| 摘要 |
A feed forward amplifier for multiple frequency bands is provided to reduce power consumption by simplifying a structure for amplifying a plurality of frequency bands. A multiple frequency band signal processing circuit includes a linear signal path(20) composed by a delay line, variable frequency band vector adjustment paths(21a,21b), multiple frequency band amplifying units(22a,22b) for amplifying signals of the variable frequency band vector adjustment paths, a dividing unit(23) for dividing input signals into the linear signal path and the variable frequency band vector adjustment paths, and a combining unit(24) for combining the output of multiple frequency band amplifying units and the output of linear signal path. The first variable frequency band vector adjustment path includes a first variable frequency band extractor(25a) for extracting a first frequency band signal at a center frequency and a vector adjuster(26a) for adjusting amplitude and phase of the first frequency band signal. The second variable frequency band vector adjustment path includes a second variable frequency band extractor(25b) for extracting a second frequency band signal at a center frequency and a vector adjuster(26b) for adjusting amplitude and phase of the second frequency band signal.
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