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71. 发明申请

US20220408181A1 METHODS AND SYSTEMS FOR MANAGING MIXED MODE ELECTROMECHANICAL ACTUATOR DRIVE 有权
公开(公告)号：US20220408181A1
公开(公告)日：2022-12-22
申请号：US17572769
申请日：2022-01-11
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Jon D. HENDRIX , Emmanuel A. MARCHAIS , Nicholas JOSEPH , Bryant TRAN , Marco A. JANKO , Noel PREECS
IPC分类号： H04R3/00 , G06F3/01 , H03F1/56
摘要： In accordance with embodiments of the present disclosure, a method of driving a playback waveform to an electromagnetic actuator by a transducer driving system may include operating the transducer driving system in a first mode wherein the electromagnetic actuator is driven with the playback waveform in a closed loop to form a closed-loop voltage drive system that includes a negative impedance, operating the transducer driving system in a second mode wherein the electromechanical actuator is driven with the playback waveform in an open loop, and operating a mode switch for transitioning the transducer driving system to operate between the first mode and the second mode.

72. 发明申请

US20220404398A1 METHODS AND SYSTEMS FOR IN-SYSTEM ESTIMATION OF ACTUATOR PARAMETERS 有权
公开(公告)号：US20220404398A1
公开(公告)日：2022-12-22
申请号：US17574188
申请日：2022-01-12
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Jorge L. REYNAGA , Marco A. JANKO , Emmanuel A. MARCHAIS , John L. MELANSON
IPC分类号： G01R19/00 , G08B6/00 , G01R27/02 , H02P29/00
摘要： A method for estimating actuator parameters for an actuator, in-situ and in real-time, may include driving the actuator with a test signal imperceptible to a user of a device comprising the actuator during real-time operation of the device, measuring a voltage and a current associated with the actuator and caused by the test signal, determining one or more parameters of the actuator based on the voltage and the current, determining an actuator type of the actuator based on the one or more parameters, and controlling a playback signal to the actuator based on the actuator type.

73. 发明授权

US11522528B2 Voltage control 有权
公开(公告)号：US11522528B2
公开(公告)日：2022-12-06
申请号：US17086728
申请日：2020-11-02
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Gary Robertson , Hamed Sadati , Rupesh Khare , Sameer Baveja
IPC分类号： H03K3/012 , H04R3/00 , H03K5/08
摘要： This application relates to methods and apparatus for voltage control, and in particular to maintain safe voltages for components of audio driving circuits that are operable in a high voltage mode. An audio driving circuit (100) may include a power supply module (106) and may be operable such that, in use, a voltage magnitude at a source terminal of at least a first transistor (306, 309, 603, 605) of the audio driving circuit can exceed its gate-source voltage tolerance. A voltage generator (111 P) is configured to output a first intermediate voltage (VSAFEP) to an intermediate voltage path for use as a gate control voltage for at least the first transistor, to maintain its gate-source voltage below tolerance. An intermediate path voltage clamp (114P) is provided for selectively clamping the intermediate voltage path to a voltage level, so as to maintain the magnitude of the gate-source voltage of the first transistor below tolerance. The voltage clamp (114P) is enabled by a reset condition (RST) for the audio driving circuit.

74. 发明授权

US11522509B2 Frequency-selective common-mode control and output stage biasing in an operational amplifier for a class-D amplifier loop filter 有权
公开(公告)号：US11522509B2
公开(公告)日：2022-12-06
申请号：US17194395
申请日：2021-03-08
申请人： CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
发明人： Xin Zhao , Tejasvi Das , Xiaofan Fei
IPC分类号： H03F3/45
摘要： An operational amplifier with one or more fully-differential amplifier stages has a common-mode control input. A low-frequency feedback control path is coupled between an output of the fully-differential amplifier stages and the common-mode control input to control low-frequency drift of the common-mode voltage of the output of the stages. A high-frequency feed-forward control path couples a pair of inputs of the stages to control high-frequency ripple of a common-mode voltage of the inputs of the stages. One or more of the differential amplifier stages may have a bias input that controls a direct-current (DC) bias voltage of gates of pull-up transistors of the stage that is both DC and capacitively coupled to the gates so that the stage operates with class A bias at DC and with class AB bias at high frequencies.

75. 发明授权

US11522460B2 Optimizing the control of a hysteretic power converter at low duty cycles 有权
公开(公告)号：US11522460B2
公开(公告)日：2022-12-06
申请号：US17152053
申请日：2021-01-19
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Jason W. Lawrence , Graeme G. Mackay , Sakkarapani Balagopal
IPC分类号： H02M3/158 , G01R19/165 , H03K5/24 , H02M1/00
摘要： A method for controlling a current associated with a power converter may comprise controlling the current based on at least a peak current threshold level for the current and a valley current threshold level for the current, and further controlling the current based on a duration of time that the power converter spends in a switching state of the power converter.

76. 发明授权

US11522440B2 Use of shared feedback among two or more reactive schemes 有权
公开(公告)号：US11522440B2
公开(公告)日：2022-12-06
申请号：US17171815
申请日：2021-02-09
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Ajit Sharma , Jason W. Lawrence , Graeme G. Mackay
IPC分类号： H02M1/32
摘要： A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter and control circuitry configured to control the power converter in accordance with a control variable. The control circuitry may include a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system, a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system, a selector configured to select the control variable from the first intermediate control variable and the second intermediate control variable, and a shared feedback memory element configured to feed back the control variable to inputs of the first control mechanism and the second control mechanism, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

77. 发明申请

US20220366932A1 METHODS AND APPARATUS FOR DETECTING SINGING 有权
公开(公告)号：US20220366932A1
公开(公告)日：2022-11-17
申请号：US17856186
申请日：2022-07-01
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John P. LESSO , Edward V. SINNOTT , Andrew I. BOTHWELL
IPC分类号： G10L25/51 , G10K11/178 , G06F3/16 , G10L25/06 , G10L25/21 , G10L25/30 , H04R1/08
摘要： A method of detecting singing of a user of a personal audio device, the method comprising: receiving a first audio signal comprising bone-conducted speech of the user from a first transducer of the personal audio device; monitoring a second audio signal output to a speaker of the personal audio device; and determining whether the user is singing based on the first audio signal and the second audio signal.

78. 发明授权

US11502671B2 Digital pulse-width modulation (PWM) modulator with dynamically switchable code set for reduced total harmonic distortion and noise (THDN) 有权
公开(公告)号：US11502671B2
公开(公告)日：2022-11-15
申请号：US17162950
申请日：2021-01-29
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Qiang Li , Rahul Singh , Paul Astrachan , Kyehyung Lee
IPC分类号： H03K3/017 , H04R3/00 , H03M3/00
摘要： A digital PWM modulator modulates a digital input signal to drive a PWM signal to a PWM DAC susceptible to introducing inter-symbol interference (ISI) in small PWM edge separation presence causing audio THDN degradation. A multi-bit quantizer switches from a first to second mode when the input signal rises above a threshold. The quantizer quantizes the input signal into a quantized output signal, each sample of which has a code selected from respective first and second quantization code sets. The second set, relative to the first set, causes the digital PWM signal to have increased edge separation to reduce the ISI at high input levels. The first set includes small magnitude codes relative to the second set to reduce quantization noise at low input levels. The threshold is sufficiently low to cause the quantized output signal to be dominated by small codes when operating in the first mode.

79. 发明授权

US11500404B2 Biasing circuitry 有权
公开(公告)号：US11500404B2
公开(公告)日：2022-11-15
申请号：US17140754
申请日：2021-01-04
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John B. Bowlerwell , Andrew J. Howlett , Graeme S. Angus , Andrei Dumitriu
IPC分类号： G05F1/563 , G05F1/575 , G05F1/62 , H03K17/00 , H04R3/00
摘要： The present disclosure relates to circuitry for selecting a bias voltage to output at a bias voltage output node of the circuitry. The circuitry comprises a first circuit node configured to receive a first voltage from a first, unregulated, voltage source and a second circuit node configured to receive a second voltage from a second, regulated, voltage source. A switch arrangement configured to selectively couple the bias voltage output node to the first circuit node or the second circuit node is also provided.

80. 发明申请

US20220359113A1 MINIMIZING TRANSIENT ARTIFACT OF POSITION ESTIMATE IN INDUCTIVELY-SENSED ELECTROMAGNETIC ACTUATOR SYSTEM WITH SHARED INDUCTIVE SENSOR 有权
公开(公告)号：US20220359113A1
公开(公告)日：2022-11-10
申请号：US17568248
申请日：2022-01-04
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Emmanuel A. MARCHAIS , Tejasvi DAS , Siddharth MARU
IPC分类号： H01F7/18
摘要： A system may include an electromagnetic actuator, a first coil configured to drive mechanical displacement of the electromagnetic actuator, a second coil configured to drive mechanical displacement of the electromagnetic actuator, and an inductance sensing subsystem having an inductance sensing path coupled to the first coil and the second coil. The inductance sensing subsystem may be configured to select one of the first coil and the second coil for driving mechanical displacement of the electromagnetic actuator, select the other of the first coil and the second coil as a sensing coil for sensing displacement of the electromagnetic actuator, determine a displacement of the electromagnetic actuator based on a measurement of estimated inductance of the sensing coil, and when switching selection of the sensing coil from the first coil to the second coil determine the displacement of the first coil based on a measured inductance of the first coil at approximately the time of switching selection, estimate state variables of the inductance sensing path to be used with the second coil based on the displacement, and apply the state variables to the inductance sensing path after switching selection of the sensing coil from the first coil to the second coil.

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