公开(公告)号：US20200319237A1

公开(公告)日：2020-10-08

申请号：US16600255

申请日：2019-10-11

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth MARU ,  Vadim KONRADI ,  Matthew BEARDSWORTH ,  Tejasvi DAS

IPC: 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：US20200272301A1

公开(公告)日：2020-08-27

申请号：US16457489

申请日：2019-06-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Bruce E. DUEWER ,  Michael A. KOST ,  Matthew BEARDSWORTH ,  Tejasvi DAS ,  Siddharth MARU

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/045 ,  H04J3/06

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.

公开(公告)号：US20200271706A1

公开(公告)日：2020-08-27

申请号：US16517046

申请日：2019-07-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason L. WARDLAW ,  Michael A. KOST ,  Anthony S. DOY ,  Tejasvi DAS ,  Siddharth MARU ,  Xin ZHAO ,  Matthew BEARDSWORTH ,  Bruce E. DUEWER

IPC: G01R27/28 ,  G01L9/00 ,  G01H13/00 ,  G01R27/26

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.

公开(公告)号：US20200133455A1

公开(公告)日：2020-04-30

申请号：US16422543

申请日：2019-05-24

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

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：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：US20170272043A1

公开(公告)日：2017-09-21

申请号：US15285038

申请日：2016-10-04

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. KING ,  Mars HE ,  John L. MELANSON ,  Siddharth MARU

IPC: H03F3/217 ,  H03F1/02 ,  H04R3/12 ,  H03F3/185

CPC classification number: H03F3/2171 ,  H02M5/293 ,  H02M2005/2932 ,  H03F1/0216 ,  H03F1/0227 ,  H03F1/32 ,  H03F3/185 ,  H03F3/2173 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/153 ,  H03F2200/432 ,  H04R3/12

Abstract: A method may include processing a first signal derived from an input signal with a first path to generate a first path voltage at a first path output, processing a second signal derived from the input signal with a second path to generate a second path voltage at a second path output, the second path comprising a linear amplifier having at least one transistor for driving the second path voltage, generating the first signal and the second signal with a signal splitter, such that the second signal comprises information of the input signal absent from the first signal, and such that the second path voltage is of a sufficient magnitude such that the at least one transistor operates in a saturation region of the at least one transistor throughout a dynamic range of a load voltage equal to the difference of the first path voltage and the second path voltage.

公开(公告)号：US20170141675A1

公开(公告)日：2017-05-18

申请号：US15340151

申请日：2016-11-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. KING ,  John L. MELANSON ,  Siddharth MARU

IPC: H02M1/084 ,  H02M3/158

Abstract: In accordance with embodiments of the present disclosure, an apparatus may include a switched-mode power supply and a controller. The switched-mode power supply may include an inductor and a plurality of switches coupled to the inductor. The controller may be configured to control an inductor current of the inductor by controlling the plurality of switches to operate the switched-mode power supply in at least three phases, the at least three phases comprising: a first phase having a first period in which the inductor current increases; and a second phase having a second period in which the inductor current decreases; wherein, at least one of the first period and the second period is defined by a difference in time between switching of at least two switches of the plurality of switches.