Multi-stage amplifiers to reduce pop noise
    1.
    发明申请
    Multi-stage amplifiers to reduce pop noise 有权
    多级放大器,以减少流行噪音

    公开(公告)号:US20060182265A1

    公开(公告)日:2006-08-17

    申请号:US11175784

    申请日:2005-07-05

    IPC分类号: H04M9/00

    摘要: An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low gm amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier (56) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit (58) drives an output transistor to discharge an AC coupling capacitor (20). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.

    摘要翻译: 用于语音或音频信号的放大器(50),特别是用于耳机应用的放大器(50)使用低电平放大器(54)来在开机时开始对输出节点(OUT)充电 相。 在对输出节点充电之后,使主放大器(56)能够放大声音或音频信号。 在断电时,采样和保持电路(58)驱动输出晶体管以对AC耦合电容器(20)进行放电。 因此,消除了输出节点处的峰值,并且不需要外部滤波电容器。

    Multi-stage amplifiers to reduce pop noise
    2.
    发明授权
    Multi-stage amplifiers to reduce pop noise 有权
    多级放大器,以减少流行噪音

    公开(公告)号:US08965010B2

    公开(公告)日:2015-02-24

    申请号:US11175784

    申请日:2005-07-05

    IPC分类号: H03F21/00 H03F1/30 H03F3/72

    摘要: An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low gm amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier (56) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit (58) drives an output transistor to discharge an AC coupling capacitor (20). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.

    摘要翻译: 用于语音或音频信号的放大器(50),特别是用于耳机应用的放大器(50)使用低gm放大器(54)来在开机阶段开始时对输出节点(OUT)充电。 在对输出节点充电之后,使主放大器(56)能够放大声音或音频信号。 在断电时,采样和保持电路(58)驱动输出晶体管以对AC耦合电容器(20)进行放电。 因此,消除了输出节点处的峰值,并且不需要外部滤波电容器。

    Amplifier with sample and hold output and low drive stage
    3.
    发明授权
    Amplifier with sample and hold output and low drive stage 有权
    具有采样和保持输出和低驱动级的放大器

    公开(公告)号:US09337780B2

    公开(公告)日:2016-05-10

    申请号:US11175785

    申请日:2005-07-05

    IPC分类号: H04B15/00 H03F1/30

    CPC分类号: H03F1/305

    摘要: An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low gm amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier (56) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit (58) drives an output transistor to discharge an AC coupling capacitor (20). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.

    摘要翻译: 用于语音或音频信号的放大器(50),特别是用于耳机应用的放大器(50)使用低gm放大器(54)来在开机阶段开始时对输出节点(OUT)充电。 在对输出节点充电之后,使主放大器(56)能够放大声音或音频信号。 在断电时,采样和保持电路(58)驱动输出晶体管以对AC耦合电容器(20)进行放电。 因此,消除了输出节点处的峰值,并且不需要外部滤波电容器。

    Track and hold circuit to reduce pop noise
    4.
    发明申请
    Track and hold circuit to reduce pop noise 有权
    跟踪和保持电路,以减少流行噪音

    公开(公告)号:US20060182266A1

    公开(公告)日:2006-08-17

    申请号:US11175785

    申请日:2005-07-05

    IPC分类号: H04M9/00

    CPC分类号: H03F1/305

    摘要: An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low gm amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier (56) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit (58) drives an output transistor to discharge an AC coupling capacitor (20). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.

    摘要翻译: 用于语音或音频信号的放大器(50),特别是用于耳机应用的放大器(50)使用低电平放大器(54)来在开机时开始对输出节点(OUT)充电 相。 在对输出节点充电之后,使主放大器(56)能够放大声音或音频信号。 在断电时,采样和保持电路(58)驱动输出晶体管以对AC耦合电容器(20)进行放电。 因此,消除了输出节点处的峰值,并且不需要外部滤波电容器。