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    Driver circuitry
    3.
    发明授权
    Driver circuitry 有权

    公开(公告)号：US10828672B2

    公开(公告)日：2020-11-10

    申请号：US16369556

    申请日：2019-03-29

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Carl Lennart Ståhl ,  Emmanuel Marchais ,  Anthony Stephen Doy ,  John L. Melanson

    IPC: B06B1/02 ,  G06F3/01

    Abstract: Driver circuitry for driving an electromechanical load with a drive output signal based on a digital reference signal at a first sample rate, the drive output signal inducing a first electrical quantity at the electromechanical load, the driver circuitry comprising: a function block configured, based on said first electrical quantity, to digitally determine at a second sample rate higher than the first sample rate an adjustment signal indicative of a second electrical quantity which would be induced at a target output impedance of the driver circuitry due to said first electrical quantity; and a driver configured to generate the drive output signal based on the reference signal and the adjustment signal to cause the drive output signal to behave as if an output impedance of the driver circuitry has been adjusted to comprise the target output impedance, wherein the first electrical quantity is a current and the second electrical quantity is a voltage, or vice versa.

    Configurable control loop topology for a pulse width modulation amplifier
    6.
    发明授权
    Configurable control loop topology for a pulse width modulation amplifier 有权

    公开(公告)号：US10193505B2

    公开(公告)日：2019-01-29

    申请号：US15661446

    申请日：2017-07-27

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Emmanuel Marchais ,  Lingli Zhang ,  Eric J. King ,  Christian Larsen

    IPC: H03F3/38 ,  H03F1/32 ,  H03F3/187 ,  H03F3/217

    Abstract: In accordance with embodiments of the present disclosure, a system may have a configurable control loop technology, wherein the system comprises a first mode control loop, a second mode control loop and a reconfigurable pulse width modulator (PWM) configured to generate an output signal from an input signal. The reconfigurable PWM may include a digital PWM and an analog PWM and may be configured such that when the first mode control loop is activated, the reconfigurable PWM utilizes the analog PWM to generate the output signal from the input signal and when the second mode control loop is activated, the reconfigurable PWM utilizes the digital PWM to generate the output signal from the input signal and the digital PWM receives its input from a digital proportional integral derivative controller.

    Identifying mechanical impedance of an electromagnetic load using least-mean-squares filter
    9.
    发明授权
    Identifying mechanical impedance of an electromagnetic load using least-mean-squares filter 有权

    公开(公告)号：US11509292B2

    公开(公告)日：2022-11-22

    申请号：US16559238

    申请日：2019-09-03

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Emmanuel Marchais ,  Pablo Peso Parada ,  Eric Lindemann

    IPC: G06F13/00 ,  H03H17/06 ,  H03H7/12 ,  G06F3/01 ,  H02N2/06 ,  G01H15/00

    Abstract: A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load and, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may also include implementing an adaptive filter to identify parameters of the mechanical impedance of the electromagnetic load, wherein an input of a coefficient control for adapting coefficients of the adaptive filter is a first signal derived from the back electromotive force signal and a target of the coefficient control for adapting coefficients of the adaptive filter is a second signal derived from the current signal.

    Non linear predictive model for haptic waveform generation
    10.
    发明授权
    Non linear predictive model for haptic waveform generation 有权

    公开(公告)号：US11238709B2

    公开(公告)日：2022-02-01

    申请号：US16841113

    申请日：2020-04-06

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Emmanuel Marchais ,  Eric Lindemann ,  Carl L. Stahl

    IPC: G08B6/00 ,  G06F3/01

    Abstract: A system includes a sequencer that divides a reference waveform into reference sequences, a sequence adjuster, and a model that models non-linearities of a haptic rendering signal chain that includes a haptic transducer load and a driver to the load. For each reference sequence: the sequence adjuster transforms the reference sequence into a test sequence using one or more parameters (e.g., changes reference sequence amplitude and/or period), the model generates an output in response to the test sequence, an error signal is generated that measures a difference between the output and the reference sequence, and if the error signal is above a threshold the parameters are adjusted based on the error signal. These operations are repeated until the error signal is below the threshold in which case the test sequence becomes a selected sequence, which is then sent to the haptic rendering signal chain.

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