| 摘要 |
PROBLEM TO BE SOLVED: To propose a multi-band feed-forward amplifier for amplifying signals of multiple frequency bands which are separated from each other, with a little distortion. SOLUTION: A multi-band feed-forward amplifier is formed by: dividing and applying an input signal containing signals of multiple frequency bands to a linear signal path and N vector adjustment paths of a distortion detecting circuit; frequency band signal extractors provided in the N vector adjustment paths, respectively, for extracting signals of N frequency bands; adjusting the vectors of the output signals from the respective band signal extractors in N vector adjusters; amplifying the output signals from the N vector adjusters in a main amplifier; combining the amplified signals and the signal from the linear signal path, dividing and applying the combined output to a linear signal path and N distortion injection paths of a distortion canceling circuit; frequency band signal extractors provided in the N distortion injection paths, respectively, for extracting the signals of the N frequency bands; vector adjusters for adjusting the vectors of signals separated into the N frequency bands; an auxiliary amplifying part for amplifying the vector-adjusted N signals; and a combining part for combining the amplified signals and the signal from the linear signal path of the distortion canceling circuit. COPYRIGHT: (C)2005,JPO&NCIPI
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