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：US20200314969A1

公开(公告)日：2020-10-01

申请号：US16556849

申请日：2019-08-30

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Emmanuel MARCHAIS ,  Zhong You

IPC: H05B6/04 ,  H02M7/48 ,  G08B6/00

Abstract: A resonant frequency tracker for driving an electromagnetic load with a driving signal may include a signal generator configured to generate a waveform signal at a driving frequency for driving an electromagnetic load and control circuitry. The control circuitry may be configured to, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receive a current signal representative of a current associated with the electromagnetic load and a second signal representative of a second quantity associated with the electromagnetic load, the second quantity comprising one of a voltage associated with the electromagnetic load or a back electromotive force of the electromagnetic load. The control circuitry may be further configured to calculate a phase difference between the current signal and the second signal, determine a frequency error of the waveform signal based on the phase difference, and control the driving frequency based on the frequency error.

公开(公告)号：US10718801B2

公开(公告)日：2020-07-21

申请号：US15926734

申请日：2018-03-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Amar Vellanki ,  Zhong You ,  Johann G. Gaboriau

IPC: G01R27/26 ,  H04R29/00 ,  H04R3/00

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.