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    • 34. 发明申请
    • Output power correction module for amplifiers in transmitters
    • 发射机放大器的输出功率校正模块
    • US20080085684A1
    • 2008-04-10
    • US11895725
    • 2007-08-27
    • Kerry B. PhillipsMichael L. HagemanRobert M. FisherPaul R. Andrys
    • Kerry B. PhillipsMichael L. HagemanRobert M. FisherPaul R. Andrys
    • H04B1/04H03G3/00
    • H03G3/004H03F1/0205H03F1/0222H03F1/3282H03F3/24H03F2200/451H03F2200/504
    • According to an exemplary embodiment, a transmitter system includes a power amplifier receiving a supply voltage and a supply current from a power control/current detection circuit, where the power amplifier drives a load impedance. The transmitter system further includes a power correction module configured to sample the supply current and to cause a change in a control voltage, which corrects the supply voltage in response to a change in the load impedance. The supply voltage is corrected to cause the power amplifier to have a substantially constant output power. The power correction module is further configured to output a corrected peak voltage determined by an average value of the supply current. The transmitter system further includes a predistortion module configured to determine the control voltage from a product of the corrected peak voltage and an amplitude modulation component and to output the control voltage to the power control/current detection circuit.
    • 根据示例性实施例,发射机系统包括从功率控制/电流检测电路接收电源电压和电源电流的功率放大器,其中功率放大器驱动负载阻抗。 发射机系统还包括功率校正模块,其被配置为对供电电流进行采样并且引起控制电压的变化,该控制电压根据负载阻抗的变化校正电源电压。 电源电压被校正以使功率放大器具有基本上恒定的输出功率。 功率校正模块还被配置为输出由电源电流的平均值确定的校正峰值电压。 发射机系统还包括预失真模块,其被配置为从校正的峰值电压和振幅调制分量的乘积确定控制电压,并将控制电压输出到功率控制/电流检测电路。