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公开(公告)号：US09854357B1
公开(公告)日：2017-12-26
申请号：US15195626
申请日：2016-06-28
Inventor： Tejasvi Das , Anand Ilango
CPC classification number: H04R3/007 , H03F1/305 , H03F1/34 , H03F3/181 , H03F3/187 , H03F3/20 , H03F3/72 , H03F2200/03 , H03F2200/129 , H03F2200/381 , H03F2200/408 , H03G3/348 , H03M1/66
Abstract: A method may be provided for powering up or down a playback path comprising a digital-to-analog converter (DAC) for generating a non-ground-centered analog intermediate voltage centered at a common-mode voltage and coupled to a driver for generating a ground-centered playback path output voltage at an output of the driver wherein the output of the driver is clamped via a finite impedance to a ground voltage. The method may include transitioning continuously or in a plurality of discrete steps the analog intermediate voltage from an initial voltage to the common-mode voltage such that the transitioning is substantially inaudible at the output of the driver. A method for operating an output clamp of an output driver stage of a playback path may include transitioning continuously or in a plurality of discrete steps an impedance of the output clamp in order to match an output offset of the output driver stage in order to minimize audio artifacts appearing at an output of the output driver stage.
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公开(公告)号：US12292309B2
公开(公告)日：2025-05-06
申请号：US17211073
申请日：2021-03-24
Inventor： Siddharth Maru , Josh Sanz-Robinson , Tejasvi Das , John L. Melanson
Abstract: A system may include a plurality of sensors configured to sense a physical quantity and a calibration subsystem configured to perform a calibration comprising: comparing a measured characteristic from each of at least two sensors of the plurality of sensors to determine a sensitivity drift of at least one sensor of the plurality of sensors; based on the measured characteristics of the at least two sensors and stored reference characteristics for the at least two sensors, calculating a normalization factor; and applying the normalization factor to the measured characteristic of the at least one sensor to ensure sensitivity of the plurality of sensors relative to each other remains approximately constant.
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公开(公告)号：US12163986B2
公开(公告)日：2024-12-10
申请号：US17846832
申请日：2022-06-22
Inventor： Anand Ilango , Siddharth Maru , Tejasvi Das , John L. Melanson
Abstract: A system may include amplifier circuitry configured to drive an electromagnetic load with a driving signal and a processing system communicatively coupled to the electromagnetic load and configured to compensate for current-sensing error of the processing system caused by feedback circuitry of the amplifier circuitry.
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公开(公告)号：US11979115B2
公开(公告)日：2024-05-07
申请号：US17739480
申请日：2022-05-09
Inventor： Siddharth Maru , Chandra B. Prakash , Tejasvi Das
CPC classification number: H03F3/04 , B06B1/0207 , H03F2200/129 , H03F2200/481
Abstract: An amplifier system may include a first feedback loop coupled between an output of an amplifier to an input of a modulator for regulating an output voltage driven at the output of the amplifier to a first terminal of a load of the amplifier system, a sense resistor for sensing a physical quantity associated with the amplifier, a second control loop coupled to the sense resistor such that the sense resistor is outside of the second control loop, the second control loop configured to regulate a common-mode voltage at a second terminal of the load, and a common-mode feedforward circuit coupled to the sense resistor and configured to minimize effects of a signal-dependent common-mode feedback of the sense resistor.
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公开(公告)号：US11644494B1
公开(公告)日：2023-05-09
申请号：US17690402
申请日：2022-03-09
Inventor： Chandra B. Prakash , Tejasvi Das , Siddharth Maru
Abstract: Circuitry for driving a load, the circuitry comprising: driver circuitry; load sensing circuitry; and a parameter estimation engine, wherein the circuitry is operable in: a driving mode of operation in which the driver circuitry supplies a drive signal to a load coupled to the circuitry; and a load sensing mode of operation, for estimating a characteristic of a load coupled to the circuitry based on a signal output by the load sensing circuitry in response to a stimulus signal supplied to the driver circuitry, and wherein the circuitry is operable to perform a calibration operation in which the parameter estimation engine generates a circuit parameter for use in the load sensing mode based, at least in part, on a signal generated by the circuitry in response to a calibration stimulus signal supplied to the driver circuitry.
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Patent Agency Ranking
公开(公告)号：US11619519B2
公开(公告)日：2023-04-04
申请号：US17170174
申请日：2021-02-08
Inventor： Luke Lapointe , Siddharth Maru , Tejasvi Das
Abstract: A system may include a plurality of sensors, a measurement circuit communicatively coupled to the plurality of sensors and configured to measure one or more physical quantities associated with the plurality of sensors, and a predictive optimization subsystem configured to detect an event associated with a first sensor of the plurality of sensors and responsive to the event, execute a predictive action with respect to one or more of the other sensors of the plurality of sensors.
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公开(公告)号：US11536758B2
公开(公告)日：2022-12-27
申请号：US16517046
申请日：2019-07-19
Inventor： Jason L. Wardlaw , Michael A. Kost , Anthony S. Doy , Tejasvi Das , Siddharth Maru , Xin Zhao , Matthew Beardsworth , Bruce E. Duewer
Abstract: A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.
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公开(公告)号：US11418184B2
公开(公告)日：2022-08-16
申请号：US17494479
申请日：2021-10-05
Inventor： Matthew Beardsworth , Tejasvi Das , Siddharth Maru , Luke Lapointe
IPC: H03K17/14 , H03K17/975 , H03K17/97
Abstract: A system may include a sensor configured to output a sensor signal indicative of a distance between the sensor and a mechanical member associated with the sensor, a measurement circuit communicatively coupled to the sensor and configured to determine a physical force interaction with the mechanical member based on the sensor signal, and a compensator configured to monitor the sensor signal and to apply a compensation factor to the sensor signal to compensate for changes to properties of the sensor based on at least one of changes in a distance between the sensor and the mechanical member and changes in a temperature associated with the sensor.
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公开(公告)号：US11079874B2
公开(公告)日：2021-08-03
申请号：US16867223
申请日：2020-05-05
Inventor： Luke Lapointe , Tejasvi Das , Siddharth Maru
IPC: G06F3/041 , G06F21/50 , G06F3/0488 , H03K17/96
Abstract: A method may include receiving an input signal from a force sensor configured to sense a force associated with a human interaction with a virtual button, comparing the input signal to at least one behavioral model, the at least one behavioral model comprising one or more parameters associated with a valid human interaction with the virtual button, and determining whether a valid human interaction with the virtual button occurred based on the comparing.
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20.发明授权公开(公告)号：US11016572B2
公开(公告)日：2021-05-25
申请号：US16875006
申请日：2020-05-15
Inventor： Srdjan Marijanovic , Drew Kinney , Luke Lapointe , Siddharth Maru , Tejasvi Das , Anthony S. Doy , Zhong You
Abstract: 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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