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    • 10. 发明申请
    • Low voltage amplifier having a class-AB control circuit
    • 具有AB类控制电路的低压放大器
    • US20070200629A1
    • 2007-08-30
    • US10942433
    • 2004-09-16
    • Raul Perez
    • Raul Perez
    • H03F3/45
    • H03F1/02H03F3/3022H03F3/45183H03F3/45475H03F2200/471H03F2200/513
    • A low voltage amplifier having a class-AB control circuit which generates minimal or no surge current when the output of the amplifier clips to ground or the negative rail. The amplifier includes an input stage, a summing circuit, a class-AB control circuit and an output stage. The input stage connects to a first current source and couples to receive a pair of differential input signals to generate intermediate signals that are summed together using the summing circuit. A second current source supplies the summing circuit with current. The class-AB control circuit receives the summed signals from the summing circuit to provide control for the output stage which generates the amplifier result at the output of the amplifier which delivers current to drive an external load. Specifically, the class-AB control circuit is improved by the addition of a PMOS device connected in such a way to cut off the DC current path that is generated during the output stage clipping condition by a diode connected PMOS device and a NMOS sensing device both located near the output of the class-AB control circuit. Thereby, the additional PMOS device minimizes the surge current generated by the NMOS sensing device when the output of the amplifier clips to ground or the negative rail.
    • 具有AB类控制电路的低电压放大器,当放大器的输出端接地或负轨时,产生最小或无浪涌电流。 放大器包括输入级,求和电路,AB类控制电路和输出级。 输入级连接到第一电流源并耦合以接收一对差分输入信号,以产生使用求和电路相加在一起的中间信号。 第二个电流源向求和电路提供电流。 AB类控制电路接收来自求和电路的求和信号,以提供输出级的控制,该输出级在放大器的输出端产生放大器结果,该放大器的输出传递电流以驱动外部负载。 具体来说,通过添加PMOS器件来改善AB类控制电路,该PMOS器件以这样一种方式连接,以便通过二极管连接的PMOS器件和NMOS感测器件来截断在输出级限幅条件期间产生的DC电流通路 位于AB类控制电路的输出附近。 因此,当放大器的输出端接地或负轨时,附加PMOS器件最小化由NMOS感测器件产生的浪涌电流。