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公开(公告)号：US12085525B2
公开(公告)日：2024-09-10
申请号：US18470066
申请日：2023-09-19
发明人： Tejasvi Das , Siddharth Maru , John L. Melanson
IPC分类号： G01N27/02
CPC分类号： G01N27/025 , G01N27/028
摘要： A system may include a resonant sensor configured to sense a physical quantity, a measurement circuit communicatively coupled to the resonant sensor and configured to measure one or more resonance parameters associated with the resonant sensor and indicative of the physical quantity using an incident/quadrature detector having an incident channel and a quadrature channel and perform a calibration of a non-ideality between the incident channel and the quadrature channel of the system, the calibration comprising determining the non-ideality by controlling the sensor signal, an oscillation signal for the incident channel, and an oscillation signal for the quadrature channel; and correcting for the non-ideality.
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公开(公告)号：US11972105B2
公开(公告)日：2024-04-30
申请号：US17962086
申请日：2022-10-07
发明人： Hamid Sepehr , Pablo Peso Parada , Willem Zwart , Tom Birchall , Michael Allen Kost , Tejasvi Das , Siddharth Maru , Matthew Beardsworth , Bruce E. Duewer
CPC分类号： G06F3/0488 , G06F3/0412 , G06F3/0414 , G01L5/162 , G01L5/164 , G01L5/165 , G01L5/167 , G06F2203/04105 , H04M2250/22
摘要： A force sensing system for determining if a user input has occurred, the system comprising: an input channel, to receive an input from at least one force sensor; an activity detection stage, to monitor an activity level of the input from the at least one force sensor and, responsive to an activity level which may be indicative of a user input being reached, to generate an indication that an activity has occurred at the force sensor; and an event detection stage to receive said indication, and to determine if a user input has occurred based on the received input from the at least one force sensor.
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公开(公告)号：US11522509B2
公开(公告)日：2022-12-06
申请号：US17194395
申请日：2021-03-08
发明人： Xin Zhao , Tejasvi Das , Xiaofan Fei
IPC分类号： H03F3/45
摘要： An operational amplifier with one or more fully-differential amplifier stages has a common-mode control input. A low-frequency feedback control path is coupled between an output of the fully-differential amplifier stages and the common-mode control input to control low-frequency drift of the common-mode voltage of the output of the stages. A high-frequency feed-forward control path couples a pair of inputs of the stages to control high-frequency ripple of a common-mode voltage of the inputs of the stages. One or more of the differential amplifier stages may have a bias input that controls a direct-current (DC) bias voltage of gates of pull-up transistors of the stage that is both DC and capacitively coupled to the gates so that the stage operates with class A bias at DC and with class AB bias at high frequencies.
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公开(公告)号：US20220286098A1
公开(公告)日：2022-09-08
申请号：US17194395
申请日：2021-03-08
发明人： Xin Zhao , Tejasvi Das , Xiaofan Fei
IPC分类号： H03F3/45
摘要： An operational amplifier with one or more fully-differential amplifier stages has a common-mode control input. A low-frequency feedback control path is coupled between an output of the fully-differential amplifier stages and the common-mode control input to control low-frequency drift of the common-mode voltage of the output of the stages. A high-frequency feed-forward control path couples a pair of inputs of the stages to control high-frequency ripple of a common-mode voltage of the inputs of the stages. One or more of the differential amplifier stages may have a bias input that controls a direct-current (DC) bias voltage of gates of pull-up transistors of the stage that is both DC and capacitively coupled to the gates so that the stage operates with class A bias at DC and with class AB bias at high frequencies.
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公开(公告)号：US11093060B2
公开(公告)日：2021-08-17
申请号：US16679773
申请日：2019-11-11
发明人： Gregory C. Yancey , Michael Kost , Tejasvi Das , Siddharth Maru , Matthew Beardsworth , Vadim Konradi
摘要： A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.
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公开(公告)号：US10942610B2
公开(公告)日：2021-03-09
申请号：US16831323
申请日：2020-03-26
发明人： Siddharth Maru , Tejasvi Das , Luke Lapointe , Srdjan Marijanovic , Zhong You , Drew Kinney , Anthony S. Doy , Eric J. King
摘要： A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The system may also include a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.
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公开(公告)号：US10726873B2
公开(公告)日：2020-07-28
申请号：US16103288
申请日：2018-08-14
发明人： Ku He , Tejasvi Das , Xin Zhao , Xiaofan Fei
IPC分类号： G11B27/034 , G11B27/19
摘要： A polymorphic playback system is disclosed in which one or more parameters of a signal path of the polymorphic playback system are varied based on one or more characteristics of a playback signal processed by the signal path, wherein the polymorphic playback system may include a lower-latency detection filter, a higher-latency detection filter, and a control subsystem that uses the lower-latency detection filter for detecting the one or more first characteristics of the playback signal and uses the higher-latency detection filter for detecting the one or more second characteristics of the playback signal.
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8.发明授权公开(公告)号：US10725549B2
公开(公告)日：2020-07-28
申请号：US16294347
申请日：2019-03-06
发明人： Srdjan Marijanovic , Drew Kinney , Luke Lapointe , Siddharth Maru , Tejasvi Das , Anthony S. Doy , Zhong You
摘要： A system may include a tactile actuator for providing tactile feedback and a resonant phase sensing system. The resonant phase sensing system may include a resistive-inductive-capacitive sensor and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and the tactile actuator. The resistive-inductive-capacitive sensor may be configured to measure phase information associated with the resistive-inductive-capacitive sensor, based on the phase information, detect an indication of human interaction with the system proximate to the resistive-inductive-capacitive sensor, and trigger the tactile actuator to generate tactile feedback responsive to detecting the indication of human interaction.
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公开(公告)号：US10658988B1
公开(公告)日：2020-05-19
申请号：US15943125
申请日：2018-04-02
发明人： Miao Song , Xiaofan Franky Fei , Xin Zhao , Tejasvi Das , Lei Zhu , Jing Bai , Alan Mark Morton
摘要： A signal processing system may include a modulation stage configured to generate a modulated input signal, an open-loop switched mode driver coupled to the modulation stage and configured to generate an output signal from the modulated input signal, a voltage regulator configured to generate a supply voltage that supplies electrical energy to the open-loop switched mode driver, and a control subsystem configured to, when a magnitude of the modulated input signal falls below a threshold magnitude, control the voltage regulator to control the supply voltage such that the output signal varies non-linearly with the modulated input signal for magnitudes of the modulated input signal below the threshold magnitude.
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公开(公告)号：US10181845B1
公开(公告)日：2019-01-15
申请号：US15927691
申请日：2018-03-21
发明人： Tejasvi Das , Alan Mark Morton , Xin Zhao , Lei Zhu , Xiaofan Fei , Johann G. Gaboriau , John L. Melanson , Amar Vellanki
摘要： A system may include a digital pulse width modulator subsystem, a first path coupled to an output of the digital pulse width modulator subsystem and configured to drive an open-loop driver stage, a second path coupled to the output of the digital pulse width modulator subsystem and configured to drive a closed-loop analog pulse width modulator, a controller to select between the first path and the second path for processing a signal based on one or more characteristics of the signal, and a calibration subsystem configured to calibrate at least one of a first gain of the first path and a second gain of the second path in order that the first gain and the second gain are at least approximately equal at the time of switching selection between the first path and the second path or vice versa, in order to minimize artifacts due to the switching.
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