公开(公告)号：US11079874B2

公开(公告)日：2021-08-03

申请号：US16867223

申请日：2020-05-05

Applicant: Cirrus Logic International Semiconductor Ltd.

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.

公开(公告)号：US11016572B2

公开(公告)日：2021-05-25

申请号：US16875006

申请日：2020-05-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Srdjan Marijanovic ,  Drew Kinney ,  Luke Lapointe ,  Siddharth Maru ,  Tejasvi Das ,  Anthony S. Doy ,  Zhong You

IPC: G06F3/044 ,  G06F3/01 ,  G06F3/041 ,  G06F3/045 ,  G01D5/20 ,  G01D5/243

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.

公开(公告)号：US10461640B2

公开(公告)日：2019-10-29

申请号：US15283839

申请日：2016-10-03

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. King ,  Siddharth Maru ,  John L. Melanson

IPC: H02M1/00 ,  H02M3/158 ,  H02M1/088 ,  H02M1/084 ,  H02M1/10 ,  H02J7/34

Abstract: An apparatus may include a power converter having a power supply input for receiving an input power supply voltage generated by a power supply, an output for generating an output voltage to a load, and a power inductor coupled between the power supply input and the output may and further include an energy storage element coupled to the power supply input, the power inductor, and the output such that operation of the power inductor is split temporally between delivering energy to the energy storage element and delivering energy to the load, and operation of the energy storage element is split temporally between delivering energy to the load and receiving energy from one or both of the power supply and the load.

公开(公告)号：US10090814B2

公开(公告)日：2018-10-02

申请号：US15270687

申请日：2016-09-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John L. Melanson ,  Eric J. King ,  Zhaohui He ,  Siddharth Maru

IPC: H03F3/217 ,  H03F3/187 ,  H04R3/02

Abstract: A signal processing system for producing a load voltage at a load output of the signal processing system, wherein the load output comprises a first load terminal having a first load voltage and a second load terminal having a second load voltage such that the load voltage comprises a difference between the first load voltage and the second load voltage, and may include a first processing path configured to process a first signal derived from an input signal to generate the first load voltage at a first processing path output, a second processing path configured to process a second signal received at a second processing path input and derived from the input signal, wherein the second signal comprises information of the input signal absent from the first signal, to generate the second load voltage at a second processing path output, and a high-pass filter coupled between the first processing path output and the second processing path input.

公开(公告)号：US12130647B2

公开(公告)日：2024-10-29

申请号：US17508204

申请日：2021-10-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Siddharth Maru ,  Cory J. Peterson

IPC: G05F1/56 ,  G01R19/00 ,  G01R27/16

CPC classification number: G05F1/56 ,  G01R19/0092 ,  G01R27/16

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.

公开(公告)号：US12130159B2

公开(公告)日：2024-10-29

申请号：US16532850

申请日：2019-08-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth Maru ,  Tejasvi Das ,  Zhong You ,  Johann G. Gaboriau ,  Matthew Beardsworth ,  Gregory C. Yancey

IPC: G01D5/243 ,  G01D5/14 ,  G01D5/16 ,  G01D5/20 ,  G01D5/24 ,  G06F3/01 ,  H03K17/95

CPC classification number: G01D5/243 ,  G01D5/14 ,  G01D5/16 ,  G01D5/20 ,  G01D5/24 ,  G06F3/01 ,  H03K17/9522 ,  H03K17/9537

Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor, and a filter communicatively coupled to the measurement circuit. The measurement circuit may be 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 filter may be configured to isolate changes to the displacement which are significantly slower than an expected change to the displacement in response to a human interaction with the mechanical member.

公开(公告)号：US11947756B2

公开(公告)日：2024-04-02

申请号：US17968565

申请日：2022-10-18

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Josh Sanz-Robinson ,  Siddharth Maru ,  Tejasvi Das

IPC: G06F3/041 ,  G06F3/02 ,  G06F3/01

CPC classification number: G06F3/0418 ,  G06F3/02 ,  G06F3/0414 ,  G06F3/016

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.

公开(公告)号：US11835410B2

公开(公告)日：2023-12-05

申请号：US17079709

申请日：2020-10-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Michael A. Kost ,  Tejasvi Das ,  Marc J. Kobayashi ,  Siddharth Maru ,  Rahul Gawde

IPC: G01L27/00 ,  G01L1/16 ,  G06F3/041 ,  G01L1/14 ,  G01L1/22

CPC classification number: G01L27/00 ,  G01L1/142 ,  G01L1/16 ,  G01L1/22 ,  G06F3/0414

Abstract: A method for determining sensor parameters of an actively-driven sensor system may include performing an initialization operation to establish a baseline estimate of the sensor parameters, obtaining as few as three samples of a measured physical quantity versus frequency for the actively-driven sensor system, performing a refinement operation to provide a refined version of the sensor parameters based on the as few as three samples, iteratively repeating the refinement operation until the difference between successive refined versions of the sensor parameters is below a defined threshold, and outputting the refined sensor parameters as updated sensor parameters for the actively-driven sensor system.

公开(公告)号：US11808669B2

公开(公告)日：2023-11-07

申请号：US17215117

申请日：2021-03-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Siddharth Maru ,  John L Melanson

IPC: H03B21/00 ,  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.

公开(公告)号：US11714113B2

公开(公告)日：2023-08-01

申请号：US17894429

申请日：2022-08-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth Maru ,  Vadim Konradi ,  Matthew Beardsworth ,  Tejasvi Das

IPC: G01R27/28 ,  G01D5/243

CPC classification number: G01R27/28 ,  G01D5/243

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.