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468 条记录 (耗时 0.018 秒)

    Single stage buffer with filter
    52.
    发明授权
    Single stage buffer with filter 有权
    带过滤器的单级缓冲器

    公开(公告)号：US09590571B2

    公开(公告)日：2017-03-07

    申请号：US14041266

    申请日：2013-09-30

    申请人： Knowles Electronics, LLC

    发明人： Michael Jennings ,  Craig Stein ,  Dean Badillo

    IPC分类号： H04R3/00 ,  H03F3/16 ,  H03F3/185

    CPC分类号： H03F3/16 ,  H03F3/185 ,  H04R2410/00 ,  H04R2410/03 ,  H04R2410/07

    摘要： A single-stage buffer apparatus includes a first transistor, a second transistor, and a high pass filter network. The first transistor is configured to receive an input signal from a microphone. The second transistor is configured to operate as a cascode transistor. The high pass filter network is coupled to the first transistor and the second transistor. The second transistor electrically decouples the first transistor from an output of the single-stage buffer apparatus. A gate terminal of the second transistor is driven by the high-pass filter network, and the high-pass filter network is driven by the first transistor.

    摘要翻译： 单级缓冲装置包括第一晶体管，第二晶体管和高通滤波器网络。 第一晶体管被配置为从麦克风接收输入信号。 第二晶体管被配置为作为共源共栅晶体管工作。 高通滤波器网络耦合到第一晶体管和第二晶体管。 第二晶体管将第一晶体管与单级缓冲装置的输出电耦合。 第二晶体管的栅极端子由高通滤波器网络驱动，高通滤波器网络由第一晶体管驱动。

    Methods and circuits to reduce pop noise in an audio device
    53.
    发明授权
    Methods and circuits to reduce pop noise in an audio device 有权
    减少音频设备弹奏噪音的方法和电路

    公开(公告)号：US09577579B2

    公开(公告)日：2017-02-21

    申请号：US15057552

    申请日：2016-03-01

    申请人： STMicroelectronics (Shenzhen) R&D Co. Ltd

    发明人： Ru Feng Du ,  Qi Yu Liu

    IPC分类号： H03F1/02 ,  H03F3/217 ,  H03F3/21 ,  H03F3/185 ,  H03G3/34 ,  H04R3/00 ,  H03F1/30 ,  H03F3/183

    CPC分类号： H03F1/3205 ,  H03F1/0205 ,  H03F1/305 ,  H03F3/183 ,  H03F3/185 ,  H03F3/187 ,  H03F3/211 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/45179 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2203/21106 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03G3/345 ,  H03G3/348 ,  H04R3/002

    摘要： A class D amplifier receives and amplifies a differential analog signal which is then differentially integrated. Two pulse width modulators generate pulse signals corresponding to the differentially integrated analog signal and two power units generate output pulse signals. The outputs the power units are coupled to input terminals of integrators via a resistor feedback network. An analog output unit converts the pulse signals to an output analog signal. The differential integration circuitry implements a soft transition between mute/un-mute. In mute, the integrator output is fixed. During the soft transition, the PWM outputs change slowly from a fixed 50% duty cycle to a final value to ensure that no pop noise is present in the output as a result of mode change.

    摘要翻译： D类放大器接收并放大差分模拟信号，然后差分模拟信号被差分地积分。 两个脉冲宽度调制器产生对应于差分集成模拟信号的脉冲信号，两个功率单元产生输出脉冲信号。 功率单元的输出通过电阻反馈网络耦合到积分器的输入端。 模拟输出单元将脉冲信号转换为输出模拟信号。 差分积分电路实现静音/非静音之间的软转换。 静音时，积分器输出是固定的。 在软转换期间，PWM输出从固定的50％占空比缓慢变化到最终值，以确保由于模式更改导致输出中没有弹出噪声。

    Amplifier circuit for a two-wire interface
    54.
    发明授权
    Amplifier circuit for a two-wire interface 有权
    用于双线接口的放大器电路

    公开(公告)号：US09571046B2

    公开(公告)日：2017-02-14

    申请号：US13994677

    申请日：2011-12-07

    申请人： Thomas Fröhlich ,  Wolfgang Dünser

    发明人： Thomas Fröhlich ,  Wolfgang Dünser

    IPC分类号： H03F3/185 ,  H03F3/70 ,  H04R1/04 ,  H04R3/00 ,  H04R19/01

    CPC分类号： H03F3/185 ,  H03F3/70 ,  H03F2200/03 ,  H03F2200/48 ,  H04R1/04 ,  H04R3/00 ,  H04R19/016

    摘要： The invention relates to an amplifier circuit (10a, 10b) for a two-wire interface, comprising a first current path (1), comprising a voltage-controlled current source (T1) having a gate (GT1), which is connected to an input connection (E1) of the amplifier circuit. A second current path (2) of the amplifier circuit comprises a voltage-controlled current source (T2), which is connected in series with the second resistor (R2). The first resistor (R1) and a parallel connection of the first and second current paths (1, 2) are connected in series between an output connection (A) and a reference voltage connection (B) of the amplifier circuit. The amplifier circuit (10a, 10b) makes it possible to adjust the gain and to provide a supply voltage and a useful signal over a common conducting track (L).

    摘要翻译： 本发明涉及一种用于双线接口的放大器电路（10a，10b），包括一个第一电流通路（1），它包括一个具有栅极（GT1）的压控电流源（T1），它连接到一个 输入连接（E1）。 放大器电路的第二电流通路（2）包括与第二电阻器（R2）串联连接的压控电流源（T2）。 第一电阻器（R1）和第一和第二电流路径（1,2）的并联连接在放大器电路的输出连接（A）和参考电压连接（B）之间串联连接。 放大器电路（10a，10b）使得可以调节增益并且在公共导电轨道（L）上提供电源电压和有用信号。

    Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator
    55.
    发明授权
    Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator 有权
    使用与闭环调制器并联的开环调制器进行动态范围增强的系统和方法

    公开(公告)号：US09503027B2

    公开(公告)日：2016-11-22

    申请号：US14524867

    申请日：2014-10-27

    申请人： Cirrus Logic, Inc.

    发明人： Ramin Zanbaghi

    IPC分类号： H03F3/185 ,  H03F3/217 ,  H03K7/08 ,  H03F1/02 ,  H03F1/30

    CPC分类号： H03F1/0277 ,  H03F1/305 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/321 ,  H03F2200/324 ,  H03F2200/351 ,  H03F2200/432 ,  H03K7/08

    摘要： 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.

    摘要翻译： 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。

    CLASS-D AMPLIFIER
    57.
    发明申请
    CLASS-D AMPLIFIER 有权
    CLASS-D放大器

    公开(公告)号：US20160294326A1

    公开(公告)日：2016-10-06

    申请号：US14676411

    申请日：2015-04-01

    申请人： NXP B.V.

    发明人： Fré Jorrit Jorritsma ,  Mattheus Johan Koerts ,  Fred Mostert

    IPC分类号： H03F1/02 ,  H03F3/21 ,  H03F3/217 ,  H03F3/185

    CPC分类号： H03F1/0205 ,  H03F3/181 ,  H03F3/185 ,  H03F3/211 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/351 ,  H03F2203/21142

    摘要： One example discloses a class-D amplifier apparatus, comprising: an amplifier circuit, having a set of input terminals, a set of output terminals, a quiescent circuit configuration, and an active circuit configuration; an amplifier control device, coupled to the amplifier circuit; wherein the amplifier control device is configured to place the amplifier circuit in the quiescent circuit configuration before measuring a voltage between the set of output terminals; wherein the amplifier control device is configured to add the output terminals voltage from the set of input terminals before placing the amplifier circuit in the active circuit configuration.

    摘要翻译： 一个例子公开了一种D类放大器装置，包括：放大器电路，具有一组输入端子，一组输出端子，静态电路配置和有源电路配置; 放大器控制装置，耦合到放大器电路; 其中所述放大器控制装置被配置为在测量所述一组输出端子之间的电压之前将所述放大器电路放置在所述静态电路配置中; 其中所述放大器控制装置被配置为在将所述放大器电路置于所述有源电路配置之前，将所述输入端子组的输出端子电压相加。

    Amplifier device and method for activating an amplifier device or the amplifier unit
    58.
    发明授权
    Amplifier device and method for activating an amplifier device or the amplifier unit 有权
    用于激活放大器装置或放大器单元的放大器装置和方法

    公开(公告)号：US09438183B2

    公开(公告)日：2016-09-06

    申请号：US14371885

    申请日：2013-01-14

    申请人： Robert Bosch GmbH

    发明人： Fabian Hoffmeister

    IPC分类号： H03F1/14 ,  H03F3/185 ,  H03F1/30 ,  H03F3/217

    CPC分类号： H03F3/185 ,  H03F1/305 ,  H03F3/2171 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2203/21157 ,  H03F2203/21178

    摘要： Known types of amplifiers include so-called class D amplifiers, which first use a pulse-width modulator to convert an analog signal into a pulse-width modulated switching signal, which is then amplified and subsequently converted back into a continuously variable voltage via a filter. This type of amplifier is particularly energy-efficient and is therefore preferably used for high-power amplifiers. The invention relates to an amplifier device 1 comprising a control device (5), wherein the control device (5) has an input interface for an audio signal (2), and comprising an amplifier unit (9) for amplifying the audio signal (2, 8) downstream of the control device (5), wherein the control device (5) has a delay module (6) that is designed to transmit the audio signal (2), delayed by a delay value delta_t, to the amplifier unit (9) and to automatically and/or autonomously reduce the delay value delta_t from a starting value delta_t to a final value during an adaptation phase AP.

    摘要翻译： 已知类型的放大器包括所谓的D类放大器，其首先使用脉冲宽度调制器将模拟信号转换成脉冲宽度调制的开关信号，然后被放大并随后通过滤波器转换回连续可变电压 。 这种类型的放大器是特别节能的，因此优选地用于大功率放大器。 本发明涉及一种包括控制装置（5）的放大器装置1，其中控制装置（5）具有用于音频信号（2）的输入接口，并且包括用于放大音频信号（2）的放大器单元（9） ，8）在所述控制装置（5）的下游，其中所述控制装置（5）具有延迟模块（6），所述延迟模块被设计成将延迟了延迟值Δ_t的所述音频信号（2）发送到所述放大器单元 9），并且在适配阶段AP期间自动地和/或自主地将延迟值delta_t从起始值delta_t减小到最终值。