Cirrus Logic Inc.

Maxim Integrated Products, Inc.

Cirrus Logic International Semiconductor Limited

Anthony Stephen Doy

Eric Jerome King

John L Melanson

Tejasvi Das

Siddharth Maru

Carl Lennart Ståhl

Axel Thomsen

Zhong You

Thomas H Hoff

Luke Lapointe

Drew Kinney

Emmanuel A Marchais

Matthew Beardsworth

Srdjan Marijanovic

Bruce Eliot Duewer

Vadim A Konradi

Rong Hu

Vivek Prakash Nigam

Nermin Osmanovic

Harsha Rao

Teemu Ramo

Michael Allan Kost

Jeffrey Donald Alderson

Xin Zhao

Eric Lindemann

Jie Su

Thomas Ivan Harvey

Ning Li

Robert Polleros

Itisha Tyagi

Anthony John Shilton

Ziyan Zou

Kaichow Lau

Patrick Muggler

Nicholas Roche

George E Hardy

John Paul Lesso

Pirooz Parvarandeh

Christian Larsen

Christopher Francis Edwards

Jeffrey Allen May

Michael Allen Kost

Craig A Easson

Jason Lee Wardlaw

Thomas Lorenz

Carl L Ståhl

Robert G Kratsas

Jason L Wardlaw

Madhavprasad V Kolluri

Todd D Moore

Yadong Wang

Sang Youl Choi

Jonathan Chien

Srdjan Marjianovic

Vadim Konradi

Carl Lennart STÅHL

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.

Single-capacitor inductive sense systems

A method may include forming an inductor comprising a plurality of inductor coils comprising a plurality of first inductor coils and a plurality of second inductor coils, each inductor coil comprising a spiraling wire of electrically-conductive material wherein the wire of electrically-conductive material is arranged substantially in a plane, wherein the plurality of first inductor coils and the plurality of second inductor coils are electrically coupled to one another and arranged with respect to one another such that within the plane, electrical current flowing through the inductor flows clockwise in the first inductor coils, within the plane, electrical current flowing through the inductor flows counterclockwise in the second inductor coils, each first inductor coil is adjacent to at least one second inductor coil, and each second inductor coil is adjacent to at least one first inductor coil.

Far field interference cancellation for resistive-inductive-capacitive sensors

This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.

Driver circuitry and operation

Embodiments described herein relate to methods and apparatus for outputting a haptic signal to a haptic transducer. A method for triggering a haptic signal being output to a haptic transducer comprises receiving an audio signal for output through an audio output transducer; determining whether the audio signal comprises a haptic trigger based on an indication of a rate of change of an amplitude of the audio signal, and responsive to determining that the audio signal comprises a haptic trigger, triggering the haptic signal to be output to the haptic transducer.

Methods and apparatus for outputting a haptic signal to a haptic transducer

The present disclosure relates to circuitry for driving a piezoelectric transducer to generate an audio output. The circuitry comprises pre-processor circuitry configured to process an input audio signal to generate a processed signal; driver circuitry coupled to the pre-processor circuitry and configured to generate a drive signal, based on the processed signal, for driving the piezoelectric transducer; and processor circuitry configured to determine a resonant frequency of the piezoelectric transducer. The pre-processor circuitry is configured to process the input audio signal based on the determined resonant frequency so as to generate the processed signal.

Driver circuitry

The application describes a switched driver () for outputting a drive signal at an output node () to drive a load such as a transducer. The driver receives respective high-side and low-side voltages (VinH, VinL) defining an input voltage at first and second input nodes and has connections for first and second capacitors (H,L). A network of switching paths is configured such that each of the first and second capacitors can be selectively charged to the input voltage, the first input node can be selectively coupled to a first node (N) by a path that include or bypass the first capacitor, and the second input node can be selectively coupled to a second node (N) by a path that includes or bypasses the second capacitor. The output node () can be switched between two switching voltages at the first or second nodes. The driver is selectively operable in different operating modes, where the switching voltages are different in each of said modes.

Driver circuits

An integrated haptic system may include a digital signal processor and an amplifier communicatively coupled to the digital signal processor and integrated with the digital signal processor into the integrated haptic system. The digital signal processor may be configured to receive a force sensor signal indicative of a force applied to a force sensor and generate a haptic playback signal responsive to the force. The amplifier may be configured to amplify the haptic playback signal and drive a vibrational actuator communicatively coupled to the amplifier with the haptic playback signal as amplified by the amplifier.

Integrated haptic system

The application describes systems for deriving haptic and audio drive signals from an input signal received via a single channel such as an audio channel.

Haptic output systems

A touch-sensitive user input device comprising: a first electrode layer comprising a first plurality of electrodes; a second electrode layer comprising a second plurality of electrodes; an insulating layer disposed between the first electrode layer and the second electrode layer; and at least one piezoelectric transducer, wherein an electrode of the at least one piezoelectric transducer is coupled to the first plurality of electrodes of the first electrode layer.

User input device having piezoelectric transducer electrode coupled to touch electrodes

A system may include an electromagnetic load capable of generating a haptic event and a haptic processor configured to receive at least one first parameter indicative of a desired perception of the haptic event to a user of a device comprising the electromagnetic load, receive at least one second parameter indicative of one or more characteristics of the device, and process the at least one first parameter and the at least one second parameter to generate a driving signal to the electromagnetic load in order to produce the desired perception to the user despite variances in the device that cause an actual perception of the haptic event to vary from the desired perception.

Reproducibility of haptic waveform

A system may include at least one resistive-inductive-capacitive sensor and a control circuit configured to maintain timing parameters for operation of the at least one resistive-inductive-capacitive sensor and vary at least one of the timing parameters to control a spectrum associated with the at least one resistive-inductive-capacitive sensor, wherein the spectrum comprises one of a sensor activity spectrum of the at least one resistive-inductive-capacitive sensor and a current usage spectrum associated with electrical current delivered to the at least one resistive-inductive-capacitive sensor from a source of electrical energy.

Spread spectrum sensor scanning using resistive-inductive-capacitive sensors

This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.

Driver circuitry for driving an electromechanical load with a drive output signal, the driver circuitry comprising: a first control loop operable to control the drive output signal based on a drive input signal; and a second control loop operable to control the drive output signal based on a current flowing through and/or a voltage induced across the electromechanical load, wherein the second control loop is configured to have a lower latency than the first control loop, and to control the drive output signal to compensate for an impedance of the electromechanical load.

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Los Gatos, CA, United States of America

Anthony Stephen Doy