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11. 发明授权

US11868540B2 Determination of resonant frequency and quality factor for a sensor system 有权
公开(公告)号：US11868540B2
公开(公告)日：2024-01-09
申请号：US17096598
申请日：2020-11-12
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Ryan Hellman
IPC分类号： G06F3/02 , G01L1/14 , G01L1/00 , G01L1/18 , G01L1/16
CPC分类号： G06F3/0202 , G01L1/005 , G01L1/14 , G01L1/162 , G01L1/183
摘要： A method for determining sensor parameters of an actively-driven sensor system may include obtaining as few as three samples of a measured physical quantity versus frequency for the actively-driven sensor system, performing a refinement operation to provide a refined version of the sensor parameters based on the as few as three samples and based on a linear model of an asymmetry between slopes of the measured physical quantity versus frequency between pairs of the as few as three samples, iteratively repeating the refinement operation until the difference between successive refined versions of the sensor parameters is below a defined threshold, and outputting the refined sensor parameters as updated sensor parameters for the actively-driven sensor system.

12. 发明授权

US11856366B2 Methods and apparatuses for driving audio and ultrasonic signals from the same transducer 有权
公开(公告)号：US11856366B2
公开(公告)日：2023-12-26
申请号：US17079578
申请日：2020-10-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , Cedric Andrieu , Calum Cuthill
IPC分类号： H04R23/00 , H04B1/04 , H04B11/00 , H04R3/04 , H03G3/20 , G01S7/52 , G01S7/524 , G01S15/10 , H03G3/00
CPC分类号： H04R23/00 , G01S7/52004 , G01S7/524 , G01S15/10 , H03G3/005 , H03G3/20 , H04B1/04 , H04B11/00 , H04R3/04 , H04R2420/01 , H04R2499/11
摘要： Driver circuitry is disclosed for driving an electroacoustic transducer to provide an output comprising both ultrasonic and audio signal components. The driver circuitry comprises an adjustment module configured to reduce the level of said ultrasonic component signal in response to an increase in an operational variable indicative of a level of said audio signal component, while also increasing the pulse duration, duty cycle, repetition frequency or frequency span or bandwidth of the ultrasonic component.

13. 发明授权

US11855597B2 Amplifier circuitry 有权
公开(公告)号：US11855597B2
公开(公告)日：2023-12-26
申请号：US17741180
申请日：2022-05-10
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Sameer Baveja , Hamed Sadati
IPC分类号： H03F3/45 , H03F1/26 , H03F1/52
CPC分类号： H03F3/45479 , H03F1/26 , H03F1/52 , H03F2200/03 , H03F2200/153 , H03F2200/78
摘要： This application relates to circuitry for monitoring for instability of an amplifier. The amplifier (100) has a first signal path between an amplifier input (INN) and an amplifier output (VOUT) and a feedback path from the output to form a feedback loop with at least part of the first signal path. A comparator (212) has a first input configured to receive a first signal (INN) derived from a first amplifier node which is part of said feedback loop and a second input configured to receive a second signal (INP) derived from a second amplifier node which varies with the signal at the amplifier input but does not form part of said feedback loop. The comparator is configured to compare the first signal to the second signal and generate a comparison signal (COMP), wherein in the event of amplifier instability the comparison signal comprises a characteristic indicative of amplifier instability.

14. 发明授权

US11855531B2 Hybrid power converter 有权
公开(公告)号：US11855531B2
公开(公告)日：2023-12-26
申请号：US17582836
申请日：2022-01-24
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Changjong Lim
IPC分类号： H02M3/07 , H02M1/00
CPC分类号： H02M3/07 , H02M1/0095
摘要： A power converter for converting an input voltage at an input of the power converter into an output voltage at an output of the power converter may include a switching node, a power inductor coupled between the switching node and the output, a flying capacitor having a first flying capacitor terminal and a second flying capacitor terminal, a pump capacitor having a first pump capacitor terminal and a second pump capacitor terminal, the second pump capacitor terminal coupled to ground, a first switch coupled between the input and the first flying capacitor terminal, a second switch coupled between the first flying capacitor terminal and the switching node, a third switch coupled between the second flying capacitor terminal and the switching node, a fourth switch coupled between the second flying capacitor terminal and a ground voltage, a fifth switch coupled between the second flying capacitor terminal and the first pump capacitor terminal, and a sixth switch coupled between the output and the first pump capacitor terminal.

15. 发明授权

US11829461B2 Methods, apparatus and systems for audio playback 有权
公开(公告)号：US11829461B2
公开(公告)日：2023-11-28
申请号：US18101843
申请日：2023-01-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , John Forsyth
IPC分类号： G06F21/32 , G06F3/16 , H04R1/10 , G10K11/178 , G10L25/51 , H04R1/02 , H04R29/00
CPC分类号： G06F21/32 , G06F3/165 , G10K11/1783 , G10K11/17823 , H04R1/1041 , G10K2210/1081 , G10K2210/3055 , G10L25/51 , H04R1/028 , H04R29/00
摘要： The present invention relates to methods, apparatus and systems for audio playback via a personal audio device following a biometric process. A personal audio device may be used to obtain ear model data for authenticating a user via an ear biometric authentication system. Owing to that successful authentication, the electronic device is informed of the person who is listening to audio playback from the device. Thus the device can implement one or more playback settings which are specific to that authorised user.

16. 发明授权

US11815534B2 Current sensing 有权
公开(公告)号：US11815534B2
公开(公告)日：2023-11-14
申请号：US17678345
申请日：2022-02-23
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Tahir Rashid , Mehul Mistry
IPC分类号： G01R19/00 , H03G3/30
CPC分类号： G01R19/0023 , H03G3/3042
摘要： This invention relates to current sensing, in particular for a signal processing circuit (500) for outputting an output signal (Sout) based on an input signal (Sin). An output stage (101) includes an output transistor (102) driven, in use, by a drive signal. A current monitor (501) is configured to monitor, in use, a first current through the output transistor, wherein the current monitor comprises a current sensor (105) having a sense transistor (106) configured to be driven based on the drive signal so as to generate a sense current related to the first current. A compensation controller (301) receives an indication of signal level of the input signal and controllably varies operation of the current monitor (501) so as to at least partially compensate for signal-dependent variation in a relationship between the first current and the first sense current.

17. 发明授权

US11814284B2 Composite structures 有权
公开(公告)号：US11814284B2
公开(公告)日：2023-11-14
申请号：US16825593
申请日：2020-03-20
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Roberto Brioschi , Rkia Achehboune
IPC分类号： H01L23/00 , B81C1/00 , B81B3/00 , H04R19/00
CPC分类号： B81C1/0023 , B81B3/0021 , B81C1/00253 , H01L24/19 , H04R19/005 , B81B2201/0257 , B81B2201/0264 , B81B2203/0127 , H01L2924/1461 , H04R2201/003
摘要： The application relates to structures, e.g. substrates for supporting semiconductor die. The substrate defines a frame which lateral surrounds one or more die and is provided in contact with at least one side surface of the die, wherein the frame defines upper and lower surfaces of the substrate.

18. 发明授权

US11810544B2 Systems and methods for on ear detection of headsets 有权
公开(公告)号：US11810544B2
公开(公告)日：2023-11-07
申请号：US17705974
申请日：2022-03-28
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Brenton Steele
IPC分类号： G10K11/178 , H04R3/00
CPC分类号： G10K11/17881 , H04R3/002 , H04R3/007 , G10K2210/1081 , G10K2210/3028 , G10K2210/3226
摘要： Embodiments generally relate to a signal processing device for on ear detection for a headset. The device comprises a first microphone input for receiving a microphone signal from a first microphone, the first microphone being configured to be positioned inside an ear of a user when the user is wearing the headset; a second microphone input for receiving a microphone signal from a second microphone, the second microphone being configured to be positioned outside the ear of the user when the user is wearing the headset; and a processor. The processor is configured to receive microphone signals from each of the first microphone input and the second microphone input; pass the microphone signals through a first filter to remove low frequency components, producing first filtered microphone signals; combine the first filtered microphone signals to determine a first on ear status metric; pass the microphone signals through a second filter to remove high frequency components, producing second filtered microphone signals; combine the second filtered microphone signals to determine a second on ear status metric; and combine the first on ear status metric with the second on ear status metric to determine the on ear status of the headset.

19. 发明授权

US11804813B2 Class D amplifier circuit 有权
公开(公告)号：US11804813B2
公开(公告)日：2023-10-31
申请号：US17386287
申请日：2021-07-27
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , Toru Ido
IPC分类号： H03F3/217 , H03G3/30 , H03F1/26 , H03F1/32 , H03F3/187 , H03F1/34 , H03G7/00
CPC分类号： H03G3/3089 , H03F1/26 , H03F1/32 , H03F1/34 , H03F3/187 , H03F3/217 , H03F3/2175 , H03G7/002 , H03G7/007 , H03F3/2171 , H03F3/2173 , H03F2200/102 , H03F2200/339 , H03F2200/432
摘要： This application relates to Class D amplifier circuits. A modulator controls a Class D output stage based on a modulator input signal (Dm) to generate an output signal (Vout) which is representative of an input signal (Din). An error block, which may comprise an ADC, generates an error signal (ε) from the output signal and the input signal. In various embodiments the extent to which the error signal (ε) contributes to the modulator input signal (Dm) is variable based on an indication of the amplitude of the input signal (Din). The error signal may be received at a first input of a signal selector block. The input signal may be received at a second input of the signal selector block. The signal selector block may be operable in first and second modes of operation, wherein in the first mode the modulator input signal is based at least in part on the error signal; and in the second mode the modulator input signal is based on the digital input signal and is independent of the error signal. The error signal can be used to reduce distortion at high signal levels but is not used at low signal levels and so the noise floor at low signal levels does not depend on the component of the error block.

20. 发明授权

US11792569B2 Driver circuits 有权
公开(公告)号：US11792569B2
公开(公告)日：2023-10-17
申请号：US18101816
申请日：2023-01-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Anthony S. Doy , Eric J. King
IPC分类号： H04R3/00 , H03K17/687 , H03F3/217
CPC分类号： H04R3/00 , H03K17/687 , H03F3/217
摘要： The application describes a switched driver (401) for outputting a drive signal at an output node (402) 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 (403H, 403L). 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 (N1) by a path that include or bypass the first capacitor, and the second input node can be selectively coupled to a second node (N2) by a path that includes or bypasses the second capacitor. The output node (402) 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.

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