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公开(公告)号：US20190260365A1
公开(公告)日：2019-08-22
申请号：US16144104
申请日：2018-09-27
Inventor： Ku HE , Tejasvi DAS , Xin ZHAO , Xiaofan FEI
Abstract: A method may include, in a system comprising a digital PWM subsystem having a tunable digital gain, a first path coupled to an output of the digital PWM subsystem and configured to drive an open-loop driver stage, and a second path coupled to the output of the digital PWM subsystem and configured to drive a closed-loop driver stage having a tunable analog gain: selecting one of the first path and the second path for processing an input signal to generate an output signal based on one or more characteristics of the input signal, setting the digital gain to a maximum digital gain and the analog gain to a minimum analog gain when the input signal is lesser than a first threshold, setting the digital gain to a minimum digital gain and the analog gain to a maximum analog gain when the input signal is greater than a second threshold magnitude, and varying the analog gain and the digital gain when the input signal is in a range greater than the first threshold and lesser than a second threshold.
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公开(公告)号：US20190257866A1
公开(公告)日：2019-08-22
申请号：US16121259
申请日：2018-09-04
Inventor： Gautham S. SIVASANKAR , Tejasvi DAS , Emmanuel MARCHAIS , Amar VELLANKI , Leyi YIN , John L. MELANSON , Venugopal CHOUKINISHI
Abstract: A method of determining a phase misalignment between a first signal generated from a first signal path and a second signal generated from a second signal path may include obtaining multiple samples of the first signal proximate to when the first signal crosses zero wherein the first signal can be approximated as linear; obtaining multiple samples of the second signal proximate to when the second signal crosses zero wherein the first signal can be approximated as linear; based on the multiple samples of the first signal, approximating a first time at which the first signal crosses zero; based on the multiple samples of the second signal, approximating a second time at which the second signal crosses zero; and determining the phase misalignment between the first signal and the second signal based on a difference between the first time and the second time.
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公开(公告)号：US20180205347A1
公开(公告)日：2018-07-19
申请号：US15925469
申请日：2018-03-19
Inventor： Tejasvi DAS , John L. MELANSON , Eric J. KING
Abstract: An audio amplifier circuit for providing an output signal to an audio transducer may include a power amplifier and a control circuit. The power amplifier may include an audio input for receiving an audio input signal, an audio output for generating the output signal based on the audio input signal, and a power supply input for receiving a power supply voltage, wherein the power supply voltage is variable among at least a first supply voltage and a second supply voltage greater than the first supply voltage and wherein the power supply voltage is generated by a configurable charge pump power supply. The control circuit may be configured to predict, based on one or more characteristics of a signal indicative of the output signal, an occurrence of a condition for changing the power supply voltage, and responsive to predicting the occurrence of the condition, change, at an approximate zero crossing of the signal indicative of the output signal, the power supply voltage.
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公开(公告)号：US20180098149A1
公开(公告)日：2018-04-05
申请号：US15286289
申请日：2016-10-05
Inventor： Tejasvi DAS , Ku HE , John L. MELANSON
CPC classification number: H04R3/04 , H03F3/187 , H03F3/45475 , H03F3/45596 , H03F2200/78 , H03F2203/45048 , H03F2203/45522 , H03G3/04 , H03G3/3005 , H03G3/3089 , H03G3/32 , H03G7/002 , H03G7/007 , H04R2430/03
Abstract: An analog signal path portion of a signal path may have: (i) an audio input for receiving an analog signal, an audio output for providing an output signal, and a selectable analog gain, and may be configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain; and (ii) a digital path portion having a selectable digital gain and configured to receive a digital input signal and convert the digital input signal into the analog signal in conformity with the selectable digital gain. A control circuit may be configured to modify the digital and analog gains in response to an indication to switch between gain modes of the signal path, determine a noise floor of an audio signal comprising the digital input signal or a signal derived therefrom, and control modification of the digital and analog gains based on the noise floor.
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公开(公告)号：US20170310288A1
公开(公告)日：2017-10-26
申请号：US15136548
申请日：2016-04-22
Inventor： Tejasvi DAS , John L. MELANSON , Eric J. KING
IPC: H03F3/183 , H03K5/1536 , H03F3/217 , H04R3/00
CPC classification number: H03F3/183 , H03F1/0222 , H03F1/025 , H03F1/305 , H03F3/187 , H03F3/2175 , H03F2200/03 , H03F2200/102 , H03F2200/228 , H03F2200/321 , H03F2200/471 , H03F2200/48 , H03F2200/504 , H03F2200/511 , H03F2200/78 , H03K5/1536 , H04R3/007
Abstract: An audio amplifier circuit for providing an output signal to an audio transducer may include a power amplifier and a control circuit. The power amplifier may include an audio input for receiving an audio input signal, an audio output for generating the output signal based on the audio input signal, and a power supply input for receiving a power supply voltage, wherein the power supply voltage is variable among at least a first supply voltage and a second supply voltage greater than the first supply voltage. The control circuit may be configured to predict, based on one or more characteristics of a signal indicative of the output signal, an occurrence of a condition for changing the power supply voltage, and responsive to predicting the occurrence of the condition, change, at an approximate zero crossing of the signal indicative of the output signal, the power supply voltage.
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Patent Agency Ranking
公开(公告)号：US20230252865A1
公开(公告)日：2023-08-10
申请号：US17726920
申请日：2022-04-22
Inventor： Siddharth MARU , Tejasvi DAS
Abstract: A system may include driving circuitry configured to drive a driving signal to an output transducer, sensing circuitry configured to sense a physical quantity associated with the output transducer in response to the driving signal, and interference detection circuitry configured to detect the presence of interference of the system and mitigate the effect of the interference in the system.
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公开(公告)号：US20230146592A1
公开(公告)日：2023-05-11
申请号：US17729626
申请日：2022-04-26
Inventor： Chandra B. PRAKASH , Tejasvi DAS , Cory J. PETERSON , Siddharth MARU
CPC classification number: H03F3/2173 , H03F3/213 , H03M1/12
Abstract: Circuitry for driving a load, the circuitry comprising: driver circuitry; and load sensing circuitry, 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, wherein the circuitry is configured to, in response to a request for operation of the circuitry in the load sensing mode: compare an indication of a current through the load to a predefined threshold; and if the indication of the current through the load meets the predefined threshold, prevent or delay operation in the load sensing mode.
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公开(公告)号：US20230082721A1
公开(公告)日：2023-03-16
申请号：US17980429
申请日：2022-11-03
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：US20230043516A1
公开(公告)日：2023-02-09
申请号：US17968565
申请日：2022-10-18
Inventor： Josh SANZ-ROBINSON , Siddharth MARU , Tejasvi DAS
Abstract: A correction unit for use in a sensor system, the sensor system comprising a force sensor configured to output a sensor signal indicative of a temporary mechanical distortion of a material under an applied force, the correction unit configured, based on the sensor signal, to: estimate an effect of the applied force on how the material will return towards an undistorted form upon a substantial reduction or removal of the applied force; and generate a corrected signal based on the estimation.
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公开(公告)号：US20220307867A1
公开(公告)日：2022-09-29
申请号：US17215157
申请日：2021-03-29
Inventor： Tejasvi DAS , Siddharth MARU , John L. MELANSON
IPC: G01D5/20
Abstract: A system may include a resistive-inductive-capacitive sensor configured to sense a physical quantity, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure one or more resonance parameters associated with the resistive-inductive-capacitive sensor and indicative of the physical quantity and, in order to maximize dynamic range in determining the physical quantity from the one or more resonance parameters, dynamically modify, across the dynamic range, either of reliance on the one or more resonance parameters in determining the physical quantity or one or more resonance properties of the resistive-inductive-capacitive sensor.
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