Patents by Inventor Masakatsu Yokota
Masakatsu Yokota has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10505645Abstract: To discriminate between a circuit where a failure does not occur and a circuit where a failure might occur, a wireless communication device has tested units which belong to a transmission side circuit, tested units which belong to a reception side circuit, a test signal generation unit for generating a test signal, a test signal reception unit for receiving a test signal, a test signal determination unit for determining whether or not the test signal received by the test signal reception unit is normal, and test signal transfer units for transferring a test signal from the transmission side circuit to the reception side circuit.Type: GrantFiled: April 17, 2018Date of Patent: December 10, 2019Assignee: Renesas Electronics CorporationInventors: Suguru Fujita, Masakatsu Yokota, Daisuke Oshida
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Publication number: 20180343070Abstract: To discriminate between a circuit where a failure does not occur and a circuit where a failure might occur, a wireless communication device has tested units which belong to a transmission side circuit, tested units which belong to a reception side circuit, a test signal generation unit for generating a test signal, a test signal reception unit for receiving a test signal, a test signal determination unit for determining whether or not the test signal received by the test signal reception unit is normal, and test signal transfer units for transferring a test signal from the transmission side circuit to the reception side circuit.Type: ApplicationFiled: April 17, 2018Publication date: November 29, 2018Inventors: Suguru FUJITA, Masakatsu YOKOTA, Daisuke OSHIDA
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Publication number: 20170092126Abstract: There is provided a communication system including the first communication device (roadside unit), a second communication device, and a data processing device. The first communication device is capable of establishing broadcast-type first communication (V2X communication) with the first communication terminal (vehicle). The second communication device is capable of establishing unicast- or multicast-type second communication with a plurality of moving objects (pedestrians) other than the first communication terminal and acquiring position information about the moving objects (pedestrians). The data processing device permits the second communication device to acquire position information about the moving objects and allows the first communication device (roadside unit) to transmit information (LDM) representative of the acquired position information about the moving objects to the first communication terminal (vehicle).Type: ApplicationFiled: September 21, 2016Publication date: March 30, 2017Inventors: Daisuke OSHIDA, Masakatsu YOKOTA, Yasuhiro SAGESAKA
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Patent number: 7689191Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: GrantFiled: March 30, 2007Date of Patent: March 30, 2010Assignees: Renesas Technology Corp., Epoch Microelectronics, Inc.Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Publication number: 20070273415Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: ApplicationFiled: April 4, 2007Publication date: November 29, 2007Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Publication number: 20070188203Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: ApplicationFiled: March 30, 2007Publication date: August 16, 2007Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Patent number: 7212047Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: GrantFiled: October 4, 2005Date of Patent: May 1, 2007Assignees: Renesas Technology Corp., Epoch Microelectronics, Inc.Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Patent number: 7015735Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: GrantFiled: December 19, 2003Date of Patent: March 21, 2006Assignees: Renesas Technology Corp., Epoch Microelectronics, Inc.Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Publication number: 20060028255Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: ApplicationFiled: October 4, 2005Publication date: February 9, 2006Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Patent number: 6946095Abstract: The invention provides an internal filter with an improved filtering ability of removing particularly fine inclusion particles from molten aluminum or molten aluminum alloy. The internal filter includes an aggregate meshed member made of a refractory material and a coating layer formed on a surface of the aggregate meshed member. The coating layer contains a soda silicate that is able to be softened or viscous at a temperature of the molten aluminum alloy.Type: GrantFiled: June 8, 2001Date of Patent: September 20, 2005Assignees: Kabushiki Kaisha Kobe Seiko Sho, Showa Denko K.K., Sky Aluminium Co., Ltd., Sumitomo Light Metal Industries, Ltd., Nippon Light Metal Company, Ltd., The Furukawa Electric Co., Ltd., Mitsubishi Aluminum Co., Ltd.Inventors: Masakatsu Yokota, Kenji Osumi, Yutaka Nagakura
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Publication number: 20050136847Abstract: A communication semiconductor integrated circuit (high frequency IC) that has a function of differentially-singly converts and outputs a transmitted signal suppressing deterioration of a harmonic suppression characteristic and enables miniaturization and an electronic component (high frequency module) that mounts the communication semiconductor integrated circuit are provided. In the communication semiconductor integrated circuit (high frequency IC) having a limiter that amplifies a modulated and up-converted transmitted signal and supplies a power amplifier with the signal, an unbalanced reduction means having, for example, differential MOS transistors is provided in collectors or drains of differential transistors that construct the limiter to output pins and continue to apply a current to the output pins and reduces the impedance of the transistor on an off side even when one of the transistors enters an off state in accordance with an input signal in parallel to the transistor.Type: ApplicationFiled: December 15, 2004Publication date: June 23, 2005Inventors: Hiroaki Matsui, Taizo Yamawaki, Masahiro Ito, Masakatsu Yokota
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Publication number: 20050134391Abstract: A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits has current sources which generate current values smaller than those generated by current sources of the other charge pump circuit. The loop filter has a first capacitive element connected to a charge/discharge node, and a second capacitive element connected to the charge/discharge node through a resistive element. The first capacitive element is charged and discharged by the one charge pump circuit, while the second capacitive element is charged and discharged by the other charge pump circuit. A charging current source of the one charge pump circuit operates simultaneously with a discharging current source of the other charge pump circuit, i.e., the charge pump circuits operate in opposite phase.Type: ApplicationFiled: December 19, 2003Publication date: June 23, 2005Inventors: Yasuyuki Kimura, Satoshi Shimizu, Masakatsu Yokota, Ken Suyama, Aleksander Dec
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Publication number: 20040245685Abstract: The invention provides an internal filter with an improved filtering ability of removing particularly fine inclusion particles from molten aluminum or molten aluminum alloy. The internal filter includes an aggregate meshed member made of a refractory material and a coating layer formed on a surface of the aggregate meshed member. The coating layer contains a soda silicate that is able to be softened or viscous at a temperature of the molten aluminum alloy.Type: ApplicationFiled: June 8, 2001Publication date: December 9, 2004Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO, SHOWA DENKO K.K., SKY ALUMINIUM CO., LTD., SUMITOMO LIGHT METAL INDUSTRIES, LTD., NIPPON LIGHT METAL COMPANY, LTD., THE FURUKAWA ELECTRIC CO., LTD., MITSUBISHI ALUMINUM CO., LTD.Inventors: Masakatsu Yokota, Kenji Osumi, Yutaka Nagakura