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11.发明申请公开(公告)号：US20200044616A1
公开(公告)日：2020-02-06
申请号：US16190427
申请日：2018-11-14
Inventor： Tejasvi DAS , Eric J. KING , Xin ZHAO , Xiaofan FEI , Johann G. GABORIAU , Lei ZHU , John L. MELANSON , Thomas HOFF
Abstract: A system may include a digital modulator configured to modulate an input signal received at an input of the digital modulator to generate a modulated input signal at an output of the digital modulator, a digital gain element having a digital gain and coupled to the digital modulator, an open-loop Class-D amplifier coupled to an output of the digital modulator and configured to amplify the modulated input signal, wherein the open-loop Class-D amplifier is powered from a variable power supply having a variable supply voltage which is variable in response to one or more characteristics of the input signal, and a control circuit configured to control the digital gain to approximately cancel changes in an analog gain of the open-loop Class-D amplifier due to variation in the variable supply voltage in response to the one or more characteristics of the input signal.
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公开(公告)号：US20180316525A1
公开(公告)日：2018-11-01
申请号：US15926395
申请日：2018-03-20
Inventor： Pradeep DHANANJAY , Tejasvi DAS , Bhupendra MANOLA , Bruce E. DUEWER
Abstract: An apparatus for generating an output signal, may comprise a signal path having an analog signal path portion having an analog magnitude droop, a digital signal path portion having a digital magnitude droop, a digital-to-analog converter for converting the digital input signal into the analog signal, a first digital compensation filter that compensates for the analog magnitude droop, and a second digital compensation filter that compensates for the digital magnitude droop, such that the first digital compensation filter and the second digital compensation filter together compensate for magnitude droop of the signal path to ensure a substantially flat passband response of the signal path.An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized
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公开(公告)号：US20180159488A1
公开(公告)日：2018-06-07
申请号：US15884912
申请日：2018-01-31
Inventor： Xin ZHAO , Tejasvi DAS , Xiaofan FEI , Alan Mark MORTON
CPC classification number: H03F3/2171 , H03F1/32 , H03F1/342 , H03F3/181 , H03F3/187 , H03F3/217 , H03F3/2173 , H03F3/38 , H03F3/72 , H03F2200/345 , H03F2200/351
Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Structure of the feedback network and the first stage may remain static when switching between modes.
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公开(公告)号：US20240060920A1
公开(公告)日：2024-02-22
申请号：US18470066
申请日：2023-09-19
Inventor： Tejasvi DAS , Siddharth MARU , John L. MELANSON
IPC: G01N27/02
CPC classification number: G01N27/025 , G01N27/028
Abstract: 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：US20230052112A1
公开(公告)日：2023-02-16
申请号：US17962086
申请日：2022-10-07
Inventor： Hamid SEPEHR , Pablo PESO PARADA , Willem ZWART , Tom BIRCHALL , Michael Allen KOST , Tejasvi DAS , Siddharth MARU , Matthew BEARDSWORTH , Bruce E. DUEWER
IPC: G06F3/0488 , G06F3/041
Abstract: 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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Patent Agency Ranking
公开(公告)号：US20210396610A1
公开(公告)日：2021-12-23
申请号：US17080455
申请日：2020-10-26
Inventor： Junsong LI , Rahul GAWDE , Tejasvi DAS , Siddharth MARU , Eric B. SMITH
IPC: G01L1/26
Abstract: A control method for a user interface system may include receiving an input signal, receiving a temperature signal indicative of a temperature, generating a baseline signal based on at least one among the input signal and the temperature signal, calculating an error signal based on a difference of the input signal and the baseline signal, and modifying the baseline signal based on the error signal.
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公开(公告)号：US20210034213A1
公开(公告)日：2021-02-04
申请号：US17076489
申请日：2020-10-21
Inventor： Hamid SEPEHR , Pablo PESO PARADA , Willem ZWART , Tom BIRCHALL , Michael Allen KOST , Tejasvi DAS , Siddharth MARU , Matthew BEARDSWORTH , Bruce E. DUEWER
IPC: G06F3/0488 , G06F3/041
Abstract: 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：US20200228079A1
公开(公告)日：2020-07-16
申请号：US16828401
申请日：2020-03-24
Inventor： Amar VELLANKI , Tejasvi DAS , John L. MELANSON
Abstract: A multi-path subsystem may include a first processing path, a second processing path, a mixed signal return path, and a calibration engine configured to: estimate and cancel a direct current (DC) offset of the mixed signal return path, estimate and cancel a DC offset between the first processing path and the second processing path, estimate and cancel a phase difference between the first processing path and a sum of the second processing path and the mixed signal return path, estimate and cancel a return path gain of the mixed signal return path, and track and correct for a gain difference between the first processing path and the second processing path.
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19.发明申请公开(公告)号：US20190302890A1
公开(公告)日：2019-10-03
申请号：US16294347
申请日：2019-03-06
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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20.发明申请公开(公告)号：US20190302193A1
公开(公告)日：2019-10-03
申请号：US16354695
申请日：2019-03-15
Inventor： Siddharth MARU , Tejasvi DAS , Zhong YOU
Abstract: A system may include a resonant phase sensing system comprising a resistive-inductive-capacitive sensor and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor, and a compensation circuit. The measurement circuit may be configured to use a phase detector to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a metal plate relative to the resistive-inductive-capacitive sensor. The compensation circuit may be configured to detect a change in a physical property associated with the resistive-inductive-capacitive sensor other than the displacement and compensate the phase information to correct for the change in the physical property.
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