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21. 发明授权

US09899978B2 Class D amplifier circuit 有权
公开(公告)号：US09899978B2
公开(公告)日：2018-02-20
申请号：US15466661
申请日：2017-03-22
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , Toru Ido
IPC分类号： H03F3/217 , H03G3/30 , H03F1/34 , H03G7/00
CPC分类号： H03G3/3089 , H03F1/26 , H03F1/32 , H03F1/34 , H03F3/187 , H03F3/217 , H03F3/2171 , H03F3/2173 , H03F3/2175 , H03F2200/102 , H03F2200/339 , H03F2200/432 , H03G7/002 , H03G7/007
摘要： This application relates to Class D amplifier circuits (200). A modulator (201) controls a Class D output stage (202) based on a modulator input signal (Dm) to generate an output signal (Vout) which is representative of an input signal (Din). An error block (205), which may comprise an ADC (207), 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 (204) of a signal selector block (203). The input signal may be received at a second input (206) of the signal selector block (203). 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 (205).

22. 发明申请

US20160065158A1 CLASS D AMPLIFIER CIRCUIT 有权
标题翻译： D类放大器电路
公开(公告)号：US20160065158A1
公开(公告)日：2016-03-03
申请号：US14836006
申请日：2015-08-26
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , Toru Ido
IPC分类号： H03G3/30 , H03F3/217 , H03F1/34
CPC分类号： H03G3/3089 , H03F1/26 , H03F1/32 , H03F1/34 , H03F3/187 , H03F3/217 , H03F3/2171 , H03F3/2173 , H03F3/2175 , H03F2200/102 , H03F2200/339 , H03F2200/432 , H03G7/002 , H03G7/007
摘要： This application relates to Class D amplifier circuits (200). A modulator (201) controls a Class D output stage (202) based on a modulator input signal (Dm) to generate an output signal (Vout) which is representative of an input signal (Din). An error block (205), which may comprise an ADC (207), 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 (204) of a signal selector block (203). The input signal may be received at a second input (206) of the signal selector block (203). 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 (205).
摘要翻译：本申请涉及D类放大器电路（200）。调制器（201）基于调制器输入信号（Dm）控制D类输出级（202），以产生代表输入信号（Din）的输出信号（Vout）。可以包括ADC（207）的误差块（205）从输出信号和输入信号产生误差信号（＆egr）。在各种实施例中，基于输入信号（Din）的振幅的指示，可以对误差信号（＆egr）贡献于调制器输入信号（Dm）的程度是可变的。误差信号可以在信号选择器块（203）的第一输入（204）处被接收。可以在信号选择器块（203）的第二输入（206）处接收输入信号。信号选择器块可以在第一和第二操作模式下操作，其中在第一模式中，调制器输入信号至少部分地基于误差信号; 并且在第二模式中，调制器输入信号基于数字输入信号，并且与误差信号无关。误差信号可以用于降低高信号电平的失真，但不会在低信号电平下使用，因此低信号电平的噪声基底不依赖于误差块的分量（205）。

23. 发明授权

US11918345B2 Cough detection 有权
公开(公告)号：US11918345B2
公开(公告)日：2024-03-05
申请号：US18298573
申请日：2023-04-11
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John P. Lesso , Yanto Suryono , Toru Ido
IPC分类号： A61B5/08 , A61B5/00
CPC分类号： A61B5/0823 , A61B5/0803 , A61B5/6803 , A61B5/7246 , A61B5/725 , A61B5/7264 , A61B5/7275 , A61B2562/0219
摘要： A method of cough detection in a headset, the method comprising: receiving a first signal from an external transducer of the headset; receiving a second signal from an in-ear transducer of the headset; and detecting a cough of a user of the headset based on the first and second signals.

24. 发明授权

US11755894B2 Computing circuitry for configuration and operation of cells and arrays comprising memristor elements 有权
公开(公告)号：US11755894B2
公开(公告)日：2023-09-12
申请号：US16838495
申请日：2020-04-02
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Gordon James Bates , Toru Ido
IPC分类号： G11C11/54 , G06N3/063 , G11C13/00
CPC分类号： G06N3/063 , G11C11/54 , G11C13/0069 , G11C2013/0078
摘要： This application relates to methods and apparatus for computing, especially to circuitry for performing computing, at least partly, in the analogue domain. The circuitry (200) comprises a plurality of memory cells (201), each memory cell having first and second paths between an electrode (202) for receiving an input current and respective positive and negative electrodes (203) for outputting a differential-current output. Memristors (101) are located in the first and second paths. The memory cells are configured into sets (205) of memory cells, the memory cells of each said set being connected so as to provide a differential current set output that corresponds to a combination of the cell outputs of all of the memory cells of that set. For each set, at least some of the memory cells of that set are configured to receive a different input current to other memory cells of that set.

25. 发明授权

US11731163B2 Driver circuitry for piezoelectric transducers 有权
公开(公告)号：US11731163B2
公开(公告)日：2023-08-22
申请号：US16989050
申请日：2020-08-10
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John P. Lesso , Toru Ido
IPC分类号： H01L41/04 , B06B1/02 , H02M3/07 , H10N30/20 , H10N30/80
CPC分类号： B06B1/0207 , H02M3/07 , H10N30/20 , H10N30/802
摘要： The present disclosure relates to circuitry for driving a piezoelectric transducer based on an input signal. The circuitry comprises: primary driver circuitry configured to receive the input signal and to output a primary driving signal to the piezoelectric transducer based on the input signal; and secondary driver circuitry configured to receive an error signal indicative of an error between the input signal and the primary driving signal and to output a secondary driving signal to the piezoelectric transducer based on the error signal, wherein the primary driver circuitry and the secondary driver circuitry both comprise switching converter circuitry.

26. 发明授权

US11653855B2 Cough detection 有权
公开(公告)号：US11653855B2
公开(公告)日：2023-05-23
申请号：US17541904
申请日：2021-12-03
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John P. Lesso , Yanto Suryono , Toru Ido
IPC分类号： A61B5/08 , A61B5/083 , A61B5/00
CPC分类号： A61B5/0823 , A61B5/0803 , A61B5/6803 , A61B5/725 , A61B5/7246 , A61B5/7264 , A61B5/7275 , A61B2562/0219
摘要： A method of cough detection in a headset, the method comprising: receiving a first signal from an external transducer of the headset; receiving a second signal from an in-ear transducer of the headset; and detecting a cough of a user of the headset based on the first and second signals.

27. 发明授权

US11646708B2 Driver circuitry 有权
公开(公告)号：US11646708B2
公开(公告)日：2023-05-09
申请号：US17113561
申请日：2020-12-07
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John P. Lesso , Toru Ido
IPC分类号： H03G3/30 , H03F3/183 , H04R17/00
CPC分类号： H03G3/3005 , H03F3/183 , H04R17/00 , H03F2200/03 , H03G2201/103
摘要： The present disclosure relates to circuitry for driving a piezoelectric transducer. The circuitry comprises amplifier circuitry configured to receive a drive signal and to output an output signal, based on the drive signal, to the piezoelectric transducer, a variable capacitor configured to be coupled in series with the piezoelectric transducer, and control circuitry. The control circuitry is configured to control a capacitance of the variable capacitor to compensate for hysteresis in the piezoelectric transducer and to control a gain of the amplifier circuitry to compensate for signal attenuation caused by the variable capacitor.

28. 发明授权

US11121690B2 Class D amplifier circuit 有权
公开(公告)号：US11121690B2
公开(公告)日：2021-09-14
申请号：US16552843
申请日：2019-08-27
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
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.

29. 发明授权

US10566962B2 Pulse-width modulation 有权
公开(公告)号：US10566962B2
公开(公告)日：2020-02-18
申请号：US15916708
申请日：2018-03-09
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： Toru Ido
IPC分类号： H03K7/08 , H03F3/217 , H03M1/82
摘要： This application relates to digital PWM modulation. A PWM modulator (400, 1100) has a PWM generator (402) configured to receive pulse width data (PWidth) and to output a PWM signal (SPWM) comprising a plurality of repeating PWM cycle periods, in which the duration of any pulse of the PWM signal in each PWM cycle period is based on the pulse width data. The PWM generator is configured to synchronise the PWM cycle periods, and the start and end of any PWM pulse, to a received first clock signal. The PWM generator is operable to generate pulses that have a positional error from a centred position within the PWM cycle period and a pulse position controller (403) is configured to control the position of a pulse in a PWM cycle period so as to at least partly compensate for the positional error of one or more preceding pulses.

30. 发明授权

US10070223B2 Signal processing for MEMS capacitive transducers 有权
公开(公告)号：US10070223B2
公开(公告)日：2018-09-04
申请号：US15628057
申请日：2017-06-20
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul Lesso , Emmanuel Philippe Christian Hardy , James Thomas Deas , Toru Ido
IPC分类号： H04R3/06 , G01D5/244 , G01P15/125 , H04R19/00 , H03M1/06 , H03M3/00 , H04R19/04 , G01D5/24 , G01D3/02 , H04R29/00 , H03M1/12 , G01P15/08
摘要： This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path. The monitoring may be performed in an analogue or a digital part of the signal path and in either case the modification may be applied in an analogue or a digital part of the signal path.

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