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    • 5. 发明申请
    • ORTHOGONAL SIGNAL TRANSMITTER
    • 正交信号发射器
    • WO00008774A1
    • 2000-02-17
    • PCT/EP1999/005510
    • 1999-07-28
    • H04L27/20H03F1/02H04B1/04H04J11/00H04L27/26
    • H03F1/0222H03F1/02H03F1/3223H03F3/24H04B2001/0441H04B2001/045
    • A transmitter for transmitting orthogonal signals comprises a power amplifier (112) having a transfer characteristic in which gain is substantially independent of applied bias voltage. A digital signal for transmission is monitored by a level detector (116) which determines the peak output power required from the power amplifier (112). This information is used by a power supply controller (122) to control the DC bias voltage applied to the power amplifier (112) so that the applied voltage is reduced for low signal levels and increased for high signal levels, thereby increasing the efficiency with which supplied power is converted to radiated power. The applied voltage may be changed for each output symbol, or may be continuously adapted to track the peak envelope power. This method of controlling the amplifier (112) may be used in conjunction with coding schemes for reducing the peak to mean power ratio.
    • 用于发送正交信号的发射机包括具有传输特性的功率放大器(112),其中增益基本上与所施加的偏置电压无关。 用于传输的数字信号由电平检测器(116)监测,电平检测器确定从功率放大器(112)所需的峰值输出功率。 该信息由电源控制器(122)用于控制施加到功率放大器(112)的DC偏置电压,使得施加的电压降低以用于低信号电平并且对于高信号电平而增加,从而提高效率 提供的功率转换为辐射功率。 可以针对每个输出符号改变所施加的电压,或者可以连续地适应于跟踪峰值包络功率。 这种控制放大器(112)的方法可以与用于降低峰均功率比的编码方案结合使用。
    • 6. 发明申请
    • TRANSITIONING FROM ENVELOPE TRACKING TO AVERAGE POWER TRACKING
    • 从包装跟踪到平均功率跟踪的转换
    • WO2014062902A1
    • 2014-04-24
    • PCT/US2013/065403
    • 2013-10-17
    • RF MICRO DEVICES, INC
    • KHLAT, NadimKAY, Michael R.ADEEB, Mohammad Ahsanul
    • H03F1/02H03F3/24H03F3/189H04B1/04
    • G05F1/46H03F1/0211H03F1/0227H03F1/3223H03F3/189H03F3/24H03F2200/102H03F2200/432H04B2001/0441
    • An envelope tracking power supply (26) and an offset capacitive element (CO) are disclosed. The offset capacitive element (CO) is coupled between a switching output and an analog output of the envelope tracking power supply (26), which operates in one of an envelope tracking mode, a transition mode, and an average power tracking mode. During the envelope tracking mode, the envelope tracking power supply (26) provides an envelope power supply signal using both the switching output and the analog output. During the transition mode, the envelope tracking power supply (26) drives the offset capacitive element (CO) from a first voltage to a second voltage, such that during a transition from the envelope tracking mode to the transition mode, the offset capacitive element (CO) has the first voltage, and during a transition from the transition mode to the average power tracking mode, the offset capacitive element (CO) has the second voltage.
    • 公开了一种包络跟踪电源(26)和偏置电容元件(CO)。 偏移电容元件(CO)耦合在包络跟踪电源(26)的开关输出和模拟输出之间,其以包络跟踪模式,转换模式和平均功率跟踪模式之一工作。 在包络跟踪模式期间,包络跟踪电源(26)使用开关输出和模拟输出两者提供包络电源信号。 在转换模式期间,包络跟踪电源(26)将偏移电容元件(CO)从第一电压驱动到第二电压,使得在从包络跟踪模式转换到转换模式期间,偏移电容元件 CO)具有第一电压,并且在从转换模式到平均功率跟踪模式的转变期间,偏移电容元件(CO)具有第二电压。