公开(公告)号：US09124220B2

公开(公告)日：2015-09-01

申请号：US14038097

申请日：2013-09-26

申请人： Robert Bosch GmbH

发明人： John Matthew Muza ,  Philip Sean Stetson

IPC分类号： H04R3/00 ,  H03F3/187 ,  H04R1/40 ,  H04R19/00 ,  H03F3/45

CPC分类号： H03F3/187 ,  G10K11/178 ,  H03F3/45928 ,  H04R1/406 ,  H04R3/005 ,  H04R19/005 ,  H04R2201/003 ,  H04R2201/405

摘要： Methods and system are described for cancelling interference in a microphone system. A positive bias voltage is applied to a first microphone diaphragm and a negative bias voltage is applied to a second microphone diaphragm. The diaphragms are configured to exhibit substantially the same mechanical deflection in response to acoustic pressures received by the microphone system. A differential output signal is produced by combining a positively-biased output signal from the first microphone diaphragm and a negatively-biased output signal from the second microphone diaphragm. This combining cancels common-mode interferences that are exhibited in both the positively-biased output signal and the negatively-biased output signal.

摘要翻译： 描述了消除麦克风系统干扰的方法和系统。 正偏置电压施加到第一麦克风隔膜，负偏置电压施加到第二麦克风隔膜。 隔膜被构造为响应于由麦克风系统接收的声压而表现出基本相同的机械偏转。 通过组合来自第一麦克风隔膜的正偏置输出信号和来自第二麦克风隔膜的负偏置输出信号来产生差分输出信号。 该组合取消了在正偏置输出信号和负偏置输出信号两者中呈现的共模干扰。

公开(公告)号：US20150137888A1

公开(公告)日：2015-05-21

申请号：US14599701

申请日：2015-01-19

申请人： STMICROELECTRONICS (SHENZHEN) R&D CO. LTD

发明人： Mei YANG ,  YueHua WANG ,  Xaut ZHANG ,  Kelvin WEN ,  XiangSheng LI

IPC分类号： H03F3/21 ,  H03F3/45

CPC分类号： H03F3/211 ,  H03F3/187 ,  H03F3/26 ,  H03F3/4508 ,  H03F3/45475 ,  H03F3/68 ,  H03F2200/03 ,  H03F2203/21131 ,  H03F2203/45102 ,  H03F2203/45154 ,  H03F2203/45244 ,  H03F2203/45528 ,  H03F2203/45552

摘要： A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.

摘要翻译： 用于AB类放大器的钳位电路包括参考电压电路，具有耦合到参考电压电路的输入的四个NPN达林顿晶体管和用于提供四个钳位电压的输出和具有耦合到参考电压电路的输入的分立NPN达林顿晶体管， 和四个单独的输出，用于提供四个交流接地电压。

公开(公告)号：US20150110291A1

公开(公告)日：2015-04-23

申请号：US14512858

申请日：2014-10-13

申请人： Knowles Electronics LLC

发明人： Claus Erdmann Furst ,  John Nielsen

IPC分类号： H04R3/04 ,  H04R1/08 ,  H03F3/45

CPC分类号： H04R3/00 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/45941 ,  H03F2203/45512 ,  H03F2203/45526 ,  H03F2203/45528 ,  H03F2203/45544 ,  H04R19/04

摘要： A differential high impedance circuit for use in an acoustic apparatus includes a first set of transistor devices and a second set of transistor devices. The first set of transistor devices includes a first transistor (302) and a second transistor (306), and the first transistor (302) coupled to Vdd and the second transistor (306) coupled ground. The second set of two transistor devices includes a third transistor (304) and a fourth transistor (308). The third transistor (304) is coupled to the first transistor (302) and provides a first output (Out+), and the fourth transistor (308) is coupled to the second transistor (306) and provides a second output (Out−). The first and second outputs configured to provide a resistance.

摘要翻译： 用于声学设备的差分高阻抗电路包括第一组晶体管器件和第二组晶体管器件。 第一组晶体管器件包括第一晶体管（302）和第二晶体管（306），并且耦合到Vdd的第一晶体管（302）和耦合地的第二晶体管（306）。 第二组两个晶体管器件包括第三晶体管（304）和第四晶体管（308）。 第三晶体管（304）耦合到第一晶体管（302）并提供第一输出（Out +），并且第四晶体管（308）耦合到第二晶体管（306）并提供第二输出（Out-）。 第一和第二输出被配置成提供电阻。

公开(公告)号：US20150109056A1

公开(公告)日：2015-04-23

申请号：US14521191

申请日：2014-10-22

申请人： Wolfson Microelectronics plc

发明人： John Paul Lesso ,  Toru Ido

IPC分类号： H03F3/217 ,  H03F1/02

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

摘要： 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.

摘要翻译： 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：US08988146B1

公开(公告)日：2015-03-24

申请号：US13986803

申请日：2013-06-07

申请人： Ion E. Opris

发明人： Ion E. Opris

IPC分类号： H03K17/16 ,  H03F3/45 ,  H03K17/687

CPC分类号： H03K17/165 ,  H03F3/187 ,  H03F3/45475 ,  H03F2203/45514 ,  H03K17/6871

摘要： According to some embodiments, a switch having an “on” state and an “off” state is exhibiting a low impedance in the “on” state, and a very high impedance in the “off” state. The switch comprises three series MOS transistors, the first transistor having its drain connected to the input. The switch also comprises additional circuitry which reduces, in the “off” state, the leakage current of the MOS transistor connected to the input of the switch by connecting its source and bulk to an electrical node replicating the voltage of the input node. According to some embodiments, the said switch is used in a voltage amplifier for capacitive sensing devices, such as MEMS gyroscopes and MEMS microphones; the voltage amplifier uses an operational amplifier used in a trans-capacitance configuration, with the feedback path comprising the said switch and a capacitor, wherein the said switch is connected to the input of, the voltage amplifier. According to some embodiments, the said switch is used in an integrated circuit which processes the voltage across a sensing device.

摘要翻译： 根据一些实施例，具有“导通”状态和“断开”状态的开关在“接通”状态下呈现低阻抗，并且在“断开”状态下呈现非常高的阻抗。 开关包括三个串联MOS晶体管，第一晶体管的漏极连接到输入端。 开关还包括附加电路，其通过将源极和体积连接到复制输入节点的电压的电节点，在“关断”状态下降低连接到开关输入端的MOS晶体管的漏电流。 根据一些实施例，所述开关用于诸如MEMS陀螺仪和MEMS麦克风的电容感测装置的电压放大器; 电压放大器使用用于跨电容配置的运算放大器，反馈路径包括所述开关和电容器，其中所述开关连接到电压放大器的输入端。 根据一些实施例，所述开关用于处理感测装置两端的电压的集成电路。

公开(公告)号：US20150071466A1

公开(公告)日：2015-03-12

申请号：US14448848

申请日：2014-07-31

申请人： Wolfson Microelectronics plc

发明人： Jean Pierre Lasseuguette ,  James Deas

IPC分类号： H03F3/183 ,  H04R23/00 ,  H03F3/45

CPC分类号： H03F3/183 ,  H03F1/0266 ,  H03F1/3205 ,  H03F1/3211 ,  H03F3/185 ,  H03F3/187 ,  H03F3/45071 ,  H03F3/45183 ,  H03F3/45188 ,  H03F3/45197 ,  H03F3/45654 ,  H03F2200/03 ,  H03F2200/78 ,  H03F2203/45112 ,  H03F2203/45244 ,  H03F2203/45392 ,  H03F2203/45396 ,  H03F2203/45418 ,  H03F2203/45424 ,  H03F2203/45498 ,  H03F2203/45658 ,  H04R3/00 ,  H04R19/005 ,  H04R19/04 ,  H04R23/00 ,  H04R2201/003

摘要： Amplifier arrangements for read-out of MEMS capacitive transducers, such as low-noise amplifiers. An amplifier circuit has first and second MOS transistors, with the gate of the first transistor driven by the input signal, and the gate of the second transistor driven by a reference. The sources of the first and second transistors are connected via an impedance. Modulation circuitry is arranged to monitor a signal with a value that varies with the input signal and to modulate the back-bias voltage between the bulk and source terminals of the first and second transistors with the applied modulation being equal for each transistor and based on said monitored signal. The back-bias of the first transistor can be increase to extend the input range of the transistor in situations where the input signal may otherwise result in signal clipping, while avoiding noise and power issues for other input signal levels. By applying an equal modulation to the back-bias of each transistor, there is no substantial modulation of the output signal.

摘要翻译： 用于读取MEMS电容式换能器（如低噪声放大器）的放大器装置。 放大器电路具有第一和第二MOS晶体管，第一晶体管的栅极由输入信号驱动，第二晶体管的栅极由参考电压驱动。 第一和第二晶体管的源极通过阻抗连接。 调制电路被布置为以具有随输入信号变化的值来监测信号，并且调制第一和第二晶体管的体源极和源极端之间的反向偏置电压，并且对于每个晶体管，施加的调制相等，并且基于所述 监控信号。 在输入信号可能导致信号削波的情况下，可以增加第一晶体管的反偏压以延长晶体管的输入范围，同时避免其他输入信号电平的噪声和功率问题。 通过对每个晶体管的反向偏置施加相等的调制，对输出信号没有实质的调制。

公开(公告)号：US20150002228A1

公开(公告)日：2015-01-01

申请号：US14078050

申请日：2013-11-12

申请人： QUALCOMM Incorporated

发明人： Wenchang Huang ,  Vijayakumar Dhanasekaran

IPC分类号： H03F1/30

CPC分类号： H03F1/305 ,  H03F3/187 ,  H03F3/3022 ,  H03F3/72 ,  H03F2200/03 ,  H03F2200/381 ,  H03F2200/411 ,  H03F2200/453 ,  H03F2200/456 ,  H03F2203/45136 ,  H03F2203/7236 ,  H03G3/348

摘要： An amplifier with improved noise reduction is disclosed. In an exemplary embodiment, an apparatus includes at least one capacitor configured to receive an adjustable current and generate a corresponding ramp voltage configured to control coupling between a main amplifier output and a secondary amplifier output. The apparatus also includes at least one comparator configured to adjust the adjustable current to generate the ramp voltage with selected ramp-up or ramp-down voltage characteristics.

摘要翻译： 公开了一种具有改进的降噪功能的放大器。 在示例性实施例中，一种装置包括至少一个电容器，其配置成接收可调电流并产生相应的斜坡电压，该斜坡电压被配置为控制主放大器输出和辅助放大器输出之间的耦合。 该装置还包括至少一个比较器，配置成调整可调电流以产生具有选定的斜升或斜降电压特性的斜坡电压。

公开(公告)号：US20140340147A1

公开(公告)日：2014-11-20

申请号：US14258687

申请日：2014-04-22

申请人： NXP B.V.

发明人： Han Martijn Schuurmans ,  Maarten van Dommelen

IPC分类号： H03G3/30 ,  H03F3/45

CPC分类号： H03G3/301 ,  G07C9/00309 ,  G07C9/00571 ,  G07C2009/00634 ,  G07C2009/00777 ,  G07C2009/00793 ,  H03F1/305 ,  H03F3/187 ,  H03F3/2171 ,  H03F3/45 ,  H03F3/45071 ,  H03F3/45973 ,  H03F2200/03 ,  H03F2203/45528 ,  H03F2203/45588

摘要： A true ground amplifier circuit in which a voltage sensor senses the output voltage and generates a binary output which indicates whether the output is above or below a threshold. A variable gain feedback system generates a feedback signal for combination with the digital input, thereby to provide offset cancellation. The variable gain is reduced over time to provide offset cancellation during an initial period of time of operation of the amplifier circuit. This provides offset cancellation during a start-up period, for example.

摘要翻译： 一种真正的地面放大器电路，其中电压传感器感测输出电压并产生指示输出是否高于或低于阈值的二进制输出。 可变增益反馈系统产生用于与数字输入组合的反馈信号，从而提供抵消消除。 随着时间的推移，可变增益被减小以在放大器电路的初始操作时间期间提供偏移消除。 例如，这在启动期间提供偏移消除。

公开(公告)号：US20140334647A1

公开(公告)日：2014-11-13

申请号：US14268135

申请日：2014-05-02

申请人： NXP B.V.

发明人： Derk Jan Hissink ,  Max Martin ,  Fred Mostert

IPC分类号： H03F3/217 ,  H03F3/45 ,  H04R1/00 ,  H03F3/185

CPC分类号： H03F3/2173 ,  H03F1/52 ,  H03F3/185 ,  H03F3/187 ,  H03F3/45179 ,  H03F3/45475 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/33 ,  H03F2203/21136 ,  H03F2203/45171 ,  H04R1/00

摘要： An amplifier has a dual bridge design with two bridge amplifiers. A mode switch enables them to be configured in a series amplification mode. The switching of the mode switch is dynamic and enables re-use of signal current thereby improving overall system efficiency. A delay to the mode switch closure is provided in the event of clipping of one of the amplifier outputs. This prevents large cross currents from flowing.

摘要翻译： 放大器具有双桥设计，具有两个桥式放大器。 模式开关使它们能够以串联放大模式进行配置。 模式开关的切换是动态的，并且能够重新使用信号电流，从而提高整体系统效率。 在削波一个放大器输出的情况下，提供模式切换闭合的延迟。 这可以防止大的交叉电流流动。

公开(公告)号：US08787598B2

公开(公告)日：2014-07-22

申请号：US12471427

申请日：2009-05-25

申请人： Paul G. Berg

发明人： Paul G. Berg

IPC分类号： H03F99/00 ,  H03F1/26

CPC分类号： H03F1/34 ,  H03F3/187 ,  H03F2200/03 ,  H03F2200/165 ,  H03F2203/45138 ,  H03F2203/45521 ,  H03F2203/45526

摘要： A dynamic sound enhancement system and method which produces non-linear dynamic gain, time domain offset, and damping control in relation to frequency components of an applied audio signal. The functions and characteristics of the system make it feasible to extend the ability of small speakers to distinctly reproduce natural low frequencies including bass and sub-bass frequencies concurrently with high frequencies. Further, the system provides customization of system characteristics for obtaining optimized sound quality, audibility, and sound perception from diverse sound producing devices, and which satisfies diverse user hearing needs and listening preferences.

摘要翻译： 一种动态声音增强系统和方法，其产生与所应用的音频信号的频率分量相关的非线性动态增益，时域偏移和衰减控制。 该系统的功能和特点使得小型扬声器能够在高频率下同时显现出包括低音和次低音频率在内的自然低频的能力。 此外，该系统提供用于获得来自不同声音产生设备的优化声音质量，可听性和声音感知的系统特性的定制，并且其满足不同的用户听力需求和听力偏好。