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公开(公告)号：US20210373502A1
公开(公告)日：2021-12-02
申请号：US16974352
申请日：2020-08-06
Applicant: Seiko Epson Corporation
Inventor： Yasuhiro Sudo , Akio Tsutsumi
Abstract: Provided is a circuit device including: a clock signal generation circuit generating a plurality of multi-phase clock signals; a time-to-digital conversion circuit performing a count operation based on an i-th clock signal that corresponds to a multi-phase clock signal, to obtain a count value that corresponds to a time difference between transition timings of a first signal and a second signal, to obtain a first digital value that corresponds to a time difference between transition timings of the first signal and a j-th clock signal that corresponds to a multi-phase clock signal, and to obtain a second digital value that corresponds to a time difference between transition timings of the second signal and a k-th clock signal that corresponds to a multi-phase clock signal; and a processing circuit obtaining a digital value that corresponds to the time difference based on the count value, the first digital value, and the second digital value.
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公开(公告)号：US11115028B2
公开(公告)日：2021-09-07
申请号：US16809159
申请日：2020-03-04
Applicant: SEIKO EPSON CORPORATION
Inventor： Yasuhiro Sudo
Abstract: Provided is an oscillator including: a first resonator; a second resonator; a first oscillation circuit generating a first oscillation signal by oscillating the first resonator; a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator; a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data; a storage unit storing information on a learned model that is machine-learned to output data corresponding to the temperature compensation data with respect to input data; and a processing circuit obtaining the temperature compensation data by performing processing based on the information on the learned model with respect to the input data based on the first oscillation signal and the second oscillation signal.
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公开(公告)号：US10771010B2
公开(公告)日：2020-09-08
申请号：US16367334
申请日：2019-03-28
Applicant: Seiko Epson Corporation
Inventor： Yasuhiro Sudo
Abstract: A circuit device includes a processing circuit and an oscillation signal generation circuit. The processing circuit performs Kalman filter processing for a result of phase comparison between an input signal based on an oscillation signal and a reference signal and performs loop filter processing for the result of phase comparison. The oscillation signal generation circuit generates the oscillation signal of an oscillation frequency set by frequency control data which is output data of the loop filter processing by using the frequency control data and a resonator. The processing circuit estimates a truth value for an observed value of the result of phase comparison by using the Kalman filter processing.
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公开(公告)号：US11070212B2
公开(公告)日：2021-07-20
申请号：US16809186
申请日：2020-03-04
Applicant: SEIKO EPSON CORPORATION
Inventor： Yasuhiro Sudo
Abstract: Provided is an oscillator including: a first resonator; a second resonator; a first oscillation circuit generating a first oscillation signal by oscillating the first resonator; a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator; a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data; and a processing circuit performing time digital conversion processing based on the first oscillation signal and the second oscillation signal, and obtaining the temperature compensation data based on measurement data of the time digital conversion processing.
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公开(公告)号：US11038509B2
公开(公告)日：2021-06-15
申请号：US16999318
申请日：2020-08-21
Applicant: Seiko Epson Corporation
Inventor： Tomoaki Takahashi , Yasuhiro Sudo
Abstract: A circuit device includes an oscillation circuit and a processing circuit. The oscillation circuit includes a variable capacitance circuit configured by a capacitor array and oscillates at an oscillation frequency corresponding to the capacitance value of the variable capacitance circuit. First temperature data and second temperature data subsequent to the first temperature data are input to the processing circuit as temperature data. In the period between the start of the capacitance control based on the first temperature data and the start of the capacitance control based on the second temperature data, the processing circuit switches the first capacitance control data corresponding to the first temperature data and the second capacitance control data different from the first capacitance control data in a time-division manner to be output to the variable capacitance circuit.
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Patent Agency Ranking
公开(公告)号：US11005478B2
公开(公告)日：2021-05-11
申请号：US16257350
申请日：2019-01-25
Applicant: Seiko Epson Corporation
Inventor： Hideo Haneda , Yasuhiro Sudo
Abstract: An integrated circuit device includes first and second temperature sensors, an A/D conversion circuit that performs A/D conversion on first and second temperature detection voltages from the first and second temperature sensors and outputs first and second temperature detection data, a connection terminal that is electrically connected to a temperature detection target device of the first and second temperature sensors, and a digital signal processing circuit that performs digital calculation based on the first and second temperature detection data and performs a temperature compensation process of correcting temperature characteristics of the temperature detection target device.
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公开(公告)号：US20240364262A1
公开(公告)日：2024-10-31
申请号：US18646093
申请日：2024-04-25
Applicant: SEIKO EPSON CORPORATION
Inventor： Tomohiro Uno , Yasuhiro Sudo , Kentaro Seo
Abstract: An oscillator includes a resonator element, a temperature control element that controls a temperature of the resonator element, a microcontroller that stores a temperature control program and controls an operation of the temperature control element based on the temperature control program, and an interface circuit, in which the temperature control program is rewritable via the interface circuit.
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公开(公告)号：US11567529B2
公开(公告)日：2023-01-31
申请号：US17131846
申请日：2020-12-23
Applicant: Seiko Epson Corporation
Inventor： Hideo Haneda , Yasuhiro Sudo , Akio Tsutsumi
Abstract: A real-time clock device includes a resonator, a clock signal generation circuit, a time-counting circuit, a terminal, and a time-to-digital conversion circuit. The clock signal generation circuit outputs a time-counting clock signal based on an oscillation clock signal. The time-counting circuit generates time-counting data based on the time-counting clock signal. An external signal is input to the terminal. The time-to-digital conversion circuit measures a time difference between a transition timing of a first signal based on the external signal and a transition timing of a second signal based on the oscillation clock signal or the time-counting clock signal with a resolution higher than a time-counting resolution of the time-counting circuit, and obtains time difference information corresponding to the time difference.
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公开(公告)号：US11320792B2
公开(公告)日：2022-05-03
申请号：US16974352
申请日：2020-08-06
Applicant: Seiko Epson Corporation
Inventor： Yasuhiro Sudo , Akio Tsutsumi
Abstract: Provided is a circuit device including: a clock signal generation circuit generating a plurality of multi-phase clock signals; a time-to-digital conversion circuit performing a count operation based on an i-th clock signal that corresponds to a multi-phase clock signal, to obtain a count value that corresponds to a time difference between transition timings of a first signal and a second signal, to obtain a first digital value that corresponds to a time difference between transition timings of the first signal and a j-th clock signal that corresponds to a multi-phase clock signal, and to obtain a second digital value that corresponds to a time difference between transition timings of the second signal and a k-th clock signal that corresponds to a multi-phase clock signal; and a processing circuit obtaining a digital value that corresponds to the time difference based on the count value, the first digital value, and the second digital value.
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公开(公告)号：US10884041B2
公开(公告)日：2021-01-05
申请号：US15715719
申请日：2017-09-26
Applicant: Seiko Epson Corporation
Inventor： Katsuhiko Maki , Hideo Haneda , Takashi Kurashina , Akio Tsutsumi , Yasuhiro Sudo
Abstract: A physical quantity measurement apparatus includes a first resonator, a second oscillator, and an integrated circuit device. The integrated circuit device includes a first oscillation circuit that causes the first resonator to oscillate, and thus generate a first clock signal having a first clock frequency, a second oscillation circuit that causes the second oscillator to oscillate, and thus generate a second clock signal having a second clock frequency which is different from the first clock frequency, and a measurement unit that is provided with a time-to-digital conversion circuit which converts time into a digital value by using the first clock signal and the second clock signal.
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