| 摘要 |
A multi-tone signal amplifier topology and an amplifying method in which a first amplifier outputs a first signal having at least one fundamental frequency signal and a first distortion signal. A second amplifier outputs a second signal that has a fundamental frequency signal corresponding to each fundamental frequency signal of the first signal and a second distortion signal. Each fundamental frequency signal of the second signal is substantially in-phase with the corresponding fundamental frequency signal of the first signal, while the second distortion signal is substantially 180° out-of-phase with the first distortion signal. An output coupler combines the first and second signals to form a third signal having the corresponding fundamental frequency signals of the first and second signals constructively combined and a third distortion signal that is a difference between the first distortion signal and the second distortion signal. A detector, coupled to the third signal, generates a control signal applied to the second amplifier for adjusting at least one of an amplitude and a phase of the second distortion signal thereby minimizing the third distortion signal. The second amplifier circuit includes an adjust circuit that varies at least one of an amplitude and a phase of the input signal for the second amplifier in response to the control signal.
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