公开(公告)号：US20200292602A1

公开(公告)日：2020-09-17

申请号：US16890727

申请日：2020-06-02

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Amar VELLANKI ,  Zhong YOU ,  Johann G. GABORIAU

IPC: G01R27/26 ,  H04R29/00

Abstract: A method for measuring a capacitive sensor output may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal, demodulating the modulated signal to generate an intermediate signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal, converting the intermediate signal into a pulse-density modulated output signal with a pulse-density modulator, and shaping a noise transfer function of the pulse-density modulator to have an approximate zero at the carrier frequency.

公开(公告)号：US20200225786A1

公开(公告)日：2020-07-16

申请号：US16831323

申请日：2020-03-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Tejasvi DAS ,  Luke LAPOINTE ,  Srdjan MARIJANOVIC ,  Zhong YOU ,  Drew KINNEY ,  Anthony S. DOY ,  Eric J. KING

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

Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, 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 driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.

公开(公告)号：US20190285438A1

公开(公告)日：2019-09-19

申请号：US16354449

申请日：2019-03-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Mengde WANG ,  Zhong YOU

IPC: G01D5/24

Abstract: Embodiments described herein relate to methods and apparatus for separating an interference signal from a carrier signal for sensing a capacitance of a capacitive sensor. An analog front end, AFE, circuit for a capacitive sensor comprises an input configured to receive an input signal from the capacitive sensor, wherein the input signal comprises a carrier signal and an interference signal; a first signal path between the input and an output configured to output an output signal, wherein the first signal path is configured with a first impedance at a frequency of the interference signal; and a second signal path coupled to the input, wherein the second signal path is configured with a second impedance at the frequency of the interference signal, wherein the second impedance is lower than the first impedance so as to reduce a voltage swing caused by the interference signal at the input.

公开(公告)号：US20210124444A1

公开(公告)日：2021-04-29

申请号：US17142484

申请日：2021-01-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Tejasvi DAS ,  Luke LAPOINTE ,  Srdjan MARIJANOVIC ,  Zhong YOU ,  Drew KINNEY ,  Anthony S. DOY ,  Eric J. KING

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

Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, 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 driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.

公开(公告)号：US20200064160A1

公开(公告)日：2020-02-27

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

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：US20190302923A1

公开(公告)日：2019-10-03

申请号：US16294311

申请日：2019-03-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Tejasvi DAS ,  Luke LAPOINTE ,  Srdjan MARIJANOVIC ,  Zhong YOU ,  Drew KINNEY ,  Anthony S. DOY ,  Eric J. KING

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 at a plurality of periodic intervals, 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 driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.

公开(公告)号：US20230366747A1

公开(公告)日：2023-11-16

申请号：US18191733

申请日：2023-03-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Vamsikrishna PARUPALLI ,  Zhong YOU ,  Johann G. GABORIAU ,  Amar VELLANKI ,  Vikrant ARUMUGAM

IPC: G01K7/22 ,  H03M1/10

CPC classification number: G01K7/22 ,  H03M1/1014 ,  G01K2219/00

Abstract: A current digital-to-analog converter may be used in a system for measuring temperature of a thermistor, with mismatch reduction techniques applied to digital-to-analog converter elements of the digital-to-analog converter in order to maximize accuracy and precisions of the temperature measurement.

公开(公告)号：US20200278753A1

公开(公告)日：2020-09-03

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: G06F3/01 ,  G06F3/041 ,  G06F3/044 ,  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：US20190302922A1

公开(公告)日：2019-10-03

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 ,  G06F3/041 ,  G06F3/045

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：US20190302161A1

公开(公告)日：2019-10-03

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

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.