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公开(公告)号：US11592534B2
公开(公告)日：2023-02-28
申请号：US16909098
申请日：2020-06-23
发明人： David Brunner , Georg Schitter , Han Woong Yoo
摘要： A system includes a power driver, configured to generate an electric excitation; an oscillating system, configured to perform an oscillation induced by the electric excitation; a feedback detector, configured to detect a feedback measurement signal with to the oscillation; and a controller configured to operate: in a closed loop mode, to control the power driver to generate the electric excitation as a discontinuous electric excitation according to timing information obtained from the detected feedback measurement signal, to synchronize the discontinuous electric excitation with the detected feedback measurement signal; in a learning mode preceding the closed loop mode, to control the power driver to generate the electric excitation as a continuous electric excitation, to obtain timing information from the feedback measurement signal to be used, at least once, in the subsequent closed loop mode, to synchronize the discontinuous electric excitation with the detected feedback measurement signal.
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公开(公告)号：US10992306B1
公开(公告)日：2021-04-27
申请号：US16807005
申请日：2020-03-02
发明人： Chun Hung Wang
摘要： A self-start-up control circuit adaptable to an oscillation circuit includes a state circuit that generates a reset signal according to a level of a control voltage for a voltage-controlled oscillator (VCO) of the oscillation circuit; and a start-up circuit that starts up the VCO by generating an enable signal according to the reset signal.
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公开(公告)号：US10826500B2
公开(公告)日：2020-11-03
申请号：US16412777
申请日：2019-05-15
摘要： An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.
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4.发明授权公开(公告)号：US10673383B2
公开(公告)日：2020-06-02
申请号：US16136739
申请日：2018-09-20
发明人： Matthew Powell , Sudipta Sarkar
摘要： Embodiments of clock circuits disclosed herein include a crystal oscillator circuit, an injection oscillator coupled to kick-start the crystal oscillator circuit and a digital frequency calibration circuit coupled to recalibrate the injection oscillator. The crystal oscillator circuit is configured to generate a clock signal at a resonant frequency. The injection oscillator is coupled to supply an oscillation signal at an injection frequency to the crystal oscillator circuit to reduce a start-up time of the crystal oscillator circuit. The digital frequency calibration circuit is coupled to receive the resonant frequency and the injection frequency as inputs, and configured to supply a digital control signal to the injection oscillator to set the injection frequency of the injection oscillator substantially equal to the resonant frequency of the crystal oscillator circuit. Methods are provided herein to recalibrate the injection frequency of an injection oscillator over time, temperature and/or supply voltage.
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公开(公告)号：US10666196B2
公开(公告)日：2020-05-26
申请号：US16238491
申请日：2019-01-02
发明人： Baotian Hao , Weitie Wang , Chao Li
摘要： A crystal oscillator control circuit includes a first terminal and a second terminal, a current source, and a peak detection and bias voltage adjustment circuit. The first terminal and the second terminal are arranged to couple the crystal oscillator control circuit to a crystal. The current source is coupled to a power supply voltage and generates a bias current. The peak detection and bias voltage adjustment circuit is coupled between the bias current and a ground voltage and coupled to the first terminal, and performs peak detection and bias voltage adjustment to correspondingly generate a first signal at a node. The low-pass filter low-pass filters the first signal to generate a filtered signal. The feedback control circuit is arranged to perform feedback control according to the filtered signal to generate an oscillation signal at one or both of the first terminal and the second terminal.
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公开(公告)号：US10651827B2
公开(公告)日：2020-05-12
申请号：US15364420
申请日：2016-11-30
发明人： Yafei Hu , Liu Han , Kapil Jain , Jin Xie
IPC分类号： H03K3/012 , G06F1/324 , G06F1/3287 , G06F1/3231 , G10L15/10 , G10L25/21 , G10L25/78 , H04R3/00 , H03K5/15 , H03L3/00 , G10L15/08 , H03K19/00 , G06F1/04
摘要： Aspects of the disclosure include an apparatus that has a first clock generator and a second clock generator. The first clock generator is configured to drive a first circuit, causing the first circuit to (i) receive a signal corresponding to an audio input, and (ii) determine whether an energy level of the signal exceeds a predetermined threshold. The second clock generator is activated when the first circuit determines that the energy level of the signal exceeds the predetermined threshold. The second clock generator is configured to drive a second circuit, causing the second circuit to determine whether the signal matches a predetermined pattern. A third circuit is activated when the second circuit determines that the signal matches the predetermined pattern.
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公开(公告)号：US20170288680A1
公开(公告)日：2017-10-05
申请号：US15436892
申请日：2017-02-20
申请人： Semiconductor Manufacturing International (Shanghai) Corporation , Semiconductor Manufacturing International (Beijing) Corporation
发明人： Er Yuan FENG , Zhen Jiang SU , Zhen Ye GUO
摘要： A crystal oscillator circuit is provided. The crystal oscillator circuit includes an oscillator start-up circuit having a first output terminal and a second output terminal, where the second output terminal outputs a first oscillation signal; and a waveform conversion circuit configured to convert the first oscillation signal to a rectangular wave signal. The crystal oscillator circuit also includes a first current source configured to output a first current to drive the oscillator start-up circuit; and a second current source configured to output a second current, and being connected in parallel with the first current source to jointly drive the oscillator start-up circuit. Further the crystal oscillator circuit includes a pulse generation circuit configured to generate a control pulse signal to control the second current source to output the second current after power on and to stop outputting the second current after a preset time.
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公开(公告)号：US09742354B2
公开(公告)日：2017-08-22
申请号：US15341352
申请日：2016-11-02
CPC分类号： H03B5/1293 , H03B5/04 , H03B5/06 , H03B5/1212 , H03B5/1228 , H03B5/1234 , H03B5/124 , H03B5/1278 , H03B5/129 , H03B2200/0094 , H03K3/0315 , H03L1/00 , H03L3/00 , H03L5/00 , H03L7/099
摘要： The present disclosure provides methods and apparatus for dynamically adjusting the common mode voltage at the LC tank node and/or the power supply voltage of a VCO with an LC resonator in order to force oscillation start-up by temporarily increasing gain. Methods according to certain preferred embodiments may reduce power consumption and/or overcome threshold voltage limitations and/or increase frequency and frequency tuning range during normal (steady-state) operation.
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公开(公告)号：US20170237441A1
公开(公告)日：2017-08-17
申请号：US15314843
申请日：2014-06-02
CPC分类号： H03L3/00 , H03B5/32 , H03B2200/0012 , H03B2200/0062 , H03B2200/0066 , H03B2200/0082 , H03B2200/0094 , H03L5/00
摘要： An oscillator circuit (100) comprises a crystal oscillator (10) arranged to generate an oscillation signal, a bias current generator (20) arranged to supply a bias current to the crystal oscillator (10), and a feedback stage (30) arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator (20) is arranged to: in response to a supply of power to the oscillator circuit (100) being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator (10), supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.
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公开(公告)号：US20170054413A1
公开(公告)日：2017-02-23
申请号：US15341352
申请日：2016-11-02
CPC分类号： H03B5/1293 , H03B5/04 , H03B5/06 , H03B5/1212 , H03B5/1228 , H03B5/1234 , H03B5/124 , H03B5/1278 , H03B5/129 , H03B2200/0094 , H03K3/0315 , H03L1/00 , H03L3/00 , H03L5/00 , H03L7/099
摘要： The present disclosure provides methods and apparatus for dynamically adjusting the common mode voltage at the LC tank node and/or the power supply voltage of a VCO with an LC resonator in order to force oscillation start-up by temporarily increasing gain. Methods according to certain preferred embodiments may reduce power consumption and/or overcome threshold voltage limitations and/or increase frequency and frequency tuning range during normal (steady-state) operation.
摘要翻译： 本公开提供用于动态地调节LC槽节点处的共模电压和/或具有LC谐振器的VCO的电源电压以便通过暂时增加增益来迫使振荡启动的方法和装置。 根据某些优选实施例的方法可以在正常（稳态）操作期间降低功耗和/或克服阈值电压限制和/或增加频率和频率调谐范围。
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