Ryuji Koga

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SUMMARY This paper explains a mechanism of common-mode generation on a printed circuit board with a narrow ground pattern. A transmission line has its value of degree of unbalance. At a connection point of two transmission lines having different degrees of unbalance, common mode voltage is generated proportional to the difference, and it drives common mode(More)
SUMMARY Placing a guard trace next to a signal line is the conventional technique for reducing the common-mode radiation from a printed circuit board. In this paper, the suppression of common-mode radiation from printed circuit boards having guard traces is estimated and evaluated using the imbalance difference model, which was proposed by the authors. To(More)
SUMMARY A guard trace placed near a signal line reduces common-mode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors , when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace,(More)
Abwa!a A fifth set of heavy ion single event effects (SEE) test data have been collected (including soft errors and Iatchup) for state-of-the-art parts are evaluated. Jnt oduct r ion Ongoing SEE test programs at JPL ,The Aerospace Corporation, the European Space Agency (ESA), CNES and other organizations are continuing to assess specific part performance(More)
SUMMARY We propose a novel technique of matching at both ends of the guard trace to suppress resonance. This approach is derived from the viewpoint that the guard trace acts as a transmission line. We examined that matched termination suppresses guard-trace resonance through simulating a circuit and measuring radiation. We found from these results that the(More)
Some recent results from research conducted in the EMC group at Okayama Universiry are reviewed A scheme for power-bus modeling with an analytical method is introduced. A linear macro-model for ICdLSIs. called the LECCS model, has been developed for EM and EMS simulation. This model has a very simple structure and is suficiently accurate. Combining the(More)