公开(公告)号：US11539327B2

公开(公告)日：2022-12-27

申请号：US17488357

申请日：2021-09-29

Applicant: Seiko Epson Corporation

Inventor： Hideo Haneda ,  Yuichi Toriumi ,  Teppei Higuchi

IPC: H03B5/04 ,  H03B5/32

Abstract: A circuit device includes an oscillation circuit that generates an oscillation signal by using a vibrator, a frequency adjustment circuit that adjusts an oscillation frequency of the oscillation circuit based on frequency adjustment data, a temperature sensor circuit that outputs temperature data, an arithmetic operation circuit, and a storage circuit. The arithmetic operation circuit outputs converted temperature data by performing, on the temperature data, conversion processing in which a slope of the converted temperature data with respect to the temperature data in a first temperature range is different from a slope of the converted temperature data with respect to the temperature data in a second temperature range. The storage circuit stores a lookup table representing a correspondence between the converted temperature data and the frequency adjustment data.

公开(公告)号：US11587925B2

公开(公告)日：2023-02-21

申请号：US17590840

申请日：2022-02-02

Applicant: Seiko Epson Corporation

Inventor： Atsushi Tanaka ,  Teppei Higuchi

IPC: H01L27/06 ,  H03H9/05 ,  H03H9/10 ,  H01L49/02 ,  H03B5/36 ,  H03H9/19

Abstract: A variable capacitance circuit includes a capacitor array having a first capacitor in which a plurality of MIM capacitors are coupled in parallel and a second capacitor in which a plurality of MIM capacitors are coupled in series, and a switch array having a first switch and a second switch. A shape pattern of at least one of a first electrode of the first capacitor, a first ground shield, a second electrode of the second capacitor, and a second ground shield is set so that a first capacitance difference per 1 LSB between first capacitance values of the first capacitor when the first switch is turned on and off and a second capacitance difference per 1 LSB between second capacitance values of the second capacitor when the second switch is turned on and off are close to each other.

公开(公告)号：US20230020823A1

公开(公告)日：2023-01-19

申请号：US17863714

申请日：2022-07-13

Applicant: SEIKO EPSON CORPORATION

Inventor： Teppei Higuchi ,  Jun Uehara ,  Yuichi Toriumi ,  Hiroshi Kiya

IPC: H03B5/04 ,  H03B5/36

Abstract: A circuit device includes a first terminal, a first oscillation circuit oscillating a resonator and generating a first voltage for automatic gain control for controlling amplitude of a signal output from the resonator, a digital signal generation circuit generating a digital signal corresponding to the first voltage, and a first interface circuit outputting the digital signal to the first terminal.

公开(公告)号：US10826510B2

公开(公告)日：2020-11-03

申请号：US16728103

申请日：2019-12-27

Applicant: Seiko Epson Corporation

Inventor： Kimio Nagasaka ,  Yukihiro Hashi ,  Takahiro Kan ,  Tomohiro Tamura ,  Teppei Higuchi

IPC: H03L7/26 ,  H03B17/00

Abstract: An atomic oscillator includes: a light-emitting element; an atom cell that includes a first surface on which light beams from the light-emitting element are incident and a second surface from which the light beams incident on the first surface are emitted and accommodates alkali metal atoms in a gas state; a shield that accommodates the atom cell and has a magnetic shielding property, the shield having an opening; a heat transfer member that is in contact with a portion of the atom cell via an opening of the shield and has a thermal conductivity higher than a thermal conductivity of the atom cell; a temperature control element that is in contact with the heat transfer member and controls a temperature of the atom cell; and a light-receiving element that receives the light beams emitted from the second surface.

公开(公告)号：US12273071B2

公开(公告)日：2025-04-08

申请号：US18617695

申请日：2024-03-27

Applicant: SEIKO EPSON CORPORATION

Inventor： Teppei Higuchi ,  Sho Matsuzaki ,  Yuichi Toriumi ,  Toshiya Usuda

IPC: H03B5/36 ,  H03H9/10 ,  H03H9/25

Abstract: A circuit device includes: a first terminal and a second terminal coupled to a resonator; an amplifier circuit configured to amplify a signal from the first terminal and output the amplified signal to the second terminal; a variable resistance circuit that is provided on a signal path between the amplifier circuit and the second terminal and includes a variable resistor, a first switch provided at one end of the variable resistor, and a second switch provided at the other end of the variable resistor; a third switch coupled in parallel to the variable resistance circuit; and a control circuit configured to control a resistance value of the variable resistor and control the first switch, the second switch, and the third switch to be turned on or off.

公开(公告)号：US11791770B2

公开(公告)日：2023-10-17

申请号：US17863714

申请日：2022-07-13

Applicant: SEIKO EPSON CORPORATION

Inventor： Teppei Higuchi ,  Jun Uehara ,  Yuichi Toriumi ,  Hiroshi Kiya

IPC: H03B5/04 ,  H03B5/36

CPC classification number: H03B5/04 ,  H03B5/36

Abstract: A circuit device includes a first terminal, a first oscillation circuit oscillating a resonator and generating a first voltage for automatic gain control for controlling amplitude of a signal output from the resonator, a digital signal generation circuit generating a digital signal corresponding to the first voltage, and a first interface circuit outputting the digital signal to the first terminal.

公开(公告)号：US11616474B2

公开(公告)日：2023-03-28

申请号：US17483889

申请日：2021-09-24

Applicant: Seiko Epson Corporation

Inventor： Teppei Higuchi

IPC: H03B5/04 ,  H03K3/03 ,  H03B5/32

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. Further, the logic circuit or the power supply circuit is disposed between the oscillation circuit and the temperature sensor circuit.

公开(公告)号：US11652443B2

公开(公告)日：2023-05-16

申请号：US17587127

申请日：2022-01-28

Applicant: Seiko Epson Corporation

Inventor： Yuichi Toriumi ,  Hideo Haneda ,  Teppei Higuchi ,  Atsushi Tanaka

IPC: H03B5/04 ,  H03B5/32

CPC classification number: H03B5/04 ,  H03B5/32 ,  H03B2200/005 ,  H03B2201/025 ,  H03B2201/0208

Abstract: A circuit device includes an oscillation circuit and a processing circuit that generates capacitance control data. The oscillation circuit includes a variable capacitance circuit whose capacitance value is variably controlled based on the capacitance control data, and an oscillation frequency thereof is controlled based on the capacitance value of the variable capacitance circuit. The variable capacitance circuit includes a capacitor array. The capacitor array includes a plurality of capacitors each having a binary-weighted capacitance value, and a plurality of switches that are on-off controlled based on the capacitance control data. The processing circuit outputs the capacitance control data, which is subjected to dithering, so as to switch the capacitance value of the variable capacitance circuit between a first capacitance value and a second capacitance value in a time division manner.

公开(公告)号：US11616473B2

公开(公告)日：2023-03-28

申请号：US17483871

申请日：2021-09-24

Applicant: Seiko Epson Corporation

Inventor： Teppei Higuchi ,  Noboru Itomi

IPC: H03B5/04 ,  H03K3/03 ,  H03B5/32

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. The oscillation circuit is disposed in a circuit region, the temperature sensor circuit and the logic circuit are disposed in a circuit region, and the power supply circuit is disposed in a circuit region, which is positioned between the circuit region and the circuit region.

公开(公告)号：US11014571B2

公开(公告)日：2021-05-25

申请号：US16174653

申请日：2018-10-30

Applicant: Seiko Epson Corporation

Inventor： Noriyuki Murashima ,  Teppei Higuchi

IPC: B60W50/02 ,  G01C25/00 ,  G01C21/12 ,  G01C19/5614

Abstract: A physical quantity measurement device includes a sensor element in which coupling capacitances are formed between a drive electrode and a first detection electrode and between the drive electrode and a second detection electrode; and a circuit device that includes a drive circuit which supplies a drive signal to the drive electrode, a detection circuit which detects physical quantity information corresponding to a physical quantity based on first and second detection signals from the first and second detection electrodes, and a failure diagnosis circuit. The circuit device includes first and second switches that are provided between first and second terminals to which the first and second detection signals are input and the detection circuit. The failure diagnosis circuit performs a failure diagnosis, based on a detection result of the detection circuit when connection states of the first and second switches are changed.