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    • 5. 发明授权
    • Power amplification apparatus of portable terminal
    • 便携式终端功率放大装置
    • US07345535B2
    • 2008-03-18
    • US10432553
    • 2002-02-04
    • Youngwoo KwonJunghyun KimSeong-Jun Bae
    • Youngwoo KwonJunghyun KimSeong-Jun Bae
    • H03F3/68
    • H03F1/0233H03F1/02H03F1/0205H03F1/0288H03F1/32H03F3/24H03F2200/102H03F2200/198H03F2200/423H03F2200/543H04B2001/045
    • The present invention relates to a power amplification circuit of a mobile device for improving the efficiency and the linearity properties of the power amplifier. In one embodiment, the power amplifier improves these properties by controlling the input voltage of the supplemental amplifier so that the power amplifier operates as the Doherty mode in the low output power mode depending on the magnitude of the output power from the output unit and so that the input voltage of the supplemental amplifier may be increased up to satisfy the non-linear operational requirements of a power amplifier in the high output power mode. Moreover, because only the input voltage of the supplemental amplifier is controlled, the power amplifier can be implemented in a simple manner. Thus, the size of the power amplifier becomes small, which in turn reduces the cost of the power amplifier, among other things.
    • 本发明涉及用于提高功率放大器的效率和线性特性的移动设备的功率放大电路。 在一个实施例中,功率放大器通过控制补充放大器的输入电压来改善这些特性,使得功率放大器根据来自输出单元的输出功率的幅度在低输出功率模式中作为Doherty模式工作,并且因此 可以增加补充放大器的输入电压,以满足高输出功率模式下的功率放大器的非线性操作要求。 此外,由于只有辅助放大器的输入电压被控制,功率放大器可以以简单的方式实现。 因此,功率放大器的尺寸变小,这又降低了功率放大器的成本。