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.

公开(公告)号：US11537242B2

公开(公告)日：2022-12-27

申请号：US16294217

申请日：2019-03-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Siddharth Maru ,  Zhong You ,  Luke Lapointe

IPC: G06F3/044 ,  G06F3/045 ,  G06F3/041

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.

公开(公告)号：US11269509B2

公开(公告)日：2022-03-08

申请号：US17076489

申请日：2020-10-21

Applicant: Cirrus Logic International Semiconductor Ltd.

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 ,  G01L5/162 ,  G01L5/165 ,  G01L5/167 ,  G01L5/164

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.

公开(公告)号：US11255892B2

公开(公告)日：2022-02-22

申请号：US16658755

申请日：2019-10-21

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Siddharth Maru ,  Xin Zhao ,  Matthew Beardsworth ,  Michael A. Kost ,  John L. Melanson

IPC: G01R29/18

Abstract: A system may include a sensor having a variable phase response, a dummy impedance having a known phase response, and a measurement circuit communicatively coupled to the sensor and configured to measure first phase information associated with the sensor, measure second phase information associated with the dummy impedance, and determine a phase response of the measurement circuit based on a comparison of the first phase information to the second phase information.

公开(公告)号：US11190168B2

公开(公告)日：2021-11-30

申请号：US16784392

申请日：2020-02-07

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jing Bai ,  Tejasvi Das ,  Xin Zhao ,  Lei Zhu ,  Xiaofan Fei

IPC: H03K17/687 ,  H03K3/01 ,  H03K19/0185 ,  H03K19/0175 ,  H04R3/00

Abstract: A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and a low-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a first resistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.

公开(公告)号：US11070203B2

公开(公告)日：2021-07-20

申请号：US16162960

申请日：2018-10-17

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jing Bai ,  Tejasvi Das ,  Xin Zhao ,  Lei Zhu ,  Xiaofan Fei

IPC: H03K17/687 ,  G06F3/01 ,  H03K17/06 ,  H03K19/0175 ,  H03K19/0185 ,  H03F3/217 ,  H03F3/183 ,  H04R3/12

Abstract: A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and a low-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a first resistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.

公开(公告)号：US10935620B2

公开(公告)日：2021-03-02

申请号：US16455437

申请日：2019-06-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Siddharth Maru ,  Matthew Beardsworth ,  Bruce E. Duewer ,  Michael A. Kost

IPC: G01R35/00 ,  G01R23/02 ,  G01R27/02 ,  G06F3/041

Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor with a driving signal at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to, during a calibration phase of the measurement circuit, measure phase and amplitude information associated with the resistive-inductive-capacitive sensor and based on the phase and amplitude information, determine at least one of a resonant frequency of the resistive-inductive-capacitive sensor and a transfer function of the resistive-inductive-capacitive sensor.

公开(公告)号：US10908200B2

公开(公告)日：2021-02-02

申请号：US16267079

申请日：2019-02-04

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Zhong You ,  Siddharth Maru ,  Tejasvi Das ,  Luke Lapointe ,  Eric J. King ,  Anthony S. Doy ,  Srdjan Marjianovic ,  Drew Kinney ,  Matthew Beardsworth ,  Emmanuel Marchais

IPC: G01R27/26 ,  G01R27/02 ,  G01D5/20 ,  G01D5/243 ,  G01R27/28 ,  G01R31/26 ,  G01R31/64 ,  G01R17/16 ,  G01R21/07

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 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, wherein the displacement of the mechanical member causes a change in an impedance of the resistive-inductive-capacitive sensor.

公开(公告)号：US10833657B2

公开(公告)日：2020-11-10

申请号：US16181792

申请日：2018-11-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  Johann G. Gaboriau

IPC: H03K3/017 ,  H03K3/011 ,  H03G3/30 ,  H04R3/00 ,  H03F3/183

Abstract: In accordance with embodiments of the present disclosure, an apparatus may include a signal path comprising a closed-loop analog pulse width modulator having a forward signal path and a feedback path, a variable resistor coupled to an output of the closed-loop analog pulse width modulator, and a control circuit configured to modify the variable resistor in order to modify an output impedance outside of the feedback path of the closed-loop analog pulse width modulator responsive to a condition for switching between a high output impedance mode and a low output impedance mode of the closed-loop analog pulse width modulator or vice versa.

公开(公告)号：US10020778B1

公开(公告)日：2018-07-10

申请号：US15651314

申请日：2017-07-17

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson

IPC: H03F3/38 ,  H03F1/02 ,  H03F3/217 ,  H03F3/185 ,  H04R3/04

CPC classification number: H03F1/0205 ,  H03F1/0272 ,  H03F1/0277 ,  H03F3/185 ,  H03F3/187 ,  H03F3/2171 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/432 ,  H04R3/04

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.