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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。
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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。
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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。
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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。
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5.发明授权Switched-capacitor, fully-differential operational amplifier with high switching frequency 有权具有高开关频率的开关电容，全差分运算放大器公开(公告)号：US06417728B1
公开(公告)日：2002-07-09
申请号：US09887508
申请日：2001-06-22
申请人： Andrea Baschirotto , Paolo Cusinato
发明人： Andrea Baschirotto , Paolo Cusinato
IPC分类号： H03F114
CPC分类号： H03F3/45708 , H03F3/45183 , H03F2203/45461 , H03F2203/45511 , H03F2203/45594 , H03F2203/45666
摘要： Fully-differential, switched-capacitor circuit having a first and second input terminal, and including: an operational amplifier having a first and a second differential input, a first and a second output terminal and a bias control terminal; a feedback network, connected between the differential outputs and the input terminals, and having intermediate nodes connected to the differential inputs of the operational amplifier; and a control circuit, including a detection network and an error amplifier. The error amplifier has a first input receiving a desired common-mode voltage, and an output connected to the bias control terminal and supplying a control voltage. The detection network has a first and a second input connected directly, respectively, to the second input terminal of the operational amplifier, and an output connected to a second input of the error amplifier, and supplying a common-mode drive voltage.
摘要翻译： 具有第一和第二输入端的全差分开关电容器电路，包括：具有第一和第二差分输入的运算放大器，第一和第二输出端子和偏置控制端子; 反馈网络，连接在差分输出和输入端之间，并具有连接到运算放大器的差分输入的中间节点; 以及包括检测网络和误差放大器的控制电路。 误差放大器具有接收期望的共模电压的第一输入端和连接到偏置控制端子并提供控制电压的输出。 检测网络具有分别直接连接到运算放大器的第二输入端的第一和第二输入，以及连接到误差放大器的第二输入端的输出端，并提供共模驱动电压。
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公开(公告)号：US06351186B1
公开(公告)日：2002-02-26
申请号：US09564060
申请日：2000-05-03
IPC分类号： H03F345
CPC分类号： H03F3/45273 , H03F3/3028 , H03F3/45264
摘要： The invention relates to a Class AB operational amplifier providing both output gain enhancement and adaptative output bias. The operational amplifier includes first and second output terminals; a main differential stage having first and second differential inputs and a first differential output stage; a first adaptatively biased, boosted output stage coupling the first differential output stage to the output terminal. Each output stage includes a first NMOS output transistor having a control terminal, a first terminal coupled to the respective output terminal, and a second terminal, and includes a first output amplifier having a first input coupled to the second terminal of the first output transistor, a second input coupled to the first differential output stage to provide adaptative bias for the first boosted output stage, and an output coupled to the control terminal of the first output transistor.
摘要翻译： 本发明涉及一种提供输出增益增强和适应性输出偏置的AB类运算放大器。 运算放大器包括第一和第二输出端子; 主差分级具有第一和第二差分输入和第一差分输出级; 将第一差分输出级耦合到输出端的第一适应偏置的升压输出级。 每个输出级包括具有控制端的第一NMOS输出晶体管，耦合到相应的输出端的第一端和第二端，并且包括具有耦合到第一输出晶体管的第二端的第一输入的第一输出放大器， 耦合到所述第一差分输出级以提供所述第一升压输出级的适应偏置的第二输入以及耦合到所述第一输出晶体管的所述控制端的输出。
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7.发明授权Method of re-establishing the stability of a sigma-delta modulator and a circuit for implementing the method 有权重新建立Σ-Δ调制器的稳定性的方法和实现该方法的电路公开(公告)号：US06489907B2
公开(公告)日：2002-12-03
申请号：US09919509
申请日：2001-07-30
IPC分类号： H03M300
摘要： A method of re-establishing the stability of a sigma-delta modulator having a plurality of integrator stages in cascade and a quantizer, achieving very short resetting times, a bit sequence corresponding to an instability state of the modulator is defined, the bit-stream output by the modulator is monitored to check whether it includes the instability sequence and, if the instability sequence is detected, the last integrator stage is reset and one or more preceding integrator stages are reset, progressively, until the instability sequence is no longer detected.
摘要翻译： 定义了具有级联的多个积分器级的Σ-Δ调制器和量化器的稳定性的方法，实现非常短的复位时间，对应于调制器的不稳定状态的比特序列，比特流 监视调制器的输出以检查其是否包括不稳定性序列，并且如果检测到不稳定性序列，则最后一个积分器级被复位，并且一个或多个先前的积分器级逐步复位，直到不再检测到不稳定序列。
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8.发明授权Integrated structure with an analog unit supplied by an external supply voltage by means of a low-pass filter and driving elements 有权具有通过低通滤波器和驱动元件由外部电源电压提供的模拟单元的集成结构公开(公告)号：US06320458B1
公开(公告)日：2001-11-20
申请号：US09567789
申请日：2000-05-09
IPC分类号： G05F302
CPC分类号： H03L7/06 , G05F3/24 , H03L7/0995
摘要： An integrated circuit has a first external supply terminal and a second external supply terminal for applying an external supply voltage to the circuit. The integrated circuit includes an analog unit supplied by at least one internal supply voltage derived from the external supply voltage, a low-pass filter connected to the first external supply terminal and to the second external supply terminal, and a driver connected between the low-pass filter and the analog unit for supplying the at least one internal supply voltage.
摘要翻译： 集成电路具有用于向电路施加外部电源电压的第一外部电源端子和第二外部电源端子。 集成电路包括由外部电源电压导出的至少一个内部电源电压提供的模拟单元，连接到第一外部电源端子和第二外部电源端子的低通滤波器， 通过滤波器和用于提供至少一个内部电源电压的模拟单元。
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公开(公告)号：US08188676B2
公开(公告)日：2012-05-29
申请号：US13099855
申请日：2011-05-03
申请人： Paolo Cusinato , Frederic Ballin , Lorenzo Indiani , Philippe Perney , Gwenaelle Merrien , Francois Bauduin
发明人： Paolo Cusinato , Frederic Ballin , Lorenzo Indiani , Philippe Perney , Gwenaelle Merrien , Francois Bauduin
IPC分类号： G05F1/00
CPC分类号： H05B33/0848 , H05B33/0815 , H05B33/0827 , Y02B20/347 , Y10T307/352
摘要： At least some embodiments include a LED driver system. The system includes multiple branches of series-coupled LEDs, multiple current sources, and control logic. Each of the current sources is coupled to a separate branch of series-coupled LEDs. The control logic is coupled to the current sources, and is configured to regulate current through each branch based at least in part on a feedback voltage measured at a node in one of the branches.
摘要翻译： 至少一些实施例包括LED驱动器系统。 该系统包括串联LED的多个分支，多个电流源和控制逻辑。 每个电流源耦合到串联耦合LED的单独分支。 控制逻辑耦合到电流源，并且被配置为至少部分地基于在一个分支中的一个节点处测量的反馈电压来调节通过每个分支的电流。
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公开(公告)号：US20050052225A1
公开(公告)日：2005-03-10
申请号：US10657618
申请日：2003-09-08
申请人： Paolo Cusinato
发明人： Paolo Cusinato
CPC分类号： H03H11/1217 , H03H11/1291
摘要： A calibrated RC filter (4) includes a fully differential calibration circuit (10) and finite state machine (8) for determining processing variations in the resistive and capacitive components of a RC filter (6). The finite state machine controls tunable capacitors (7) in the RC filter (6) according to the results of the calibration. In order to provide a symmetrical coverage range, an asymmetrical correction code is used for the nominal case.
摘要翻译： 校准RC滤波器（4）包括用于确定RC滤波器（6）的电阻和电容分量的处理变化的全差分校准电路（10）和有限状态机（8）。 有限状态机根据校准结果控制RC滤波器（6）中的可调电容器（7）。 为了提供对称的覆盖范围，对于标称情况使用非对称校正码。
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