Patents by Inventor Hisahiro Ito
Hisahiro Ito 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: 20240030871Abstract: A circuit unit includes a first terminal functioning as a power supply terminal or a voltage input terminal, to which a first voltage is applied, a second terminal to which a second voltage is applied, an oscillation circuit oscillating a vibrator, a first switch electrically coupling or decoupling the first terminal and the oscillation circuit, a second switch electrically coupling or decoupling the second terminal and the oscillation circuit, and a selection circuit controlling the first switch and the second switch based on the first voltage and supplying one of the first voltage and the second voltage as a power supply voltage to the oscillation circuit.Type: ApplicationFiled: July 19, 2023Publication date: January 25, 2024Inventors: Hisahiro ITO, Saneyuki IMAMURA, Akio TSUTSUMI
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Patent number: 11863157Abstract: There is provided a vibrator device including: a vibrator element; a semiconductor substrate having a first surface on which the vibrator element is disposed and a second surface positioned on an opposite side of the first surface; a fractional N-PLL circuit disposed at the second surface; a wiring that is disposed at the first surface and electrically couples the vibrator element and the fractional N-PLL circuit; and an output terminal that is disposed at the second surface side of the semiconductor substrate, is electrically coupled to the fractional N-PLL circuit, and outputs a signal from the fractional N-PLL circuit, in which the output terminal does not overlap the wiring in a plan view along a thickness direction of the semiconductor substrate.Type: GrantFiled: February 25, 2021Date of Patent: January 2, 2024Assignee: SEIKO EPSON CORPORATIONInventors: Junichi Takeuchi, Hisahiro Ito
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Patent number: 11563437Abstract: An integrated circuit apparatus includes an oscillation circuit that generates an oscillation signal by using a resonator, an output buffer circuit that outputs a clock signal based on the oscillation signal, a DC voltage generation circuit that generates a DC voltage used to generate the oscillation signal or the clock signal, a power source pad to which a power source voltage is supplied, a ground pad to which a ground voltage is supplied, and a clock pad via which the clock signal is outputted. The ground pad and the DC voltage generation circuit are disposed so as to overlap with each other in the plan view.Type: GrantFiled: January 21, 2022Date of Patent: January 24, 2023Assignee: SEIKO EPSON CORPORATIONInventors: Hisahiro Ito, Shoichiro Kasahara
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Patent number: 11431343Abstract: In the oscillator, a quartz crystal resonator and an oscillation circuit formed in an IC incorporating an inductor are electrically coupled to each other with a resonator interconnection disposed on a surface of a substrate to form an oscillation loop. A conductor layer disposed as an intermediate layer of the substrate is disposed so as to overlap the resonator interconnection and not to overlap the inductor incorporated in the IC in a plan view.Type: GrantFiled: May 28, 2021Date of Patent: August 30, 2022Inventors: Shoichiro Kasahara, Hisahiro Ito, Shinya Aoki
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Publication number: 20220239299Abstract: An integrated circuit apparatus includes an oscillation circuit that generates an oscillation signal by using a resonator, an output buffer circuit that outputs a clock signal based on the oscillation signal, a DC voltage generation circuit that generates a DC voltage used to generate the oscillation signal or the clock signal, a power source pad to which a power source voltage is supplied, a ground pad to which a ground voltage is supplied, and a clock pad via which the clock signal is outputted. The ground pad and the DC voltage generation circuit are disposed so as to overlap with each other in the plan view.Type: ApplicationFiled: January 21, 2022Publication date: July 28, 2022Inventors: Hisahiro Ito, Shoichiro Kasahara
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Patent number: 11397446Abstract: A circuit device is used in an electronic device including a receiver, a control circuit that performs processing on reception data received by the receiver using a clock signal, a transmitter that transmits transmission data generated by performing processing based on the reception data by the control circuit. The circuit device includes a time-to-digital conversion circuit that measures a time difference between a transition timing of a start signal based on the reception data and a transition timing of a stop signal based on the transmission data or the clock signal, and an output interface that outputs, to the control circuit, a measurement result of the time difference of the time-to-digital conversion circuit.Type: GrantFiled: December 18, 2020Date of Patent: July 26, 2022Inventors: Hisahiro Ito, Hideo Haneda, Yasuhiro Sudo, Akio Tsutsumi
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Publication number: 20220004220Abstract: A circuit device is used in an electronic device including a receiver, a control circuit that performs processing on reception data received by the receiver using a clock signal, a transmitter that transmits transmission data generated by performing processing based on the reception data by the control circuit. The circuit device includes a time-to-digital conversion circuit that measures a time difference between a transition timing of a start signal based on the reception data and a transition timing of a stop signal based on the transmission data or the clock signal, and an output interface that outputs, to the control circuit, a measurement result of the time difference of the time-to-digital conversion circuit.Type: ApplicationFiled: December 18, 2020Publication date: January 6, 2022Inventors: Hisahiro ITO, Hideo HANEDA, Yasuhiro SUDO, Akio TSUTSUMI
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Patent number: 11196427Abstract: There is configured a charge pump circuit for outputting a phase difference current to a first node, the charge pump circuit including a first current source coupled between a high potential power supply node and the first node, a second current source coupled between a low potential power supply node and the first node, a first switch coupled between the first current source and the first node, a second switch coupled between the second current source and the first node, a third switch coupled between the first current source and a second node, a fourth switch coupled between the second current source and the second node, a third current source for supplying a negative offset current to the first node, and a push-type differential amplifier circuit an input side of which is coupled to the first node, and an output side of which is coupled to the second node.Type: GrantFiled: February 26, 2021Date of Patent: December 7, 2021Inventors: Akio Tsutsumi, Ryo Ichikawa, Hisahiro Ito, Yasunari Furuya
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Publication number: 20210376840Abstract: In the oscillator, a quartz crystal resonator and an oscillation circuit formed in an IC incorporating an inductor are electrically coupled to each other with a resonator interconnection disposed on a surface of a substrate to form an oscillation loop. A conductor layer disposed as an intermediate layer of the substrate is disposed so as to overlap the resonator interconnection and not to overlap the inductor incorporated in the IC in a plan view.Type: ApplicationFiled: May 28, 2021Publication date: December 2, 2021Inventors: Shoichiro KASAHARA, Hisahiro ITO, Shinya AOKI
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Patent number: 11165433Abstract: A charge pump includes: a switch circuit that switches a current source conducted to an output node based on a signal from a phase frequency detector included in a PLL circuit; a first current source that is the current source provided between a high potential node and the switch circuit, and supplies a current to the output node by a first conduction-type depletion mode MOS transistor forming a self-bias circuit; and a second current source that is the current source provided between a low potential node and the switch circuit, and draws the current from the output node by the first conduction-type depletion mode MOS transistor forming the self-bias circuit.Type: GrantFiled: December 10, 2020Date of Patent: November 2, 2021Inventors: Ryo Ichikawa, Hisahiro Ito
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Publication number: 20210273643Abstract: There is configured a charge pump circuit for outputting a phase difference current to a first node, the charge pump circuit including a first current source coupled between a high potential power supply node and the first node, a second current source coupled between a low potential power supply node and the first node, a first switch coupled between the first current source and the first node, a second switch coupled between the second current source and the first node, a third switch coupled between the first current source and a second node, a fourth switch coupled between the second current source and the second node, a third current source for supplying a negative offset current to the first node, and a push-type differential amplifier circuit an input side of which is coupled to the first node, and an output side of which is coupled to the second node.Type: ApplicationFiled: February 26, 2021Publication date: September 2, 2021Inventors: Akio TSUTSUMI, Ryo ICHIKAWA, Hisahiro ITO, Yasunari FURUYA
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Publication number: 20210273628Abstract: There is provided a vibrator device including: a vibrator element; a semiconductor substrate having a first surface on which the vibrator element is disposed and a second surface positioned on an opposite side of the first surface; a fractional N-PLL circuit disposed at the second surface; a wiring that is disposed at the first surface and electrically couples the vibrator element and the fractional N-PLL circuit; and an output terminal that is disposed at the second surface side of the semiconductor substrate, is electrically coupled to the fractional N-PLL circuit, and outputs a signal from the fractional N-PLL circuit, in which the output terminal does not overlap the wiring in a plan view along a thickness direction of the semiconductor substrate.Type: ApplicationFiled: February 25, 2021Publication date: September 2, 2021Inventors: Junichi Takeuchi, Hisahiro Ito
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Oscillation circuit, oscillator, communication device, and method of controlling oscillation circuit
Patent number: 11043954Abstract: An oscillation circuit includes a first oscillation circuit configured to oscillate a resonator to generate a first oscillation signal, a second oscillation circuit configured to generate a second oscillation signal, a frequency measurement circuit configured to measure a frequency of the second oscillation signal based on the first oscillation signal in a first period in which the first oscillation circuit is in operation, a holding circuit configured to hold a measurement result by the frequency measurement circuit in a second period in which the first oscillation circuit is not in operation, and an oscillation signal generation circuit configured to generate a third oscillation signal based on the second oscillation signal and the measurement result held in the holding circuit in a third period in which the first oscillation circuit starts up, wherein the third oscillation signal is supplied to the first oscillation circuit in the third period.Type: GrantFiled: June 24, 2020Date of Patent: June 22, 2021Inventors: Hideo Haneda, Akio Tsutsumi, Hisahiro Ito -
Publication number: 20210184685Abstract: A charge pump includes: a switch circuit that switches a current source conducted to an output node based on a signal from a phase frequency detector included in a PLL circuit; a first current source that is the current source provided between a high potential node and the switch circuit, and supplies a current to the output node by a first conduction-type depletion mode MOS transistor forming a self-bias circuit; and a second current source that is the current source provided between a low potential node and the switch circuit, and draws the current from the output node by the first conduction-type depletion mode MOS transistor forming the self-bias circuit.Type: ApplicationFiled: December 10, 2020Publication date: June 17, 2021Inventors: Ryo ICHIKAWA, Hisahiro ITO
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Oscillation Circuit, Oscillator, Communication Device, And Method Of Controlling Oscillation Circuit
Publication number: 20200412371Abstract: An oscillation circuit includes a first oscillation circuit configured to oscillate a resonator to generate a first oscillation signal, a second oscillation circuit configured to generate a second oscillation signal, a frequency measurement circuit configured to measure a frequency of the second oscillation signal based on the first oscillation signal in a first period in which the first oscillation circuit is in operation, a holding circuit configured to hold a measurement result by the frequency measurement circuit in a second period in which the first oscillation circuit is not in operation, and an oscillation signal generation circuit configured to generate a third oscillation signal based on the second oscillation signal and the measurement result held in the holding circuit in a third period in which the first oscillation circuit starts up, wherein the third oscillation signal is supplied to the first oscillation circuit in the third period.Type: ApplicationFiled: June 24, 2020Publication date: December 31, 2020Inventors: Hideo HANEDA, Akio TSUTSUMI, Hisahiro ITO -
Patent number: 10850972Abstract: A vibrator device includes a base, a vibrator that includes a vibrator element and a vibrator element package, which accommodates the vibrator element and has a first terminal on a surface on a base side, a circuit element that is disposed between the base and the vibrator and has a first connection pad on a surface on a vibrator side, and a conductive connecting member that is disposed between the circuit element and the vibrator, bonds the circuit element and the vibrator together, and electrically connects the first connection pad and the first terminal together.Type: GrantFiled: March 7, 2018Date of Patent: December 1, 2020Assignee: SEIKO EPSON CORPORATIONInventor: Hisahiro Ito
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Patent number: 10784817Abstract: Provided is an oscillator including a resonator which includes a resonator element and a resonator element container accommodating the resonator element, an integrated circuit element which includes an inductor, and a nonconductive spacer member, in which the resonator and the integrated circuit element are stacked above each other, the resonator has a metal member, and the spacer member is provided between the resonator and the integrated circuit element.Type: GrantFiled: October 28, 2019Date of Patent: September 22, 2020Assignee: Seiko Epson CorporationInventor: Hisahiro Ito
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Patent number: 10771013Abstract: An oscillator includes: an external terminal, a resonator, and an oscillation circuit that oscillates the resonator, in which the oscillation circuit includes an amplification circuit and a current source which supplies a current to the amplification circuit, in which the current is set according to a first control signal which is input from the external terminal and a drive level of the resonator is changed according to the setting of the current.Type: GrantFiled: February 22, 2018Date of Patent: September 8, 2020Assignee: SEIKO EPSON CORPORATIONInventor: Hisahiro Ito
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Patent number: 10742169Abstract: An oscillator includes a resonator and an integrated circuit element. The resonator includes a resonator element and a resonator element container accommodating the resonator element. The integrated circuit element includes an inductor. The resonator and the integrated circuit element are stacked on each other. The resonator includes a metal member, and the metal member does not overlap the inductor when viewed in a plan view.Type: GrantFiled: November 26, 2018Date of Patent: August 11, 2020Assignee: SEIKO EPSON CORPORATIONInventors: Hisahiro Ito, Tetsuya Otsuki, Shoichiro Kasahara
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Patent number: 10734969Abstract: A vibrator device includes a circuit element, which has a first terminal and is a quadrangle in plan view, a vibrator, which is disposed on an active surface and is a quadrangle in plan view, a base, on which the circuit element is disposed and which has a second terminal, and a wire which connects the first terminal and the second terminal together. In plan view of the circuit element, at least one side of the vibrator is disposed along a direction where the one side intersects each of two adjacent sides of the circuit element, and the vibrator does not overlap the first terminal.Type: GrantFiled: March 7, 2018Date of Patent: August 4, 2020Assignee: SEIKO EPSON CORPORATIONInventor: Hisahiro Ito