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    SELF-REGULATED REFERENCE FOR SWITCHED CAPACITOR CIRCUIT
    34.
    发明申请
    SELF-REGULATED REFERENCE FOR SWITCHED CAPACITOR CIRCUIT 有权
    用于开关电容器电路的自调节参考

    公开(公告)号：US20170077883A1

    公开(公告)日：2017-03-16

    申请号：US15166066

    申请日：2016-05-26

    Applicant: MediaTek Inc.

    Inventor： Wen-Hua Chang

    IPC: H03F3/45 ,  H03H7/00

    CPC classification number: H03F3/45686 ,  H03F1/083 ,  H03F1/30 ,  H03F3/005 ,  H03F3/45 ,  H03F3/45273 ,  H03F2200/151 ,  H03F2200/153 ,  H03F2200/159 ,  H03F2200/42 ,  H03F2200/75 ,  H03F2203/45012 ,  H03F2203/45061 ,  H03F2203/45156 ,  H03F2203/45221 ,  H03F2203/45244 ,  H03F2203/45514 ,  H03F2203/45546 ,  H03F2203/45551 ,  H03F2203/45616 ,  H03H7/004

    Abstract: A switched-capacitor circuit comprising a differential operational amplifier and a feedback circuit is described. In some embodiments, the feedback circuit may be configured to provide a reference voltage that is insensitive to temperature and/or process variations. In some embodiments, the feedback circuit may be configured to mitigate the time delay associated with one or more capacitors of the switched-capacitor circuit. The switched-capacitor circuit may be controlled by a pair of control signals. During a first phase, one or more capacitors may be charged, or discharged, through an input signal. During a second phase, the electric charge of the one or more capacitors may be retained.

    Abstract translation: 描述了包括差分运算放大器和反馈电路的开关电容器电路。 在一些实施例中，反馈电路可以被配置为提供对温度和/或过程变化不敏感的参考电压。 在一些实施例中，反馈电路可以被配置为减轻与开关电容器电路的一个或多个电容器相关联的时间延迟。 开关电容电路可以由一对控制信号控制。 在第一阶段期间，可以通过输入信号对一个或多个电容器进行充电或放电。 在第二阶段期间，可以保持一个或多个电容器的电荷。

    Integrated amplifier for driving acoustic transducers
    38.
    发明授权
    Integrated amplifier for driving acoustic transducers 有权
    用于驱动声学传感器的集成放大器

    公开(公告)号：US09054646B2

    公开(公告)日：2015-06-09

    申请号：US13808604

    申请日：2011-08-02

    Applicant: Germano Nicollini ,  Federico Guanziroli ,  Massimo Orio ,  Carlo Pinna

    Inventor： Germano Nicollini ,  Federico Guanziroli ,  Massimo Orio ,  Carlo Pinna

    IPC: H03F3/181 ,  H03F1/30 ,  H03F1/34 ,  H03F3/187 ,  H03F3/213 ,  H03F3/45 ,  H03H19/00

    CPC classification number: H03F3/181 ,  H03F1/30 ,  H03F1/34 ,  H03F3/187 ,  H03F3/213 ,  H03F3/45475 ,  H03F3/45968 ,  H03F3/45973 ,  H03F2200/03 ,  H03F2200/156 ,  H03F2200/271 ,  H03F2203/45136 ,  H03F2203/45156 ,  H03F2203/45212 ,  H03F2203/45512 ,  H03F2203/45514 ,  H03F2203/45534 ,  H03F2203/45544 ,  H03H19/004

    Abstract: The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal. Such filtering means is characterized in that it comprises an input element interposed between said intermediate terminals and the input end of the operational amplifier, and a feedback element connected between the input end and the output end of the same operational amplifier.

    Abstract translation: 本发明涉及一种用于驱动声换能器的电子集成放大器。 放大器包括用于接收输入信号的两个差分输入端子和第一和第二输出端子以向换能器提供输出信号。 此外，放大器包括具有包括差分输入的输入端和与第一和第二输出端可操作地相关联的输出端的运算放大器。 一对输入电阻分别将两个差分输入端子连接到两个中间端子。 一对反馈电阻分别将第一和第二输出端子连接到两个中间端子。 集成放大器还包括用于对输入信号进行高通滤波的装置。 这种滤波装置的特征在于它包括插入在所述中间端子和运算放大器的输入端之间的输入元件，以及连接在同一运算放大器的输入端和输出端之间的反馈元件。

    METHODS AND CIRCUITS TO REDUCE POP NOISE IN AN AUDIO DEVICE
    39.
    发明申请
    METHODS AND CIRCUITS TO REDUCE POP NOISE IN AN AUDIO DEVICE 有权
    减少音频设备中的POP噪声的方法和电路

    公开(公告)号：US20150071464A1

    公开(公告)日：2015-03-12

    申请号：US14478531

    申请日：2014-09-05

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.

    Inventor： Ru Feng Du ,  Qi Yu Liu

    IPC: H04R3/00 ,  H03G3/34

    CPC classification number: 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

    Abstract: 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.

    Abstract translation: D类放大器接收和放大差分模拟信号，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。

    Ultra low-frequency response, DC-blocked low-noise amplifier
    40.
    发明申请
    Ultra low-frequency response, DC-blocked low-noise amplifier 有权
    超低频响应，直流阻塞低噪声放大器

    公开(公告)号：US20060197597A1

    公开(公告)日：2006-09-07

    申请号：US11173507

    申请日：2005-07-01

    Applicant: Ravi Ananth

    Inventor： Ravi Ananth

    IPC: H03F3/45

    CPC classification number: H03F3/187 ,  H03F1/26 ,  H03F1/38 ,  H03F3/005 ,  H03F3/45183 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2203/45156 ,  H03F2203/45296 ,  H03F2203/45332 ,  H03F2203/45512 ,  H03F2203/45544 ,  H03F2203/45546 ,  H03F2203/45631 ,  H03F2203/45632 ,  H03F2203/45686

    Abstract: An amplifier circuit is disclosed that allows for practical integrated circuit implementation of a dc-blocked, low-noise differential amplifier capable of amplifying ultra low-frequency signals and amplitudes ranging upwards of a few microvolts. DC-blocking capacitors having a capacitance value close to that of the effective input capacitance of the low-noise amplifier's inputs can be used by incorporating a positive feedback mechanism that tracks any variations in the amplifier gain or integrated circuit's technology process and lowers or cancels the input parasitic capacitances. Advantageously, the parasitic capacitance of transistors, typically field effect transistors, located on an integrated circuit chip are used in the feedback mechanism. This reduces the capacitive voltage division loss of the signal at the input of the amplifier while still allowing for the use of very small values of dc-blocking capacitance. No other active elements other than the amplifier itself are required to attain a low area, integrated circuit implementation of a dc-blocked, yet ultra low-frequency high pass filtered, low-noise amplifier.

    Abstract translation: 公开了一种放大器电路，其允许实现一种直流阻塞的低噪声差分放大器的实际集成电路，该差分放大器能够放大超过几微伏范围的超低频信号和幅度。 具有接近低噪声放大器输入的有效输入电容的电容值的隔直电容器可以通过结合一个正反馈机制来使用，该正反馈机制跟踪放大器增益或集成电路技术过程中的任何变化，并降低或取消 输入寄生电容。 有利地，在反馈机制中使用位于集成电路芯片上的晶体管（通常为场效应晶体管）的寄生电容。 这降低了放大器输入端的信号的电容分压损耗，同时仍然允许使用非常小的直流阻塞电容值。 除了放大器本身之外，不需要其他有源元件来实现直流阻塞但是超低频高通滤波的低噪声放大器的低面积集成电路实现。

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