公开(公告)号：US20170047895A1

公开(公告)日：2017-02-16

申请号：US15336995

申请日：2016-10-28

Applicant: Cirrus Logic, Inc.

Inventor： Ramin ZANBAGHI

IPC: H03F1/02 ,  H03F3/185 ,  H03F3/217 ,  H03F1/30

Abstract: An integrated circuit may have two signal paths: an open-loop modulator (which may comprise a digital-input Class-D amplifier) and a closed-loop modulator (which may comprise an analog-input Class-D amplifier). A control subsystem may be capable of selecting either of the open-loop modulator or the closed-loop modulator as a selected path based on one or more characteristics (e.g., signal magnitude) of an input audio signal. For example, for higher-magnitude signals, the closed-loop modulator may be selected while the open-loop modulator may be selected for lower-magnitude signals. In some instances, when the open-loop modulator is selected as the selected path, the closed-loop modulator may power off, which may reduce power consumption. In addition, one or more techniques may be applied to reduce or eliminate user-perceptible audio artifacts caused by switching between the open-loop modulator and the closed-loop modulator, and vice versa.

Abstract translation: 集成电路可以具有两个信号路径：开环调制器（其可以包括数字输入D类放大器）和闭环调制器（其可以包括模拟输入D类放大器）。 控制子系统可以基于输入音频信号的一个或多个特性（例如，信号幅度）来选择开环调制器或闭环调制器中的任一个作为选择的路径。 例如，对于较高幅度的信号，可以选择闭环调制器，同时为低电平信号选择开环调制器。 在一些情况下，当选择开环调制器作为选择的路径时，闭环调制器可以断电，这可能降低功耗。 此外，可以应用一种或多种技术来减少或消除由开环调制器和闭环调制器之间的切换引起的用户可感知的音频伪像，反之亦然。

公开(公告)号：US09552805B2

公开(公告)日：2017-01-24

申请号：US14577519

申请日：2014-12-19

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Antonio J. Miller ,  Ning Li

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/178 ,  G10K11/17833 ,  G10K11/17875 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/506 ,  H04R1/1083 ,  H04R2460/01

Abstract: A method for cancelling ambient audio sounds in the proximity of a transducer may include receiving an error microphone signal indicative of the output of the transducer and ambient audio sounds at the transducer. The method may also include generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer, wherein generating the anti-noise signal comprises applying a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal and applying a variable gain element in series with the feedback filter. The method may further include monitoring whether an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal and controlling the gain of the variable gain element to reduce the undesirable component.

Abstract translation: 用于消除传感器附近的环境音频声音的方法可以包括接收指示换能器的输出的误差麦克风信号和换能器处的环境音频声音。 该方法还可以包括产生用于抵消在换能器的声输出处的环境音频声音的影响的抗噪声信号，其中产生抗噪声信号包括应用具有产生反馈抗噪声信号的响应的反馈滤波器 基于误差麦克风信号并与反馈滤波器串联地施加可变增益元件。 该方法还可以包括监视是否正在发生可能导致反馈滤波器在抗噪声信号中产生不期望的分量并且控制可变增益元件的增益以减少不期望的分量的环境音频事件。

公开(公告)号：US09504118B2

公开(公告)日：2016-11-22

申请号：US14624475

申请日：2015-02-17

Applicant: Cirrus Logic, Inc.

Inventor： Shatam Agarwal ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0887 ,  H05B33/0815

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as a converter in LED-based light bulbs. The power stage may be operated by a controller to maintain a desired current output to the LED load. A resistor may be coupled to the BJT through a switch at the emitter of the BJT. The switch may regulate operation of the BJT by allowing current flow to ground through the resistor. The controller may perform measurements of the resistor to allow higher accuracy determinations of the current through the BJT and thus improve regulation of current to the LED load.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如基于LED的灯泡中的转换器。 功率级可以由控制器操作以保持对LED负载的期望的电流输出。 电阻器可以通过BJT的发射极处的开关耦合到BJT。 开关可以通过电流流过地电流来调节BJT的工作。 控制器可以执行电阻的测量，以允许通过BJT的电流的更高的精度确定，从而改善对LED负载的电流的调节。

公开(公告)号：US09503112B1

公开(公告)日：2016-11-22

申请号：US15154769

申请日：2016-05-13

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ramin Zanbaghi ,  Yousof Mortazavi ,  Aaron Brennan ,  John L. Melanson

IPC: H03M1/06 ,  H03M1/10

CPC classification number: H03M1/0602 ,  G10L19/00 ,  H03M1/1004 ,  H03M1/1038 ,  H03M1/1042 ,  H03M1/188 ,  H03M1/60

Abstract: The overall performance of a dual-path ADC system may be improved by using a VCO-based ADC for small-amplitude signals and employing non-linear cancellation to remove nonlinearities in signals output by the VCO-based ADC. In particular, VCO-based dual-path ADC systems of this disclosure may be configured to receive a first digital signal from a first ADC and a second digital signal from a second ADC, wherein the second digital signal is more non-linear than the first digital signal. The dual-path systems may also be configured to determine one or more non-linear coefficients of the second digital signal based, at least in part, on processing of the first and second digital signals. The dual-path systems may be further configured to modify the second digital signal based, at least in part, on the determined one or more non-linear coefficients to generate a more linear second digital signal.

Abstract translation: 通过使用基于VCO的ADC用于小振幅信号并采用非线性消除来消除由基于VCO的ADC输出的信号中的非线性，可以提高双路ADC系统的整体性能。 特别地，本公开的基于VCO的双路径ADC系统可以被配置为从第一ADC接收第一数字信号和从第二ADC接收第二数字信号，其中第二数字信号比第一ADC更非线性 数字信号。 至少部分地基于第一和第二数字信号的处理，双路系统还可以被配置为确定第二数字信号的一个或多个非线性系数。 至少部分地基于所确定的一个或多个非线性系数来修改第二数字信号以生成更线性的第二数字信号。

公开(公告)号：US09479868B2

公开(公告)日：2016-10-25

申请号：US14036136

申请日：2013-09-25

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Daniel John Allen ,  Aniruddha Satoskar

IPC: H04R3/00 ,  H04R29/00 ,  G10K11/178 ,  H03F1/02 ,  H03F3/181 ,  H03F3/52 ,  H03F3/185 ,  H03F1/52 ,  H03F3/183 ,  H04R5/04

CPC classification number: H04R3/007 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3049 ,  H03F1/0211 ,  H03F1/0227 ,  H03F1/52 ,  H03F3/181 ,  H03F3/183 ,  H03F3/185 ,  H03F3/52 ,  H03F2200/03 ,  H03F2200/462 ,  H03F2200/471 ,  H04R5/04 ,  H04R29/001 ,  H04R2420/05

Abstract: In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

Abstract translation: 根据本公开的系统和方法，音频设备可以包括电端子，音频电路和换能器负载检测电路。 电气终端可将传感器装置耦合到音频装置。 音频电路可以产生模拟音频信号，其中模拟音频信号耦合到电气端子。当换能器装置从音频装置耦合到音频装置时，传感器负载检测电路可以检测换能器装置的负载阻抗， 电气终端。

公开(公告)号：US09473087B2

公开(公告)日：2016-10-18

申请号：US14521191

申请日：2014-10-22

Applicant: Wolfson Microelectronics Ltd.

Inventor： John Paul Lesso ,  Toru Ido

IPC: H03F3/38 ,  H03F3/217 ,  H03F1/02

CPC classification number: H03F3/2171 ,  H03F1/0211 ,  H03F3/187 ,  H03F3/217 ,  H03F2200/165 ,  H03F2200/171 ,  H03F2200/333 ,  H03F2200/351 ,  H03G1/0088

Abstract: Methods and apparatus for Class-D amplifier circuits with improved power efficiency. The circuit has an output stage with at least first and second switches and a modulator that receives an input signal to be amplified, SIN, and a first clock signal fSW. The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.

Abstract translation: 具有提高功率效率的D类放大器电路的方法和装置。 电路具有至少具有第一和第二开关的输出级和接收要被放大的输入信号SIN和第一时钟信号fSW的调制器。 调制器基于输入信号在开关周期内控制第一和第二开关的占空比，其中开关周期具有基于第一时钟信号的开关频率。 频率控制器响应于输入信号的幅度的指示来控制第一时钟信号的频率，以便提供第一输入信号幅度的第一开关频率和在第二输入信号幅度下的第二，较低开关频率 ，输入信号幅度。 在低信号幅度下可以容忍较低的开关频率，并且以这种方式改变开关频率，从而在降低开关功率损耗的同时保持稳定性。

公开(公告)号：US09467778B2

公开(公告)日：2016-10-11

申请号：US13844802

申请日：2013-03-16

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. Swanson ,  Ed Schneider

IPC: H04R3/00

CPC classification number: H04R3/005

Abstract: An interface for an array of digital microphones in an electronic device may include a head-end chip coupled to the digital microphones through a bus. The bus may be shared by each microphone of the array of microphones and be multiplexed to allow transmission of data from the microphones to the head-end chip and transmission of power from the head-end chip to the array of digital microphones. The head-end chip may perform signal processing on receive data from the array of digital microphones to create beamforming arrays. The array of microphones may include microphones with different characteristics to improve performance of the array of microphones.

Abstract translation: 用于电子设备中的数字麦克风阵列的接口可以包括通过总线耦合到数字麦克风的头端芯片。 总线可以由麦克风阵列的每个麦克风共享，并被复用以允许数据从麦克风传输到头端芯片，并将功率从头端芯片传输到数字麦克风阵列。 前端芯片可以对来自数字麦克风阵列的接收数据执行信号处理，以创建波束成形阵列。 麦克风阵列可以包括具有不同特性的麦克风，以改善麦克风阵列的性能。

公开(公告)号：US09377792B2

公开(公告)日：2016-06-28

申请号：US13548963

申请日：2012-07-13

Applicant: Lingli Zhang ,  Michael Pate

Inventor： Lingli Zhang ,  Michael Pate

IPC: G05F1/10 ,  H03F3/217 ,  H05B33/08 ,  H02M3/156

CPC classification number: G05F1/10 ,  H02M3/156 ,  H03F3/217 ,  H05B33/0842 ,  Y10T307/438

Abstract: A single integrated circuit includes a single boost converter, a first circuit, a second circuit, and a controller. The single boost converter supplies power to the first and second circuits. The controller receives an operational mode signal and in response to the operational mode signal, drives the single boost converter to respectively provide power to the first and second circuits. When the first and second circuits are simultaneously active, the controller manages an operation of the first circuit so that proper operation of the second circuit is maintained. The first circuit may be an LED flash driver, and the second circuit may be an audio amplifier, such as a Class-D audio amplifier. The controller manages an operation of the audio amplifier so that a sufficient amount of current is supplied to the LED flash driver for proper operation of the LED flash driver.

Abstract translation: 单个集成电路包括单个升压转换器，第一电路，第二电路和控制器。 单个升压转换器为第一和第二电路供电。 控制器接收操作模式信号并且响应于操作模式信号，驱动单个升压转换器以分别向第一和第二电路提供电力。 当第一和第二电路同时有效时，控制器管理第一电路的操作，从而保持第二电路的正常操作。 第一电路可以是LED闪光驱动器，并且第二电路可以是诸如D类音频放大器的音频放大器。 控制器管理音频放大器的操作，使得足够量的电流被提供给LED闪光灯驱动器以适当地操作LED闪光灯驱动器。

公开(公告)号：US09363610B2

公开(公告)日：2016-06-07

申请号：US14452067

申请日：2014-08-05

Applicant: Wolfson Microelectronics plc

Inventor： Anthony Bernard Traynor ,  Richard Ian Laming ,  Tsjerk H. Hoekstra

IPC: H01L29/84 ,  H04R23/00 ,  B81B3/00 ,  H04R19/04 ,  H01L27/00 ,  H04R19/00 ,  H04R31/00

CPC classification number: H04R19/04 ,  B81B3/0021 ,  B81B3/0072 ,  B81B3/0094 ,  B81B2201/00 ,  B81B2201/0235 ,  B81B2201/0257 ,  B81B2201/0264 ,  H01L27/00 ,  H04R19/00 ,  H04R19/005 ,  H04R23/00 ,  H04R31/00 ,  H04R2499/11

Abstract: A method of fabricating a micro-electrical-mechanical system (MEMS) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume. The cross-sectional area of the second back-volume portion can be made greater than the cross-sectional area of the membrane, thereby enabling the back-volume to be increased without being constrained by the cross-sectional area of the membrane. The back-volume may comprise a third back-volume portion. The third back-volume portion enables the effective diameter of the membrane to be formed more accurately.

Abstract translation: 制造微机电系统（MEMS）换能器的方法包括以下步骤：在衬底上形成膜，并在衬底中形成后体积。 在基板中形成后部体积的步骤包括以下步骤：形成第一后部体积部分和第二背部体积部分，第一后部体积部分与第二背部体积部分分离， 背部体积的侧壁。 第二后部容积部分的横截面面积可以大于膜的横截面面积，从而能够增加后部体积，而不受膜的横截面面积的约束。 背部容积可以包括第三后部体积部分。 第三后部体积部分能够更准确地形成膜的有效直径。

公开(公告)号：US09357300B2

公开(公告)日：2016-05-31

申请号：US14864639

申请日：2015-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Jie Su

IPC: H04R3/00

CPC classification number: H04R3/007

Abstract: In accordance with embodiments of the present disclosure, systems and methods may include a controller configured to be coupled to an audio speaker, wherein the controller receives one or more signals indicative of one or more operating characteristics of the audio speaker and compares the one or more operating characteristics to one or more speaker protection thresholds, and based on the comparison, processes an audio input signal to generate an audio output signal communicated from the controller to the audio speaker, further wherein the one or more speaker protection thresholds are based on offline reliability testing of one or more audio speakers similar to the audio speaker and the controller generates one or more modeled parameters for the audio speaker and modifies the one or more speaker protection thresholds based on the one or more modeled parameters.