Patents by Inventor Hiroki Ishikuro
Hiroki Ishikuro 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: 9864143Abstract: The invention relates to a directional coupling-type multi-drop bus of which the impedance is matched with the bus at the time of coupling so that the speed is increased. A directional coupler is formed when a second module provided with a second coupler end is mounted on a first module provided with a first coupler end, and as a result, the coupling impedance where the proximity effects in the coupling state of the directional coupler are reflected is matched with the impedance of the bus.Type: GrantFiled: August 15, 2014Date of Patent: January 9, 2018Assignee: KEIO UNIVERSITYInventors: Tadahiro Kuroda, Hiroki Ishikuro
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Patent number: 9419684Abstract: The invention relates to an inter-module communication apparatus where the reflection is reduced so that the communication channel can provide high speed and broadband as compared to inductive coupling. When modules having a signal line terminated with a terminating member and a feedback signal line are layered on top of each other so that the signal lines are coupled to each other and the return signal lines are coupled to each other using capacitive coupling and inductive coupling, the impedance of the terminating members is a coupling impedance that reflects the proximity effects in the coupling state between the modules.Type: GrantFiled: February 14, 2012Date of Patent: August 16, 2016Assignee: KEIO UNIVERSITYInventors: Tadahiro Kuroda, Hiroki Ishikuro
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Publication number: 20150054349Abstract: Wirelessly supplying power is rapidly changed by a switching circuit 11 selectively exciting a magnetic field coupling resonance circuit of L1 and C1 for wireless power supply by use of a resonant frequency of the resonance circuit and its ?-divided frequency. A large power is supplied in the case of excitation at the resonant frequency, and in the case of excitation at the ?-divided frequency, a small power is supplied. A wireless power supply device with a high power conversion efficiency, with less unwanted radiation, and capable of rapidly changing supplying power can thereby be provided.Type: ApplicationFiled: February 4, 2013Publication date: February 26, 2015Inventors: Hiroki Ishikuro, Tadahiro Kuroda, Masao Taguchi
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Publication number: 20140355935Abstract: The invention relates to a directional coupling-type multi-drop bus of which the impedance is matched with the bus at the time of coupling so that the speed is increased. A directional coupler is formed when a second module provided with a second coupler end is mounted on a first module provided with a first coupler end, and as a result, the coupling impedance where the proximity effects in the coupling state of the directional coupler are reflected is matched with the impedance of the bus.Type: ApplicationFiled: August 15, 2014Publication date: December 4, 2014Applicant: KEIO UNIVERSITYInventors: Tadahiro Kuroda, Hiroki Ishikuro
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Publication number: 20130324044Abstract: The invention relates to an inter-module communication apparatus where the reflection is reduced so that the communication channel can provide high speed and broadband as compared to inductive coupling. When modules having a signal line terminated with a terminating member and a feedback signal line are layered on top of each other so that the signal lines are coupled to each other and the return signal lines are coupled to each other using capacitive coupling and inductive coupling, the impedance of the terminating members is a coupling impedance that reflects the proximity effects in the coupling state between the modules.Type: ApplicationFiled: February 14, 2012Publication date: December 5, 2013Applicant: KEIO UNIVERSITYInventors: Tadahiro Kuroda, Hiroki Ishikuro
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Patent number: 8423850Abstract: A pulse transmission technique is used for wireless communication between a microcomputer (13) having a debugging support circuit (17) and a debugger (13). The pulse transmission technique is based on magnetic field coupling between a first coil (14) provided for the microcomputer and a second coil (8) coupled with the debugger. During an initialization operation, the microcomputer performs a process of configuring a communication condition of the wireless communication to perform the wireless communication. The microcomputer awaits control from the debugger when the microcomputer establishes communication with the debugger. The debugger awaits establishment of the communication and proceeds to control of the microcomputer in accordance with the wireless communication. It is possible to provide contactless interface for system debugging without the need for a large antenna or a large-scale circuit for modulation and demodulation.Type: GrantFiled: November 8, 2007Date of Patent: April 16, 2013Assignees: Renesas Electronics Corporation, Keio UniversityInventors: Shunichi Iwata, Yoichi Takahata, Toshihiko Sugahara, Yutaka Takikawa, Yoshihiro Shimizu, Hiroki Ishikuro, Tadahiro Kuroda
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Publication number: 20100040123Abstract: A pulse transmission technique is used for wireless communication between a microcomputer (13) having a debugging support circuit (17) and a debugger (13). The pulse transmission technique is based on magnetic field coupling between a first coil (14) provided for the microcomputer and a second coil (8) coupled with the debugger. During an initialization operation, the microcomputer performs a process of configuring a communication condition of the wireless communication to perform the wireless communication. The microcomputer awaits control from the debugger when the microcomputer establishes communication with the debugger. The debugger awaits establishment of the communication and proceeds to control of the microcomputer in accordance with the wireless communication. It is possible to provide contactless interface for system debugging without the need for a large antenna or a large-scale circuit for modulation and demodulation.Type: ApplicationFiled: November 8, 2007Publication date: February 18, 2010Inventors: Shunichi Iwata, Yoichi Takahata, Toshihiko Sugahara, Yutaka Takikawa, Yoshihiro Shimizu, Hiroki Ishikuro, Tadahiro Kuroda
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Patent number: 7327201Abstract: A semiconductor integrated circuit device having a voltage controlled oscillation circuit that is capable of sufficient oscillation performance and a wireless communication device having the semiconductor integrated circuit device are disclosed. A difference between the maximum value and the minimum value of the oscillation output signal is automatically controlled to be substantially equal to the first predetermined voltage which is the threshold voltage of the oscillation MOSFET for sufficient phase noise performance. It is further disclosed that the difference between the maximum value and the minimum value of the oscillation output signal may be varied by the change of the threshold voltage of the MOSFET caused by substrate bias effect, while maintaining the sufficient phase noise performance.Type: GrantFiled: December 15, 2005Date of Patent: February 5, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Daisuke Miyashita, Hiroki Ishikuro
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Publication number: 20060152295Abstract: A semiconductor integrated circuit device having a voltage controlled oscillation circuit that is capable of sufficient oscillation performance and a wireless communication device having the semiconductor integrated circuit device are disclosed. A difference between the maximum value and the minimum value of the oscillation output signal is automatically controlled to be substantially equal to the first predetermined voltage which is the threshold voltage of the oscillation MOSFET for sufficient phase noise performance. It is further disclosed that the difference between the maximum value and the minimum value of the oscillation output signal may be varied by the change of the threshold voltage of the MOSFET caused by substrate bias effect, while maintaining the sufficient phase noise performance.Type: ApplicationFiled: December 15, 2005Publication date: July 13, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Daisuke Miyashita, Hiroki Ishikuro
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Patent number: 6859648Abstract: A semiconductor integrated circuit device includes a first phase shifter configured to make a phase difference of 90 degrees between local signals, first and second mixer circuits configured to mix the local signals with a received signal, a second phase shifter configured to make a phase difference of 90 degrees between output signals of the first and second mixer circuits to output first and second output signals, an adder configured to add the first and second output signals, a subtracter configured to subtract the first and second output signals, a signal intensity detector configured to compare between an intensity of an output signal of the subtracter with a reference level intensity, and a power supply control circuit configured to disable either of the first and second mixer circuits or either of the first and second mixer circuits and the first phase shifter according to a comparison result.Type: GrantFiled: May 10, 2002Date of Patent: February 22, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Mototsugu Hamada, Hiroki Ishikuro
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Publication number: 20030194983Abstract: A semiconductor integrated circuit device includes a first phase shifter configured to make a phase difference of 90 degrees between local signals, first and second mixer circuits configured to mix the local signals with a received signal, a second phase shifter configured to make a phase difference of 90 degrees between output signals of the first and second mixer circuits to output first and second output signals, an adder configured to add the first and second output signals, a subtracter configured to subtract the first and second output signals, a signal intensity detector configured to compare between an intensity of an output signal of the subtracter with a reference level intensity, and a power supply control circuit configured to disable either of the first and second mixer circuits or either of the first and second mixer circuits and the first phase shifter according to a comparison result.Type: ApplicationFiled: May 10, 2002Publication date: October 16, 2003Inventors: Mototsugu Hamada, Hiroki Ishikuro