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公开(公告)号：USRE50090E1
公开(公告)日：2024-08-20
申请号：US17474452
申请日：2021-09-14
Applicant: SEIKO EPSON CORPORATION
Inventor： Takehiro Yamamoto
Abstract: A semiconductor circuit device includes an oscillation circuit, an output circuit that receives a signal output from an oscillation circuit and outputs an oscillation signal, a temperature sensing element, a characteristic adjustment circuit that adjusts characteristics of the oscillation circuit on the basis of a signal output from the temperature sensing element, and a first connection terminal that is electrically connected to the output circuit and via which the oscillation signal is output, in which a distance between the output circuit and the first connection terminal is shorter than a distance between the temperature sensing element and the first connection terminal in a plan view.
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公开(公告)号：US20240030871A1
公开(公告)日：2024-01-25
申请号：US18354988
申请日：2023-07-19
Applicant: SEIKO EPSON CORPORATION
Inventor： Hisahiro ITO , Saneyuki IMAMURA , Akio TSUTSUMI
Abstract: 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.
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公开(公告)号：US20240007051A1
公开(公告)日：2024-01-04
申请号：US18124859
申请日：2023-03-22
Applicant: GigaDevice Semiconductor Inc.
Inventor： Yunchao LIU , Sanlin LIU
CPC classification number: H03B5/364 , H03B5/06 , H03B2200/0038
Abstract: An oscillator circuit is provided and includes first and second terminals; an amplification circuit with an input end and an out end coupled to a first end and a second end of a crystal circuit through the first terminal and the second terminal, respectively; a gain control circuit coupled to the amplification circuit and including a differential amplifier, a first current source, a feedback path and a current mirror, wherein: the differential amplifier includes first and second transistors, sources of the first and second transistors are coupled to the first current source; a gate of the first transistor is coupled to a first direct current voltage and coupled to the input end or the output end through the feedback path; a gate of the second transistor is coupled to a second direct current voltage; the current mirror mirrors a current flowing through the second transistor to the amplification circuit.
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公开(公告)号：US20190199288A1
公开(公告)日：2019-06-27
申请号：US15853942
申请日：2017-12-25
Applicant: GOODIX TECHNOLOGY INC.
Inventor： Amr Abuellil , Janakan Sivasubramaniam
CPC classification number: H03B5/36 , H03B5/06 , H03B5/364 , H03B29/00 , H03B2200/0074 , H03B2200/0094 , H03L3/00
Abstract: Embodiments can provide individualized controlling of noise injection during startup of a crystal oscillator. In some embodiments, a simple learning block can be placed in parallel to a oscillator circuit to control noise injection during the startup of the crystal oscillator. The learning block can be configured to control the noise injection during the startup of the crystal oscillator by determining whether the crystal oscillator has been stabilized. In some embodiments, an adjustment block may be employed to adjust the count determined by the learning block based on one or more measured characteristics of the crystal oscillator during a startup of the crystal oscillator. In some embodiments, a simple block that creates a negative capacitance can be configured in parallel to the crystal oscillator.
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5.发明申请公开(公告)号：US20190007012A1
公开(公告)日：2019-01-03
申请号：US15639038
申请日：2017-06-30
Applicant: SILICON LABORATORIES INC.
Inventor： TIAGO MARQUES
CPC classification number: H03F3/45179 , H01L27/0727 , H03B5/06 , H03B5/364 , H03B5/366 , H03B2200/0094 , H03F3/16 , H03F3/193 , H03L3/00 , H03L5/02
Abstract: A crystal amplifier for driving a crystal to oscillate at a resonant frequency including a controlled current source, a primary amplifier core, a high gain amplifier core, and a controller. Both amplifier cores are coupled in parallel, and each has an input coupled to an amplifier input node and an output coupled to an amplifier output node coupled across the crystal. The current source provides a core bias current to the source node. The controller enables the high gain amplifier core and sets the core bias current to a high current level to achieve a high negative resistance at a startup time, and then disables the high gain amplifier core and sets the core bias current to a lower steady state current level after oscillation is achieved. A level detector may be used for detecting oscillation and for determining when to adjust the core bias current.
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Patent Agency Ranking
公开(公告)号：US20190006990A1
公开(公告)日：2019-01-03
申请号：US15724714
申请日：2017-10-04
Applicant: SILICON LABORATORIES INC.
Inventor： TIAGO MARQUES , VITOR PEREIRA
IPC: H03B5/36
CPC classification number: H03B5/364 , H03B5/366 , H03B2200/0012 , H03B2200/0026 , H03B2200/004 , H03B2200/005 , H03B2200/0066 , H03F3/72
Abstract: A crystal driver integrated circuit with external oscillation signal amplitude control including an amplifier core, an input pin and an output pin, an adjustable capacitor, and a controller. The controller operates the amplifier core in any one of multiple operating modes including an oscillator mode and a bypass mode. During the bypass mode, the controller disables the amplifier core and adjusts the adjustable capacitor so that an amplitude of an oscillation signal received via the input pin from an external oscillator has a target amplitude. The external oscillation signal may be capacitively coupled for capacitive voltage division or directly coupled for impedance attenuation. An available voltage may be provided as a source voltage to the external oscillator via the output pin. An internal voltage regulator and/or switch may be included to re-provision the output pin to provide the source voltage during the bypass mode.
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公开(公告)号：US20180138860A1
公开(公告)日：2018-05-17
申请号：US15871427
申请日：2018-01-15
Applicant: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Inventor： Mengwen ZHANG
CPC classification number: H03B5/1234 , H03B5/1215 , H03B5/1228 , H03B5/32 , H03B5/364 , H03B2200/009 , H03K4/48 , H03K7/08
Abstract: An amplitude limiting oscillation circuit (100) is disclosed. The amplitude limiting oscillation circuit (100) includes: an oscillation circuit (110), configured to generate an oscillation signal; a pulse width modulation circuit (120), configured to generate a pulse width modulation signal according to an amplitude of the oscillation signal; a low pass filtering circuit (130), configured to convert the pulse width modulation signal into a direct current control voltage signal, where the direct current control voltage signal is configured to control a voltage controlled resistance circuit (140); and the voltage controlled resistance circuit (140), configured to change a resistance value of the voltage controlled resistance circuit (140) according to under the direct current control voltage signal, to control the amplitude of the oscillation signal. The amplitude limiting oscillation circuit (100), may improve performance of the amplitude limiting oscillation circuit (100).
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公开(公告)号：US20180076768A1
公开(公告)日：2018-03-15
申请号：US15266975
申请日：2016-09-15
Inventor： Jacob K. Easter , Christopher D. Macchietto , Richard Niescier
CPC classification number: H03G3/3036 , H03B5/364 , H03B2201/031
Abstract: At least one example embodiment provides a controller to sample a first signal. The first signal indicates an initial amplitude of an output signal of an oscillator circuit. The controller selects a step amount based on the first signal and a target amplitude of the output signal. The controller generates a control signal for the oscillator circuit based on the selected step amount. The control signal indicates a change in gain for the oscillator circuit according to the selected step amount.
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公开(公告)号：US20180054163A1
公开(公告)日：2018-02-22
申请号：US15240101
申请日：2016-08-18
Applicant: M2Communication Inc.
Inventor： Yang-Wen Chen , Chun-Yi Lee , Derrick Wei
IPC: H03B5/32 , H03K19/20 , H03K3/3565 , G06F1/10 , G06F1/32
CPC classification number: H03B5/32 , H03B5/06 , H03B5/364 , H03B2200/0038 , H03B2200/0082 , H03B2200/0094 , H03K3/011 , H03K3/02315 , H03K3/3565 , H03K19/20 , H03L3/00 , H03L5/00
Abstract: An oscillator module used with a plurality of power sources includes an oscillator unit, a clock monitor unit (CMU), a software module and a digital calibration circuit. The oscillator unit generates a clock signal. The CMU is coupled to the oscillator unit, determines whether an amplitude of the clock signal exceeds a predetermined threshold, and outputs an alarm signal if the amplitude of the clock signal is lower than the predetermined threshold. The software module is coupled to the CMU, and receives the alarm signal to output a calibration signal. The digital calibration circuit is coupled to the oscillator and the software module, and outputs a control signal in response to the clock signal and the calibration signal, adjusting the plurality of power sources to modify the clock signal.
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公开(公告)号：US09634672B2
公开(公告)日：2017-04-25
申请号：US14993733
申请日：2016-01-12
Applicant: SEIKO EPSON CORPORATION
Inventor： Takehiro Yamamoto
Abstract: A semiconductor circuit device includes an oscillation circuit, an output circuit that receives a signal output from an oscillation circuit and outputs an oscillation signal, a temperature sensing element, a characteristic adjustment circuit that adjusts characteristics of the oscillation circuit on the basis of a signal output from the temperature sensing element, and a first connection terminal that is electrically connected to the output circuit and via which the oscillation signal is output, in which a distance between the output circuit and the first connection terminal is shorter than a distance between the temperature sensing element and the first connection terminal in a plan view.
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