研究者詳細 - 豊田　啓孝

MISC - 豊田　啓孝

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Reduction of Common-mode Radiation by Terminating Guard Trace with Resistors

Tetsushi Watanabe, Tohlu Matsushima, Yoshitaka Toyota, Ryuji Koga, Osami Wada

Proceedings of 2009 Internatinal Symposium on Electromagnetic Compatibility (EMC'09/Kyoto) 97 - 100 2009年

Examination of Power-Ground Resonance for IBIS Model with Non-Ideal Power Supply

Norimasa Oka, Kengo Iokibe, Yoshitaka Toyota, Ryuji Koga

Proceedings of 2009 Internatinal Symposium on Electromagnetic Compatibility (EMC'09/Kyoto) 583 - 586 2009年

Calculation of Common-Mode Radiation from Differential Signaling System Using Imbalance Difference Model

Tohlu Matsushima, Keisuke Fukumasu, Tetsushi Watanabe, Yoshitaka Toyota, Kengo Iokibe, Ryuji Koga, Osami Wada

Proceedings of 2009 Korea-Japan Joint Conference on AP/EMC/EMT (KJJC-AP/EMC/EMT 2009) 187 - 190 2009年

Band Elimination Characteristics of EBG Structure Containing High Permeability Ferrite Thin Films

Koichi Kondo, Shigeyoshi Yoshida, Hiroshi Ono, Yoshitaka Toyota

Proceedings of VIII International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology (EMC'2009) 151 - 153 2009年

Combination of IBIS and LECCS-core Models for SI Analysis under Non-Ideal Power Supply Conditions

Norimasa Oka, Kengo Iokibe, Yoshitaka Toyota, Ryuji Koga

Proceedings of 2009 Korea-Japan Joint Conference on AP/EMC/EMT (KJJC-AP/EMC/EMT 2009) 159 - 162 2009年

Calculation of Common-Mode Radiation from Differential Signaling System Using Imbalance Difference Model

Tohlu Matsushima, Keisuke Fukumasu, Tetsushi Watanabe, Yoshitaka Toyota, Kengo Iokibe, Ryuji Koga, Osami Wada

Proceedings of 2009 Korea-Japan Joint Conference on AP/EMC/EMT (KJJC-AP/EMC/EMT 2009) 187 - 190 2009年

Reduction of EMI from Differential Signaling System Using Asymmetric Guard Trace

Tohlu Matsushima, Tetsushi Watanabe, Yoshitaka Toyota, Kengo Iokibe, Ryuji Koga, Osami Wada

Proceedings of International Conference on Electronics Packaging 2009 (ICEP2009) 718 - 723 2009年

配線パターンを変化させた基板による多電源ピン LECCS-core モデルの評価

東亮太, 五百旗頭健吾, 津田剛宏, 市川浩司, 中村克己, 豊田啓孝, 古賀隆治

電子情報通信学会技術研究報告. EMCJ, 環境電磁工学 108 ( 132 ) 43 - 48 2008年7月

記述言語：日本語出版者・発行元：一般社団法人電子情報通信学会

我々の研究グループではIC/LSIの電源系を流れる高周波電流をシミュレーションするため,EMCマクロモデルである多電源ピンLECCS-coreモデルを提案している.このECCS-coreモデルはIC/LSIの電源系を流れるCMOSトランジスタのスイッチングに伴い発生する高周波電流を線形等価回路と内部電流源で表現する.本報告では,DUTを複数の電源端子を有するマイクロコントローラとし,モデル構築基板とは配線パターンの異なる別の基板を用い,LECCS-coreモデルによる電源端子電流シミュレーションと実測を比較した.その結果,平均誤差4dB以内で実測と一致した.さらにバイパスキャパシタを外した場合において,電源配線が合流する箇所でも精度良く電源端子電流がシミュレーションできることを示した.

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コモンモードアンテナモデルによるコネクタ接続されたプリント回路基板からの放射電磁波予測(その2) : インダクタンスの考慮によるコネクタ部モデルの改良

若槻友里, 鳥越誠, 渡辺哲史, 豊田啓孝, 五百旗頭健吾, 古賀隆治

電子情報通信学会技術研究報告. EMCJ, 環境電磁工学 108 ( 132 ) 37 - 42 2008年7月

記述言語：日本語出版者・発行元：一般社団法人電子情報通信学会

本報告では,コネクタを介して接続されているプリント回路基板(PCB)に対して,コネクタ部の持つインダクタンスを考慮したコモンモードアンテナモデルを提案する.コモンモードアンテナモデルは,PCBからのコモンモード放射を高速かつ少ない計算コストで計算できる.前報では,コネクタ接続PCBにおいてもコネクタのピン配置による放射量の変化を計算することができることを示した.しかし実測で見られた放射スペクトルの周波数シフトは再現できなかったので,ピーク付近の精度は十分とは言えなかった.この原因をコネクタ部の実効インダクタンス変化と考え,本報告ではこれを考慮することでモデル改良を行った.その結果,このインダクタンスを考慮した改良モデルでは放射の周波数シフトが表現でき,実測結果と比較したところピーク付近での精度は誤差2dB程度まで改善した.

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B-4-37 平衡度不整合理論で定義されるコモンモード励振源の実験的検証(B-4. 環境電磁工学,一般セッション)

松嶋徹, 渡辺哲史, 豊田啓孝, 五百旗頭健吾, 古賀隆治, 和田修己

電子情報通信学会総合大会講演論文集 2008 ( 1 ) 346 - 346 2008年3月

Suppressing power bus resonance and radiation using and EBG structure

Yoshitaka Toyota, Kengo Iokibe, Ryuji Koga, Koichi Kondo, Shigeyoshi Yoshida

2008 ASIA-PACIFIC SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY AND 19TH INTERNATIONAL ZURICH SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1 AND 2 566 - + 2008年

記述言語：英語出版者・発行元：IEEE

We investigated the effects of noise suppression by interposing magnetic materials between the power and ground planes of a printed circuit board and focused on RF transmission through and radiation from the power bus. To reduce power bus resonance and radiation, we used a commercial noise suppression sheet, which is commonly used to suppress RF noise generated from electronic devices. We also examined a thin Ni-Zn ferrite film for practical use in the future. We found that power bus resonance and radiation could be mitigated owing to the imaginary part of complex permeability of magnetic materials. The thin ferrite film with a planar electromagnetic bandgap (EBG) structure helped suppress transmission and radiation in the EBG passband.

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Modeling of Microcontroller with Multiple Power Supply Pins for Conducted EMI Simulations

Kengo Iokibe, Ryota Higashi, Takahiro Tsuda, Kouji Ichikawa, Katsumi Nakamura, Yoshitaka Toyota, Ryuji Koga

IEEE EDAPS: 2008 ELECTRICAL DESIGN OF ADVANCED PACKAGING AND SYSTEMS SYMPOSIUM 135 - + 2008年

記述言語：英語出版者・発行元：IEEE

An EMC macro-model of a 16-bit microcontroller with multiple-power-supply pins has been proposed for estimating the conducted EMI from a power-supply network. The macro-model, called the linear equivalent circuit and current sources (LECCS) model, is composed of multiple circuit blocks and multiple current sources corresponding to the composition of the chip circuits in the microcontroller, i.e., a current source for a circuit block. A current source statistically expresses the total RF current occurring in the corresponding circuit block. We confirmed that the proposed model could correctly estimate the RF power-supply currents under different decoupling conditions up to 300 MHz. We also found that a linear circuit of the regulator between the I/O and core circuit blocks could express the RF coupling between the two blocks.

DOI： 10.1109/EDAPS.2008.4736018

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Determination of Grounding Location for Guard Trace to Reduce Common-Mode Radiation

Tohlu Matsushima, Tetsushi Watanabe, Kengo Iokibe, Yoshitaka Toyota, Ryuji Koga, Osami Wada

Proceedjngs of International Conference on Electronics Packaging 2008 (ICEP 2008) 124 - 129 2008年

Prediction of the Common-mode Radiated Emission from the Board to Board Interconnection through Common-mode Antenna Model

Makoto Torigoe, Akifumi Sadatoshi, Yoshitaka Toyota, Kengo Iokibe, Ruji Koga, Tetsushi Watanabe, Osami Wada

2008 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1-3 498 - + 2008年

記述言語：英語出版者・発行元：IEEE

In this paper, the common-mode antenna model, which can estimate the amount of common-mode radiation quickly and accurately, was applied to a board-to-board interconnection structure with a connector. The inductor model is introduced as the connector model for improving accuracy of the common-mode antenna model. By using the inductance, which was calculated with the commercial electromagnetic field simulator, the radiated emissions estimated by the model agreed with the measurement results within an error of 3 dB around the peak emission levels.

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EMC Macro-modeling of CMOS Inverter Using LECCS-I/O Model with Additional Current Source

Kengo Iokibe, Akihiro Ohsaki, Yoshitaka Toyota, Ryuji Koga, Osami Wada

2008 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1-3 554 - + 2008年

記述言語：英語出版者・発行元：IEEE

The authors investigated an EMC macro-model of the CMOS logic inverter gate, named LECCS-I/O that consists of linear equivalent circuit and current sources. This paper modifies the macro-model by adding another current source to express the short-circuit current in the inverter. The macro-model was determined from SPICE calculations of impedance and power current by using a device model of an inverter IC. The modified model was tested with several load capacitances in SPICE simulation. The results showed that the macro-model predicts the power current with good accuracy in the range up to 3 GHz except for frequencies at which inductances of the package and of traces on printed circuit board and capacitance of the load caused resonances.

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Macro Model of Driver Circuits for EMI Simulation

Norimasa Oka, Kengo Iokibe, Yoshitaka Toyota, Ryuji Koga

Proceedjngs of International Conference on Electronics Packaging 2008 (ICEP 2008) 467 - 472 2008年

Experimental Validation of Imbalance Difference Model to Estimate Common-Mode Excitation in PCBs

Yoshitaka Toyota, Tohlu Matsushima, Kengo Iokibe, Ryuji Koga, Tetsushi Watanabe

2008 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1-3 578 - + 2008年

記述言語：英語出版者・発行元：IEEE

We have proposed a common-mode antenna model that is designed specifically for estimating common-mode radiation from printed circuit boards (PCBs) very quickly. The model is composed of an antenna that has the same geometry as the adjacent ground plane of the PCB and an excitation source based on an imbalance difference model. The excitation source is provided by the product of Delta h and V-N, where Delta h is the difference in current division factors related to the cross-sectional structure of the transmission line, and VN is the voltage between the signal line and return plane of the transmission line. Here, we describe an experimental validation of the common-mode excitation carried out by measuring the reduction in radiation due to a guard trace placed close to a signal line with a narrow return plane. As a result, it was found that the total common-mode excitation can be given by a superposition of two excitation sources. The results also suggest that when designing the PCB, the guard trace should be grounded at the interface between different ground-plane widths to suppress noise.

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EMI simulation based on cavity-mode model for power-bus radiation calculation of power/ground planes with IC/LSI

Yoshitaka Toyota, Masahiro Nishida, Kengo Iokibe, Ryuji Koga, Osami Wada

2008 ASIA-PACIFIC SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY AND 19TH INTERNATIONAL ZURICH SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY, VOLS 1 AND 2 423 - + 2008年

記述言語：英語出版者・発行元：IEEE

This paper describes an electromagnetic interference (EMI) simulation of radiated emissions caused by simultaneous switching noise in an irregular power/ground plane structure. For quick simulation of the radiated emissions from the power-bus edges, we used a series of analytical approaches: power-bus resonance characterization by a fast algorithm based on a cavity-mode model and a segmentation method and radiation calculation using equivalent magnetic current based on the field equivalent principle. The analytically based radiation calculation is achieved within a few minutes on a single personal computer and agrees with the actual measurements. Furthermore, this paper demonstrates an EMI simulation with and without decoupling capacitors by using a linear macro model of an integrated circuit as a noise source. We found a fair agreement between the simulation and measured results.

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CMOSインバータの2電流源EMCマクロモデル構築

五百旗頭健吾, 大崎瑛弘, 豊田啓孝, 古賀隆治, 和田修己

信学総大, March, 2008 334 334 - 334 2008年

PCBの電源層間への高透磁率シート挿入による層間共振と放射の抑制

豊田啓孝, 五百旗頭健吾, 古賀隆治, 近藤幸一, 吉田栄吉

電子情報通信学会総合大会, 2008 339 - 339 2008年

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