiations by using the output model of digital IC agreed very well with the measurement results. And the authors proposed the ratio of an open-circuit output voltage and an output resistance of digital IC as the index for the normal-mode radiation from a signal line. This ratio is valid as the index, because the normal-mode radiation is closely correlative with this index. And it was confirmed that the maximum value of the normal-mode radiation was able to be calculated by using this index.

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