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公开(公告)号：US10483924B2
公开(公告)日：2019-11-19
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：US10460819B2
公开(公告)日：2019-10-29
申请号：US15365451
申请日：2016-11-30
Inventor： Ramin Zanbaghi , Tejasvi Das , John L. Melanson , Axel Thomsen
Abstract: A variable resistor may be coupled between a reference voltage source and components of an integrated circuit to reduce issues relating to thermal noise from a reference voltage signal generated by the reference voltage source. The variable resistor may be set to a low level during a first time period and a high level during a second time period, in which the time periods correspond to a sampling period of a switched-capacitor circuit. The low resistance time period may allow quick settling of an input reference voltage signal, whereas the high resistance time period may reduce a bandwidth of noise on a sampling capacitor coupled to the reference voltage signal. The variable resistor and switched-capacitor network may be used in an analog-to-digital converter (ADC), such as in audio circuits.
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公开(公告)号：US10044323B1
公开(公告)日：2018-08-07
申请号：US15651356
申请日：2017-07-17
Inventor： Ku He , Tejasvi Das , John L. Melanson
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. Control circuitry may reduce audio artifacts associated with switching between modes.
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公开(公告)号：US11669165B2
公开(公告)日：2023-06-06
申请号：US17190708
申请日：2021-03-03
Inventor： Tejasvi Das , Matthew Beardsworth , Michael A. Kost , Gavin McVeigh , Hamid Sepehr , Carl L. Ståhl
CPC classification number: G06F3/016 , B06B1/0207 , B06B1/045 , G08B6/00 , B06B2201/53
Abstract: Embodiments described herein relate to methods and apparatuses for controlling an operation of a vibrational output system and/or an operation of an input sensor system, wherein the controller is for use in a device comprising the vibrational output system and the input sensor system. A controller comprises an input configured to receive an indication of activation or de-activation of an output of the vibrational output system; and an adjustment module configured to adjust the operation of the vibrational output system and/or the operation of the input sensor system based on the indication to reduce an interference expected to be caused by the output of the vibrational output system on the input sensory system.
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25.发明授权公开(公告)号：US11644521B1
公开(公告)日：2023-05-09
申请号：US17690327
申请日：2022-03-09
Inventor： Ryan A. Hellman , Viral Parikh , Siddharth Maru , Tejasvi Das
CPC classification number: G01R35/005 , G01R1/203 , G01R19/0092 , G01R27/02 , G01R27/14 , G01R27/08 , G01R27/16
Abstract: Circuitry comprising: a voltage monitoring path; a current monitoring path; a reference element of a predefined impedance; and processing circuitry, wherein in operation of the circuitry in a calibration mode of operation: the voltage monitoring path is operative to output a signal indicative of a voltage across the reference element in response to a reference signal applied to the reference element; the current monitoring path is operative to output a signal indicative of a current through the reference element in response to the reference signal; and the processing circuitry is operative to: receive the signal indicative of the voltage across the reference element and the signal indicative of the current through the reference element; generate an estimate of an impedance of the reference element; and determine a compensation parameter for an element of the circuitry for compensating for a difference between the estimate of the impedance and the predefined impedance of the reference element.
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Patent Agency Ranking
公开(公告)号：US11579030B2
公开(公告)日：2023-02-14
申请号：US17080455
申请日：2020-10-26
Inventor： Junsong Li , Rahul Gawde , Tejasvi Das , Siddharth Maru , Eric B. Smith
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：US11451215B1
公开(公告)日：2022-09-20
申请号：US17343084
申请日：2021-06-09
Inventor： Miao Song , Xin Zhao , Tejasvi Das , Jason Wardlaw , Michael A. Kost
Abstract: A piece-wise linear (PWL) waveform generator includes a current generator that generates a reference current, an output capacitor across which an output voltage is developed to form a PWL waveform, charging and discharging current sources for charging/discharging the output capacitor based on the reference current, a clock-controlled switch network for controlling the charging/discharging of the output capacitor, and a feedback control loop that senses the output voltage and controls the current generator to vary the reference current based on the output voltage. A first switch controlled by a first clock signal periodically connects/disconnects a current source output to/from a load impedance and a second switch controlled by a second clock signal periodically connects/disconnects a capacitor to/from the current source while disconnected from the load impedance. The capacitor capacitance is based on a predetermined voltage to mitigate glitching when the first switch connects the current source output to the load impedance.
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公开(公告)号：US11366550B2
公开(公告)日：2022-06-21
申请号：US16457489
申请日：2019-06-28
Inventor： Bruce E. Duewer , Michael A. Kost , Matthew Beardsworth , Tejasvi Das , Siddharth Maru
Abstract: A system may include a plurality of actively-driven inductive sensors and a plurality of control circuits, each control circuit of the plurality of control circuits configured to control operation of a respective set of the actively-driven inductive sensors, each control circuit of the plurality of control circuits communicatively coupled to the other control circuits via a connection configured to distribute synchronization information among the plurality of control circuits. Each of the plurality of control circuits may further be configured to configure a schedule for controlling time-division multiplexed operation of its respective set of actively-driven inductive sensors and control time-division multiplexed operation of its respective set of actively-driven inductive sensors based on the schedule and the synchronization information in order to minimize interference among the plurality of actively-driven inductive sensors.
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公开(公告)号：US11171641B2
公开(公告)日：2021-11-09
申请号：US16654791
申请日：2019-10-16
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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30.发明授权公开(公告)号：US11092657B2
公开(公告)日：2021-08-17
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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