| 摘要 |
PURPOSE: An RF linear power amplifier is provided to improve a non-linear distortion in a broad frequency band by using two or more pilot signals. CONSTITUTION: An RF linear power amplifier includes an amplification/compensation module(100), a compensation signal generation module(200), and a control module(300). The control module(300) includes a signal source(410a,410b), a power combiner(420), an RF switch(430), a mixer(440), a bandpass filter(450), a power detector(460), and a digital controller(470). The signal source(410a,410b) generates two or more pilot signals having different frequencies. The power combiner(420) is used for coupling the pilot signals to an RF input signal of the amplification/compensation module. The RF switch(430) is used for selecting one pilot signal and outputting the selected pilot signal as a local oscillation signal. The mixer(440) is used for multiplying a sampling signal of an RF output signal of the amplification/compensation module by the local oscillation signal of the RF switch. The bandpass filter(450) is used for filtering an output signal of the mixer. The power detector(460) is used for detecting a power level of the filtered signal. The digital controller(470) is used for outputting a control signal to control a gain and a phase of a compensation signal of the compensation signal generation module(200).
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