| 摘要 |
PURPOSE: A method and an apparatus for reducing distortion in a transmitter are provided to minimize the distortion introduced into a feed forward amplifier by a feed forward correction circuit. CONSTITUTION: A transmitter has a feed forward amplifier(208) for amplifying an input signal(301) to produce an amplified signal(313) that includes a distortion component. The transmitter determines an error signal based on the input signal(301) and the amplified signal(313), and amplifies the error signal to produce an amplified error signal(331) that includes an error signal distortion component. The transmitter combines the amplified error signal(331) with the amplified signal(313) to produce an output signal(321) that includes the error signal distortion component and a portion of the amplified signal distortion component. The transmitter determines a distortion component(343) of an attenuated version(332) of the output signal(321), and an energy of the determined distortion component. Based on the determined energy, the transmitter produces control signals(350,352) designed to minimize the energy of the distortion component(343) of the attenuated output signal and minimize distortion in the output signal.
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