公开(公告)号：US12224710B2

公开(公告)日：2025-02-11

申请号：US18463212

申请日：2023-09-07

Applicant: STMicroelectronics International N.V.

Inventor： Anand Kumar ,  Nitin Jain

IPC: H03B5/06 ,  H03B5/36

Abstract: A low power crystal oscillator circuit having a high power part and a low power part. Oscillation is initialized using the high power part. Once the crystal is under stable oscillation, the circuit switches to the low power part and continue operation for a long duration.

公开(公告)号：US12184233B2

公开(公告)日：2024-12-31

申请号：US18037648

申请日：2021-11-19

Applicant: Nordic Semiconductor ASA

Inventor： Hsin-Ta Wu

IPC: H03B5/36 ,  G05F3/24 ,  G05F3/26 ,  H03B5/04

Abstract: An amplitude regulator circuit portion is arranged to supply a current to an inverter in an oscillator circuit. The regulator monitors a voltage at the input terminal of the inverter and varies the current supplied to the inverter in response to the monitored voltage. The amplitude regulator comprises first, second, and third PMOS transistors, and first and second NMOS transistors and is arranged such that an input node is connected to the input terminal of the inverter, a respective gate terminal of each of the first and second NMOS transistors, and a respective drain terminal of the first NMOS and first PMOS transistors. The amplitude regulator also comprises a back-bias circuit portions arranged to vary a back-bias voltage at a back-gate terminal of the second NMOS transistor, to vary a threshold voltage, where the threshold voltage of the second NMOS transistor is lower than that of the first NMOS transistor.

公开(公告)号：US20240421767A1

公开(公告)日：2024-12-19

申请号：US18613447

申请日：2024-03-22

Applicant: SEIKO EPSON CORPORATION

Inventor： Yosuke ITASAKA ,  Takashi NOMIYA

IPC: H03B5/04 ,  H03B5/36

Abstract: A circuit device is configured to switching between a first mode in which phase noise of an output clock signal is low and a second mode in which power consumption is small, and includes an oscillation circuit configured to generate an oscillation signal, an output circuit configured to output the output clock signal, a temperature sensor configured to output a temperature detection signal, a temperature compensation circuit configured to perform temperature compensation on an oscillation frequency based on the temperature detection signal, and a control circuit. The control circuit performs control such that a power supply voltage supplied to the oscillation circuit in the first mode is higher than a power supply voltage supplied to the oscillation circuit in the second mode. In addition, the control circuit performs control such that at least one of a reference voltage supplied to the temperature compensation circuit and a reference current supplied to the temperature sensor does not change between the first mode and the second mode.

公开(公告)号：US20240333216A1

公开(公告)日：2024-10-03

申请号：US18617758

申请日：2024-03-27

Applicant: SEIKO EPSON CORPORATION

Inventor： Teppei HIGUCHI ,  Sho MATSUZAKI ,  Yuichi TORIUMI ,  Toshiya USUDA

IPC: H03B5/36 ,  H03B5/04 ,  H03B5/32

CPC classification number: H03B5/364 ,  H03B5/04 ,  H03B5/326

Abstract: A circuit device includes: a first terminal and a second terminal coupled to a resonator; a third terminal; a fourth terminal; a first switch provided on a signal path between the first terminal and the third terminal; a second switch provided on a signal path between the second terminal and the fourth terminal; and a register configured to output a signal for controlling the first switch and the second switch to be turned on or off. In a first mode, the first switch and the second switch are turned off, a control signal is input to the third terminal, and a clock signal is output from the fourth terminal. In a second mode, the first switch and the second switch are turned on.

公开(公告)号：US20240333214A1

公开(公告)日：2024-10-03

申请号：US18615496

申请日：2024-03-25

Applicant: ROHM Co., LTD.

Inventor： Nozomu Koja ,  Kenichi Motoki

IPC: H03B5/36 ,  H03B5/12

CPC classification number: H03B5/364 ,  H03B5/1228 ,  H03B2200/0082

Abstract: Provided is an oscillation circuit including a first terminal to which a first end of a crystal resonator is to be connected, a second terminal to which a second end of the crystal resonator is to be connected, a first resistor connected between the first terminal and the second terminal, a first transistor that is an N-channel transistor whose source is grounded, whose gate is connected to the first terminal, and whose drain is connected to the second terminal, a second transistor that is a P-channel transistor whose drain is connected to the drain of the first transistor, a third transistor that is a P-channel transistor biased by a constant current. A first state in which the first transistor and the second transistor operate as an inverter circuit, and a second state in which the second transistor and the third transistor operate as a current mirror circuit are switchable.

公开(公告)号：US20240291434A1

公开(公告)日：2024-08-29

申请号：US18585456

申请日：2024-02-23

Applicant: SEIKO EPSON CORPORATION

Inventor： Mitsuaki SAWADA

IPC: H03B5/36 ,  H03B5/04

CPC classification number: H03B5/36 ,  H03B5/04 ,  H03B2200/009

Abstract: A circuit device includes an oscillation circuit configured to generate an oscillation signal, a waveform shaping circuit configured to perform waveform shaping on the oscillation signal, and a regulator configured to supply a regulated power supply voltage to the waveform shaping circuit. The circuit device further includes an amplitude detection circuit configured to detect the amplitude of the oscillation signal and output an amplitude detection signal, and a power supply control circuit configured to perform control on the regulator based on the amplitude detection signal, such that the regulated power supply voltage becomes smaller than the amplitude of the oscillation signal.

公开(公告)号：US12040748B2

公开(公告)日：2024-07-16

申请号：US17471563

申请日：2021-09-10

Applicant: SEIKO EPSON CORPORATION

Inventor： Jun Watanabe

IPC: H03B5/36 ,  G01D5/24 ,  H03B5/06 ,  H03B5/32 ,  H03K19/20

CPC classification number: H03B5/36 ,  G01D5/2405 ,  H03B5/06 ,  H03B5/32 ,  H03K19/20 ,  H03B2200/0022

Abstract: The oscillation circuit includes a drive circuit and an amplitude limiting circuit. A vibrator-output signal is input to the drive circuit from one end of the vibrator, and the drive circuit outputs a drive signal obtained by inverting the vibrator-output signal. The amplitude limiting circuit is disposed between an output node of the drive circuit and the other end of the vibrator, and outputs an amplitude-limited drive signal obtained by reducing an amplitude of the drive signal to the other end of the vibrator.

公开(公告)号：US20240146245A1

公开(公告)日：2024-05-02

申请号：US18497080

申请日：2023-10-30

Applicant: SEIKO EPSON CORPORATION

Inventor： Hisashi YAMAGUCHI

IPC: H03B5/36 ,  H03B5/04

CPC classification number: H03B5/36 ,  H03B5/04

Abstract: A circuit device includes an oscillation circuit, a control circuit, a first power supply line, a second power supply line, a nonvolatile memory, a volatile memory, and a power supply switch circuit. The oscillation circuit generates a clock signal by oscillating a resonator. The control circuit performs a real-time clock process based on the clock signal. The nonvolatile memory operates at a first power supply voltage from the first power supply line. The volatile memory operates at a second power supply voltage from the second power supply line. The power supply switch circuit performs control of switching between supply and non-supply of the first power supply voltage to the first power supply line and control of switching between supply and non-supply of the second power supply voltage to the second power supply line.

公开(公告)号：US20240136976A1

公开(公告)日：2024-04-25

申请号：US18278424

申请日：2022-02-28

Applicant: DAISHINKU CORPORATION

Inventor： Takuya KOJO

IPC: H03B5/36 ,  H03B5/04

CPC classification number: H03B5/36 ,  H03B5/04

Abstract: One or more embodiments of the disclosure may be an oven-controlled crystal oscillator that may include a core section hermetically encapsulated inside a thermal insulation package. The core section includes at least: an oscillation IC; a crystal resonator; and a heater IC. The core section is mounted on a core substrate that is mechanically connected to the package by a non-conductive adhesive. The core section and the package are electrically connected to each other by wire bonding. A space is provided between the core substrate and a bottom surface of the package.

公开(公告)号：US20240022211A1

公开(公告)日：2024-01-18

申请号：US18342888

申请日：2023-06-28

Applicant: Renesas Electronics Corporation

Inventor： Soshiro NISHIOKA

IPC: H03B5/36

CPC classification number: H03B5/364

Abstract: A semiconductor device includes a crystal oscillator circuit, a first noise application circuit, and a second noise application circuit. The first noise application circuit is connected to the crystal oscillator circuit and is configured to drive a crystal resonator by selectively applying initial noises of opposite phases to a first external terminal and a second external terminal. The second noise application circuit applies a second noise to the first external terminal by amplifying a signal at the first external terminal and returning the amplified signal to the first external terminal, thereby driving an oscillation amplifier and a crystal resonator of the crystal oscillator circuit and shortening a start-up time of the crystal oscillator circuit.