Patents by Inventor Tejasvi Das

Tejasvi Das has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11536758
    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.
    Type: Grant
    Filed: July 19, 2019
    Date of Patent: December 27, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason L. Wardlaw, Michael A. Kost, Anthony S. Doy, Tejasvi Das, Siddharth Maru, Xin Zhao, Matthew Beardsworth, Bruce E. Duewer
  • Patent number: 11537242
    Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to 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 Q factor enhancer communicatively coupled to the resistive-inductive-capacitive sensor and configured to control a Q factor of the resistive-inductive-capacitive sensor.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: December 27, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Tejasvi Das, Siddharth Maru, Zhong You, Luke Lapointe
  • Publication number: 20220404409
    Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to determine a measured change in a resonant frequency of the resistive-inductive-capacitive sensor and based on the measured change, modify the driving frequency.
    Type: Application
    Filed: August 24, 2022
    Publication date: December 22, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Siddharth MARU, Vadim KONRADI, Matthew BEARDSWORTH, Tejasvi DAS
  • Patent number: 11520436
    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.
    Type: Grant
    Filed: November 13, 2020
    Date of Patent: December 6, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Josh Sanz-Robinson, Siddharth Maru, Tejasvi Das
  • Patent number: 11522509
    Abstract: 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.
    Type: Grant
    Filed: March 8, 2021
    Date of Patent: December 6, 2022
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Xin Zhao, Tejasvi Das, Xiaofan Fei
  • Patent number: 11507267
    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.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: November 22, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Hamid Sepehr, Pablo Peso Parada, Willem Zwart, Tom Birchall, Michael Allen Kost, Tejasvi Das, Siddharth Maru, Matthew Beardsworth, Bruce E. Duewer
  • Publication number: 20220357757
    Abstract: The present disclosure relates to circuitry for driving a load. The circuitry comprises: primary driver circuitry coupled to a primary signal path and operable to drive the load with a playback signal in a first mode of operation of the circuitry, wherein a playback signal comprises a signal that drives the load to generate a desired output; auxiliary driver circuitry coupled to an auxiliary signal path; an auxiliary current sense resistor in the auxiliary signal path; and current detection circuitry coupled to the auxiliary current sense resistor and configured to generate a signal indicative of a current through the load. One of the primary driver circuitry and the auxiliary driver circuitry is operable to drive the load with a pilot signal in a second mode of operation of the circuitry, wherein a pilot signal comprises a signal having a predefined frequency or frequency content and a predefined magnitude.
    Type: Application
    Filed: October 22, 2021
    Publication date: November 10, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tejasvi DAS, Siddharth MARU, Cory J. PETERSON
  • Publication number: 20220359113
    Abstract: A system may include an electromagnetic actuator, a first coil configured to drive mechanical displacement of the electromagnetic actuator, a second coil configured to drive mechanical displacement of the electromagnetic actuator, and an inductance sensing subsystem having an inductance sensing path coupled to the first coil and the second coil.
    Type: Application
    Filed: January 4, 2022
    Publication date: November 10, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Emmanuel A. MARCHAIS, Tejasvi DAS, Siddharth MARU
  • Publication number: 20220337235
    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.
    Type: Application
    Filed: June 23, 2022
    Publication date: October 20, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Matthew BEARDSWORTH, Tejasvi DAS, Siddharth MARU, Luke LAPOINTE
  • Patent number: 11474135
    Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to determine a measured change in a resonant frequency of the resistive-inductive-capacitive sensor and based on the measured change, modify the driving frequency.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: October 18, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Siddharth Maru, Vadim Konradi, Matthew Beardsworth, Tejasvi Das
  • Publication number: 20220307872
    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.
    Type: Application
    Filed: March 24, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Siddharth MARU, Josh SANZ-ROBINSON, Tejasvi DAS, John L. MELANSON
  • Publication number: 20220308000
    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.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tejasvi DAS, Siddharth MARU, John L. MELANSON
  • Publication number: 20220307867
    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.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tejasvi DAS, Siddharth MARU, John L. MELANSON
  • Patent number: 11451215
    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.
    Type: Grant
    Filed: June 9, 2021
    Date of Patent: September 20, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Miao Song, Xin Zhao, Tejasvi Das, Jason Wardlaw, Michael A. Kost
  • Publication number: 20220286098
    Abstract: 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.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 8, 2022
    Inventors: Xin Zhao, Tejasvi Das, Xiaofan Fei
  • Patent number: 11431310
    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.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: August 30, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Amar Vellanki, Tejasvi Das, John L. Melanson
  • Patent number: 11418184
    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.
    Type: Grant
    Filed: October 5, 2021
    Date of Patent: August 16, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Matthew Beardsworth, Tejasvi Das, Siddharth Maru, Luke Lapointe
  • Publication number: 20220252428
    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.
    Type: Application
    Filed: February 8, 2021
    Publication date: August 11, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Luke LAPOINTE, Siddharth MARU, Tejasvi DAS
  • Patent number: 11402946
    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.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: August 2, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Bruce E. Duewer, Michael A. Kost, Matthew Beardsworth, Tejasvi Das, Siddharth Maru
  • Patent number: 11366550
    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.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: June 21, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Bruce E. Duewer, Michael A. Kost, Matthew Beardsworth, Tejasvi Das, Siddharth Maru