-
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
CPC分类号: H03F1/305 , H03F3/3022 , H03F3/72 , H03F2203/7227 , H03F2203/7231
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。
-
公开(公告)号:US08965010B2
公开(公告)日:2015-02-24
申请号:US11175784
申请日:2005-07-05
CPC分类号: H03F1/305 , H03F3/3022 , H03F3/72 , H03F2203/7227 , H03F2203/7231
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。
-
公开(公告)号:US09337780B2
公开(公告)日:2016-05-10
申请号:US11175785
申请日:2005-07-05
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。
-
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。
-
-
-