Patents by Inventor Hiroyuki Sakima
Hiroyuki Sakima 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: 7857505Abstract: A method and circuit for preventing an output signal, which has been corrected through digital correction or analog correction, from deviating from a target value and for preventing power supply noise and power consumption from increasing. A sensor amplification circuit receives output of a sensor as an input signal. Correction points are set at predetermined temperature intervals. The sensor amplification circuit performs digital correction for correcting the input signal with correction data set for each correction point. Further, the sensor amplification circuit performs a second correction for correcting the input signal between the correction points with gradient data calculated from the correction data for two of the correction points that are adjacent to each other.Type: GrantFiled: November 14, 2006Date of Patent: December 28, 2010Assignee: Fujitsu Semiconductor LimitedInventors: Hiroyuki Sakima, Koju Aoki, Takahiro Watai, Masaya Mizutani, Takuya Okajima
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Patent number: 7345536Abstract: An amplifier circuit which is connected to a sensor and variably sets an amplification property and a control method thereof are disclosed, the circuit having the capability of restricting the influence of change with time and temperature change. The amplifier circuit 1, which receives, as an input, a detection signal from the sensor and variably sets an amplification property, comprises: (1) a first reference value retaining unit 50 for retaining a first reference value K1 for setting an amplification property which makes an output signal be a specified detection reference output voltage when a reference input condition KJ is detected; (2) a correction signal generation unit 30 for generating a correction signal HS which reduces the difference between an amplification property actual measurement value and an amplification property set value; and (3) a first amplification property correction unit 40 for correcting the first reference value K1 based on the correction signal HS.Type: GrantFiled: July 15, 2005Date of Patent: March 18, 2008Assignee: Fujitsu LimitedInventors: Masaya Mizutani, Koju Aoki, Takahiro Watai, Koji Takekawa, Hiroyuki Sakima
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Publication number: 20080012718Abstract: An amplifier 1 is arranged to amplify a sense signal from a sensor with low current consumption while maintaining sufficient sensitivity. The amplifier 1 comprises a detection circuit 2 which detects a signal level of the sense signal and outputs an alarm signal when the sense signal is in a first signal level range R1, and a variable gain amplifier 3 which, based on a detection result of the detection circuit 2, stops an amplifying operation when the sense signal is in the first signal level range R1, performs the amplifying operation at a first gain G1 when the sense signal is in a second signal level range R2, or performs the amplifying operation at a second gain G2 larger than the first gain G1 when the sense signal is in a third signal level range R3 defined between the first and second signal level ranges.Type: ApplicationFiled: June 20, 2007Publication date: January 17, 2008Inventors: Kouju Aoki, Takahiro Watai, Hiroyuki Sakima, Masaya Mizutani, Takuya Okajima
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Publication number: 20070229120Abstract: A temperature characteristic correction method enabling easy setting of correction points, while reducing deviations of an output signal from a target value and preventing power supply noise and power consumption from increasing. The method includes storing correction patterns, each of which includes correction points set at a temperature interval that differs between the correction patterns. The method further includes storing correction data for each correction point in each correction pattern, selecting a correction pattern corresponding to the temperature dependent characteristic of the input signal from the correction patterns, and correcting the temperature dependent characteristic of the input signal with the selected correction pattern and the correction data corresponding to the selected correction pattern.Type: ApplicationFiled: August 29, 2006Publication date: October 4, 2007Inventors: Takuya Okajima, Koju Aoki, Takahiro Watai, Masaya Mizutani, Hiroyuki Sakima
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Publication number: 20070214884Abstract: A method and circuit for preventing an output signal, which has been corrected through digital correction or analog correction, from deviating from a target value and for preventing power supply noise and power consumption from increasing. A sensor amplification circuit receives output of a sensor as an input signal. Correction points are set at predetermined temperature intervals. The sensor amplification circuit performs digital correction for correcting the input signal with correction data set for each correction point. Further, the sensor amplification circuit performs a second correction for correcting the input signal between the correction points with gradient data calculated from the correction data for two of the correction points that are adjacent to each other.Type: ApplicationFiled: November 14, 2006Publication date: September 20, 2007Inventors: Hiroyuki Sakima, Koju Aoki, Takahiro Watai, Masaya Mizutani, Takuya Okajima
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Patent number: 7271595Abstract: Provided are two monitor circuits for monitoring two input signals of an input stage differential amplifier, respectively, and two monitor circuit for monitoring two output signals of the input stage differential amplifier, respectively. When failure occurs at the bridge circuit of a sensor element or at the input stage differential amplifier, the monitoring units or the monitoring units detect abnormality, which makes it possible to detect the failure of the sensor element or the input stage differential amplifier. Therefore it is possible to detect failure such as a disconnection or a short circuit of the bridge circuit of the sensor element and failure which has occurred at the amplifier for amplifying outputs of the sensor element.Type: GrantFiled: February 27, 2006Date of Patent: September 18, 2007Assignee: Fujitsu LimitedInventors: Katsuya Shimizu, Hiroyuki Sakima, Takahiro Watai, Masaya Mizutani, Koju Aoki, Koji Takekawa
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Publication number: 20070115005Abstract: Provided are two monitor circuits for monitoring two input signals of an input stage differential amplifier, respectively, and two monitor circuit for monitoring two output signals of the input stage differential amplifier, respectively. When failure occurs at the bridge circuit of a sensor element or at the input stage differential amplifier, the monitoring units or the monitoring units detect abnormality, which makes it possible to detect the failure of the sensor element or the input stage differential amplifier. Therefore it is possible to detect failure such as a disconnection or a short circuit of the bridge circuit of the sensor element and failure which has occurred at the amplifier for amplifying outputs of the sensor element.Type: ApplicationFiled: February 27, 2006Publication date: May 24, 2007Inventors: Katsuya Shimizu, Hiroyuki Sakima, Takahiro Watai, Masaya Mizutani, Koju Aoki, Koji Takekawa
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Publication number: 20060208795Abstract: An amplifier circuit which is connected to a sensor and variably sets an amplification property and a control method thereof are disclosed, the circuit having the capability of restricting the influence of change with time and temperature change. The amplifier circuit 1, which receives, as an input, a detection signal from the sensor and variably sets an amplification property, comprises: (1) a first reference value retaining unit 50 for retaining a first reference value K1 for setting an amplification property which makes an output signal be a specified detection reference output voltage when a reference input condition KJ is detected; (2) a correction signal generation unit 30 for generating a correction signal HS which reduces the difference between an amplification property actual measurement value and an amplification property set value; and (3) a first amplification property correction unit 40 for correcting the first reference value K1 based on the correction signal HS.Type: ApplicationFiled: July 15, 2005Publication date: September 21, 2006Inventors: Masaya Mizutani, Koju Aoki, Takahiro Watai, Koji Takekawa, Hiroyuki Sakima
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Patent number: 7064645Abstract: The present invention realizes a miniaturized electronic device that is still capable of maintaining its high reliability even when miniaturized. To this end, the electronic device has an electronic circuit, comprising: a substrate with a circuit formation surface on which one part of the electronic circuit is formed; a polyimide layer that is formed on the circuit formation surface; and a spiral inductor constituting another part of the electronic circuit, which is formed into a pattern on the polyimide layer.Type: GrantFiled: December 13, 2002Date of Patent: June 20, 2006Assignee: Fujitsu LimitedInventors: Kazuhiko Kobayashi, Hideharu Sakoda, Hirohisa Matsuki, Osamu Igawa, Mitsutaka Sato, Koju Aoki, Hiroyuki Sakima
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Patent number: 6864729Abstract: A method of switching the mode of a PLL circuit which has a high-speed mode and a normal mode, which allows the PLL circuit to be locked up at a high speed. The PLL circuit includes a phase comparator and a charge pump for generating a current depending on a comparison output signal from the phase comparator. The mode switching method includes the steps of detecting whether a current output terminal of the charge pump is in a high impedance state, and switching the mode of the PLL circuit from the high-speed mode to the normal mode or from the normal mode to the high-speed mode when the high impedance state is detected.Type: GrantFiled: March 1, 2002Date of Patent: March 8, 2005Assignee: Fujitsu LimitedInventors: Koju Aoki, Hiroyuki Sakima
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Publication number: 20030127704Abstract: The present invention realizes a miniaturized electronic device that is still capable of maintaining its high reliability even when miniaturized. To this end, the electronic device has an electronic circuit, comprising: a substrate with a circuit formation surface on which one part of the electronic circuit is formed; a polyimide layer that is formed on the circuit formation surface; and a spiral inductor constituting another part of the electronic circuit, which is formed into a pattern on the polyimide layer.Type: ApplicationFiled: December 13, 2002Publication date: July 10, 2003Inventors: Kazuhiko Kobayashi, Hideharu Sakoda, Hirohisa Matsuki, Osamu Igawa, Mitsutaka Sato, Koju Aoki, Hiroyuki Sakima
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Publication number: 20020140470Abstract: A method of switching the mode of a PLL circuit which has a high-speed mode and a normal mode, which allows the PLL circuit to be locked up at a high speed. The PLL circuit includes a phase comparator and a charge pump for generating a current depending on a comparison output signal from the phase comparator. The mode switching method includes the steps of detecting whether a current output terminal of the charge pump is in a high impedance state, and switching the mode of the PLL circuit from the high-speed mode to the normal mode or from the normal mode to the high-speed mode when the high impedance state is detected.Type: ApplicationFiled: March 1, 2002Publication date: October 3, 2002Applicant: FUJITSU LIMITEDInventors: Koju Aoki, Hiroyuki Sakima