| 摘要 |
PURPOSE: A compensating method and a circuit of non-linear distortion are provided to extract non-linear distortion with high accuracy regardless of a variation of the time and the ambient temperature in a high-power amplifier. CONSTITUTION: The non-linear distortion compensation circuit includes an electrically controllable voltage controlled attenuator(30) instead of the attenuator in the non-linear distortion extractor(1A). Further, the non-linear distortion compensation circuit includes a directional combiner/divider(40) for dividing an output signal of subtractor(14) into two signals. One of the divided signals from the directional combiner/divider(40) is provided to the phase adjuster(22), while the other divided signal is provided to a detector(50). The detector(50) converts the received non-linear distortion component signal into a DC(Direct Current) component, and provides the DC component to a control circuit(60). Based on the output signal of the detector(50), the control circuit(60) generates a control signal for automatically controlling an attenuation of the output signal of the high-power amplifier(12) such that the DC component output from the detector(50) becomes minimized. The control circuit(60) provides the generated control signal to the voltage controlled attenuator(30) to control an attenuation of the voltage controlled attenuator(30).
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