Patents by Inventor Takehiko Umeyama
Takehiko Umeyama 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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Publication number: 20160134159Abstract: A semiconductor integrated circuit included a power supply circuit having a first input terminal, a second input terminal, and an output terminal, wherein the power supply circuit includes a measurement circuit and a switch circuit, wherein the measurement circuit compares a first voltage supplied to the first input terminal with a second voltage supplied to the second input terminal, outputs a determination signal as the comparing result and operates on the first voltage, wherein the switch circuit selects the first input terminal or the second input terminal and couples the selected terminal with the output terminal in response to the determination signal, wherein a main power supply voltage from a main power supply can be supplied to the first input terminal, and wherein an auxiliary power supply voltage from an auxiliary power supply can be supplied to the second input terminal.Type: ApplicationFiled: January 13, 2016Publication date: May 12, 2016Inventor: Takehiko Umeyama
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Patent number: 9252750Abstract: The present invention is made to not only reduce voltage drop when a power supply circuit makes a selection between a power supply voltage from a main power supply and a backup power supply voltage from an auxiliary power supply, but also reduce the power consumption of the auxiliary power supply. The power supply circuit, which is in a semiconductor integrated circuit, includes a measurement circuit, a switch control circuit, and a switch circuit. The switch circuit includes a first switch element and a second switch element. The first switch element is coupled between an output terminal and a first input terminal. The second switch element is coupled between the output terminal and a second input terminal. The measurement circuit operates on the main power supply voltage at the first input terminal and compares the main power supply voltage with the auxiliary power supply voltage.Type: GrantFiled: April 17, 2014Date of Patent: February 2, 2016Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Takehiko Umeyama
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Publication number: 20140346878Abstract: The present invention is made to not only reduce voltage drop when a power supply circuit makes a selection between a power supply voltage from a main power supply and a backup power supply voltage from an auxiliary power supply, but also reduce the power consumption of the auxiliary power supply. The power supply circuit, which is in a semiconductor integrated circuit, includes a measurement circuit, a switch control circuit, and a switch circuit. The switch circuit includes a first switch element and a second switch element. The first switch element is coupled between an output terminal and a first input terminal. The second switch element is coupled between the output terminal and a second input terminal. The measurement circuit operates on the main power supply voltage at the first input terminal and compares the main power supply voltage with the auxiliary power supply voltage.Type: ApplicationFiled: April 17, 2014Publication date: November 27, 2014Applicant: Renesas Electronics CorporationInventor: Takehiko Umeyama
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Patent number: 8786162Abstract: The disclosed invention provides a device for driving a piezoelectric element, making it possible to make an output voltage follow a control voltage during a discharging action. A charging circuit charges a piezo element through a first node. A discharging circuit discharges electric charge charged in the piezo element through the first node. A control circuit makes switching to cause the discharging circuit to perform a discharging action or cause the charging circuit to perform a charging action, based on a comparison between the magnitude of a voltage being applied to the piezo element and the magnitude of a control voltage.Type: GrantFiled: February 17, 2012Date of Patent: July 22, 2014Assignee: Renesas Electronics CorporationInventors: Shingo Tajima, Shoji Tsuchioka, Takehiko Umeyama
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Patent number: 8344654Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: GrantFiled: December 13, 2011Date of Patent: January 1, 2013Assignee: Renesas Electronics CorporationInventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Publication number: 20120212099Abstract: The disclosed invention provides a device for driving a piezoelectric element, making it possible to make an output voltage follow a control voltage during a discharging action. A charging circuit charges a piezo element through a first node. A discharging circuit discharges electric charge charged in the piezo element through the first node. A control circuit makes switching to cause the discharging circuit to perform a discharging action or cause the charging circuit to perform a charging action, based on a comparison between the magnitude of a voltage being applied to the piezo element and the magnitude of a control voltage.Type: ApplicationFiled: February 17, 2012Publication date: August 23, 2012Inventors: Shingo TAJIMA, Shoji Tsuchioka, Takehiko Umeyama
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Publication number: 20120081021Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: ApplicationFiled: December 13, 2011Publication date: April 5, 2012Applicant: Renesas Electonics CorporationInventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 8098023Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: GrantFiled: July 30, 2010Date of Patent: January 17, 2012Assignee: Renesas Electronics CorporationInventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 8064300Abstract: In order to cancel an offset caused by a variation of a signal inputted from an optical pickup, variations of elements in an integrated circuit, etc., a calibration circuit which generates and feeds back an offset adjustment amount that makes the offset zero by a comparison with a reference value, and an offset adjustment circuit that makes the offset zero using the fed-back control signal are provided in an analog front-end LSI. The offset adjustment by the calibration circuit is automatically done in response to commands supplied from a digital signal processing LSI, a host control device, etc. On the other hand, as for a signal on which arithmetic processing such as gain control, addition and subtraction, is performed, the offset adjustment is performed by sending the offset adjustment amount obtained by an arithmetic operation performed by software processing of the digital signal processing LSI to the analog front-end.Type: GrantFiled: August 25, 2005Date of Patent: November 22, 2011Assignee: Renesas Electronics CorporationInventors: Hiroshi Abe, Takehiko Umeyama
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Publication number: 20100295461Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: ApplicationFiled: July 30, 2010Publication date: November 25, 2010Applicant: Renesas Technology Corp.Inventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 7791288Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: GrantFiled: February 7, 2008Date of Patent: September 7, 2010Assignee: Renesas Technology Corp.Inventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 7643261Abstract: There is provided a semiconductor device capable of supplying an analog input signal higher than or equal to an operating power supply voltage. An electrostatic discharge protection circuit corresponding to the analog input signal is provided for an external terminal that is supplied with an analog input signal generated with a first power supply voltage. A voltage divider resistor divides the analog input signal passing through the electrostatic discharge protection circuit into a voltage corresponding to a second power supply voltage lower that the first power supply voltage. An input circuit operating on the second power supply voltage receives the analog input signal divided by the voltage divider resistor to form an internal analog signal. There are provided first and second unidirectional elements. The first unidirectional element passes current from the input circuit's input terminal to the second power supply voltage.Type: GrantFiled: December 27, 2006Date of Patent: January 5, 2010Assignee: Renesas Technology Corp.Inventors: Hiroshi Ide, Satoshi Fujita, Takehiko Umeyama
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Publication number: 20090147633Abstract: In order to cancel an offset caused by a variation of a signal inputted from an optical pickup, variations of elements in an integrated circuit, etc., a calibration circuit which generates and feeds back an offset adjustment amount that makes the offset zero by a comparison with a reference value, and an offset adjustment circuit that makes the offset zero using the fed-back control signal are provided in an analog front-end LSI. The offset adjustment by the calibration circuit is automatically done in response to commands supplied from a digital signal processing LSI, a host control device, etc. On the other hand, as for a signal on which arithmetic processing such as gain control, addition and subtraction, is performed, the offset adjustment is performed by sending the offset adjustment amount obtained by an arithmetic operation performed by software processing of the digital signal processing LSI to the analog front-end.Type: ApplicationFiled: August 25, 2005Publication date: June 11, 2009Inventors: Hiroshi Abe, Takehiko Umeyama
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Publication number: 20080272708Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: ApplicationFiled: February 7, 2008Publication date: November 6, 2008Applicant: Renesas Technology Corp.Inventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 7372882Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: GrantFiled: April 27, 2005Date of Patent: May 13, 2008Assignee: Renesas Technology Corp.Inventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Publication number: 20070177328Abstract: There is provided a semiconductor device capable of supplying an analog input signal higher than or equal to an operating power supply voltage. An electrostatic discharge protection circuit corresponding to the analog input signal is provided for an external terminal that is supplied with an analog input signal generated with a first power supply voltage. A voltage divider resistor divides the analog input signal passing through the electrostatic discharge protection circuit into a voltage corresponding to a second power supply voltage lower that the first power supply voltage. An input circuit operating on the second power supply voltage receives the analog input signal divided by the voltage divider resistor to form an internal analog signal. There are provided first and second unidirectional elements. The first unidirectional element passes current from the input circuit's input terminal to the second power supply voltage.Type: ApplicationFiled: December 27, 2006Publication date: August 2, 2007Inventors: Hiroshi IDE, Satoshi Fujita, Takehiko Umeyama
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Patent number: 7187513Abstract: Magneto-resistive (MR) head pre-amplifiers for single polarity power supply applications are presented. An exemplary pre-amplifier includes a bias network coupled to first and second input terminals of the pre-amplifier, the input terminals for receiving signals corresponding to variations in magnetic fields from an MR head. At least one gain stage having first and second input terminals and first and second output terminals for amplifying the received signals is included. A pair of coupling capacitors, each capacitor being connected between a respective input terminal of the pre-amplifier and a corresponding respective input terminal of the at least one gain stage, are further included in the pre-amplifier design. Finally, the exemplary pre-amplifier includes a pair of feedback capacitors, each capacitor being connected between respective input and output terminals of the at least one gain stage. The pre-amplifier is powered by a single polarity power supply.Type: GrantFiled: June 14, 2002Date of Patent: March 6, 2007Assignee: Renesas Technology America, Inc.Inventors: Takehiko Umeyama, Robert B. Ross, Masashige Tada
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Patent number: 6998733Abstract: An N-transistor switches a current of a first constant current source by a positive input pulse to generate an output pulse current where an overshoot and an undershoot appear. A P-transistor switches a current of a second constant current source by a negative correction pulse applied at timing of occurrence of the overshoot to generate a correction pulse current. Another N-transistor switches a current of a third constant current source by a positive correction pulse applied at timing of occurrence of the undershoot to generate a correction pulse current. These correction pulse currents are added to the output pulse current to obtain a current as a wavelength where the overshoot and undershoot are largely reduced.Type: GrantFiled: October 8, 2002Date of Patent: February 14, 2006Assignee: Renesas Technology Corp.Inventors: Taiji Kabayama, Motokuni Saeki, Takehiko Umeyama
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Publication number: 20050243879Abstract: A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).Type: ApplicationFiled: April 27, 2005Publication date: November 3, 2005Applicant: Renesas Technology Corp.Inventors: Tsuyoshi Horiuchi, Takehiko Umeyama
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Patent number: 6783274Abstract: A device for measuring temperature of a semiconductor integrated circuit includes first and second current mirror circuits, an N channel transistor connected to an output terminal of the second cur rent mirror circuit, an npn transistor connected to an output terminal of the first current mirror circuit and the N channel transistor, and an operational transistor connected to a node between the second current circuit and the N channel transistor. Currents that flow from the second current mirror circuit to the N channel transistor and from the N channel transistor to the npn transistor have different temperature coefficients. The operational amplifier corrects the difference in the temperature coefficients of these currents to output a voltage of ground electric potential standard.Type: GrantFiled: March 20, 2003Date of Patent: August 31, 2004Assignee: Renesas Technology Corp.Inventors: Takehiko Umeyama, Kazuyuki Ohmi