The Experts below are selected from a list of 29952 Experts worldwide ranked by ideXlab platform
N. Morita - One of the best experts on this subject based on the ideXlab platform.
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Influence of Surface Roughness on Contact Voltage Drop of Electrical Sliding Contacts
Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts, 2007Co-Authors: T. Ueno, Kenichi Kadono, N. MoritaAbstract:Usually, sliding contact action is used to supply current to a rotating or a moving object. In the present experiment, we examined the relation between surface roughness condition and contact Voltage Drop for sliding contacts. We used carbon brush and copper slip ring for sliding materials. It is confirmed that the contact Voltage Drop is changed by various surface roughness of sliding materials. In case of the brush surface roughness is same as slip ring surface roughness, the contact Voltage Drop is increased. We consider that the real contact area affects the contact Voltage Drop change. In this paper, we examined mainly, the relation between sliding speed and surface roughness for electrical sliding contact action.
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Influence of surface roughness on contact Voltage Drop of sliding contacts
Proceedings of the Fifty-First IEEE Holm Conference on Electrical Contacts 2005., 2005Co-Authors: T. Ueno, N. MoritaAbstract:Usually, sliding contact action is used to supply current to a rotating or a moving object. In the present experiment, we examined the relation between surface roughness condition and contact Voltage Drop for sliding contacts. We used carbon brush and copper slip ring for sliding materials. It is confirmed that the contact Voltage Drop tends to decrease for large roughness surface condition of sliding materials. However, in case of the brush surface roughness is same to slip ring surface roughness, the contact Voltage Drop is increased. The present work has demonstrated that the relation between surface roughness condition and contact Voltage Drop for electrical sliding contact action.
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Influence of surface roughness on Voltage Drop of sliding contacts under various gases environment
Proceedings of the Forty-Ninth IEEE Holm Conference on Electrical Contacts 2003., 2003Co-Authors: T. Ueno, N. Morita, K. SawaAbstract:Sliding contact behavior is important in the mechanism of collecting current and is operated under various atmospheric conditions such as vacuum, low-temperature, low-oxygen environment and so on. In the present experiment, we examined the relation between sliding contacts phenomena and ambient atmosphere conditions. It is confirmed that the contact Voltage Drop tends to increase in atmospheric pressure conditions comparison with a low-pressure environment. From these results, it is estimated that the physically adsorbed gases on the sliding surface and surface roughness conditions affects the contact Voltage Drop rise. In this paper, the relation between sliding surface roughness and atmosphere gases variation for sliding contacts is examined. As a result, it becomes clear that the contact Voltage Drop changed for various surface roughness conditions in vacuum and inert gases environments. However, in the oxygen including environment, it is difficult to determine experimentally that the surface roughness affects the contact Voltage Drop. Therefore, the effect of ambient gas (oxygen and argon gas) on contact Voltage Drop is discussed.
M Harada - One of the best experts on this subject based on the ideXlab platform.
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a design concept for the low forward Voltage Drop 4500 v trench igbt
International Symposium on Power Semiconductor Devices and IC's, 1998Co-Authors: Tetsuya Nitta, Akihiro Uenishi, Tadaharu Minato, Shigeo Kusunoki, Sachiko Aono, K. Nakamura, T. Takahashi, H. Nakamura, M HaradaAbstract:A design concept for a new trench IGBT structure for low forward Voltage Drop is described. The low forward Voltage Drop can be achieved by minimizing the p-base region to increase the hole density of the n-base near the emitter side, and by simultaneously keeping MOS channel resistance low. For 4500 V devices, the "triplet" type structure (one p-base every three trenches) is the optimum one, and it improves the forward Voltage Drop by about 10% over the conventional structure.
Junichi Mano - One of the best experts on this subject based on the ideXlab platform.
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CICC - A Time-Slicing Ring Oscillator for Capturing Instantaneous Delay Degradation and Power Supply Voltage Drop
IEEE Custom Integrated Circuits Conference 2006, 2006Co-Authors: Takashi Sato, Yu Matsumoto, Koji Hirakimoto, Michio Komoda, Junichi ManoAbstract:A time-slicing ring oscillator (TSRO) which captures dynamic delay degradation due to instantaneous Voltage Drop on a power supply network is proposed. Voltage Drop impact on delay is directly measured and time-domain effective Voltage Drop waveforms is also obtained. The TSRO consists of standard logic cells only hence fits almost anywhere in logic circuits for in-situ measurements. Measurement results of a test chip using 90-nm process successfully proved its concept.
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A Time-Slicing Ring Oscillator for Capturing Instantaneous Delay Degradation and Power Supply Voltage Drop
IEEE Custom Integrated Circuits Conference 2006, 2006Co-Authors: Takashi Sato, Yu Matsumoto, Koji Hirakimoto, Michio Komoda, Junichi ManoAbstract:A time-slicing ring oscillator (TSRO) which captures dynamic delay degradation due to instantaneous Voltage Drop on a power supply network is proposed. Voltage Drop impact on delay is directly measured and time-domain effective Voltage Drop waveforms is also obtained. The TSRO consists of standard logic cells only hence fits almost anywhere in logic circuits for in-situ measurements. Measurement results of a test chip using 90-nm process successfully proved its concept
T. Ueno - One of the best experts on this subject based on the ideXlab platform.
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Influence of Surface Roughness on Contact Voltage Drop of Electrical Sliding Contacts
Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts, 2007Co-Authors: T. Ueno, Kenichi Kadono, N. MoritaAbstract:Usually, sliding contact action is used to supply current to a rotating or a moving object. In the present experiment, we examined the relation between surface roughness condition and contact Voltage Drop for sliding contacts. We used carbon brush and copper slip ring for sliding materials. It is confirmed that the contact Voltage Drop is changed by various surface roughness of sliding materials. In case of the brush surface roughness is same as slip ring surface roughness, the contact Voltage Drop is increased. We consider that the real contact area affects the contact Voltage Drop change. In this paper, we examined mainly, the relation between sliding speed and surface roughness for electrical sliding contact action.
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Influence of surface roughness on contact Voltage Drop of sliding contacts
Proceedings of the Fifty-First IEEE Holm Conference on Electrical Contacts 2005., 2005Co-Authors: T. Ueno, N. MoritaAbstract:Usually, sliding contact action is used to supply current to a rotating or a moving object. In the present experiment, we examined the relation between surface roughness condition and contact Voltage Drop for sliding contacts. We used carbon brush and copper slip ring for sliding materials. It is confirmed that the contact Voltage Drop tends to decrease for large roughness surface condition of sliding materials. However, in case of the brush surface roughness is same to slip ring surface roughness, the contact Voltage Drop is increased. The present work has demonstrated that the relation between surface roughness condition and contact Voltage Drop for electrical sliding contact action.
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Influence of surface roughness on Voltage Drop of sliding contacts under various gases environment
Proceedings of the Forty-Ninth IEEE Holm Conference on Electrical Contacts 2003., 2003Co-Authors: T. Ueno, N. Morita, K. SawaAbstract:Sliding contact behavior is important in the mechanism of collecting current and is operated under various atmospheric conditions such as vacuum, low-temperature, low-oxygen environment and so on. In the present experiment, we examined the relation between sliding contacts phenomena and ambient atmosphere conditions. It is confirmed that the contact Voltage Drop tends to increase in atmospheric pressure conditions comparison with a low-pressure environment. From these results, it is estimated that the physically adsorbed gases on the sliding surface and surface roughness conditions affects the contact Voltage Drop rise. In this paper, the relation between sliding surface roughness and atmosphere gases variation for sliding contacts is examined. As a result, it becomes clear that the contact Voltage Drop changed for various surface roughness conditions in vacuum and inert gases environments. However, in the oxygen including environment, it is difficult to determine experimentally that the surface roughness affects the contact Voltage Drop. Therefore, the effect of ambient gas (oxygen and argon gas) on contact Voltage Drop is discussed.
Jian Wang - One of the best experts on this subject based on the ideXlab platform.
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CAD/Graphics - Voltage Drop Aware Power Pad Assignment and Floorplanning for Multi-Voltage SoC Designs
2013 International Conference on Computer-Aided Design and Computer Graphics, 2013Co-Authors: Lunyao Wang, Jian WangAbstract:Multi-Voltage technique is an effective way of power saving in system-on-a-chip (SoC) designs. However, as the technology nodes continue to shrink, the Voltage Drop constraint in multiple power domains presents serious obstacles in power/ground (P/G) network design of wire-bonding package. In this paper, a Voltage Drop aware power pad assignment and floor planning method for multi-Voltage SoC designs is proposed. In order to reduce the Voltage Drop, we develop a fast method to calculate the location of power pad for each power domain based on the spring model. During floor planning iterations, a static Voltage Drop analysis is performed to update the Voltage Drop distribution, and then number of violation nodes in the P/G network is obtained. To speed up the floor planning algorithm, instead of time-consuming matrix computation to obtain Voltage Drops, we use the weighted distance from blocks to power pads as an optimization objective. Experimental results on GSRC benchmark suites indicate that the proposed approach generates an optimized placement of power pads and floor planning of blocks.
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Voltage Drop Aware Power Pad Assignment and Floorplanning for Multi-Voltage SoC Designs
2013 International Conference on Computer-Aided Design and Computer Graphics, 2013Co-Authors: Lunyao Wang, Jian WangAbstract:Multi-Voltage technique is an effective way of power saving in system-on-a-chip (SoC) designs. However, as the technology nodes continue to shrink, the Voltage Drop constraint in multiple power domains presents serious obstacles in power/ground (P/G) network design of wire-bonding package. In this paper, a Voltage Drop aware power pad assignment and floor planning method for multi-Voltage SoC designs is proposed. In order to reduce the Voltage Drop, we develop a fast method to calculate the location of power pad for each power domain based on the spring model. During floor planning iterations, a static Voltage Drop analysis is performed to update the Voltage Drop distribution, and then number of violation nodes in the P/G network is obtained. To speed up the floor planning algorithm, instead of time-consuming matrix computation to obtain Voltage Drops, we use the weighted distance from blocks to power pads as an optimization objective. Experimental results on GSRC benchmark suites indicate that the proposed approach generates an optimized placement of power pads and floor planning of blocks.