| 摘要 |
PROBLEM TO BE SOLVED: To obtain a feedforward amplifier where a pilot signal for adjusting signal cancel loop is not outputted together with an output signal and a large- scale configuration can be avoided even when a plurality of the amplifiers are connected in parallel. SOLUTION: Feedfoward amplifiers 34, 35 amplify distributed signals, and a combining circuit 36 combines the amplified signals and provides an output. On the other hand, a vector adjustment device 39 adjusts pilot signals for adjusting signal cancel loop generated by a pilot signal generating circuit 37 so that they have the same amplitude and a phase difference of 180 deg. degrees and they are injected to the feedfoward amplifiers 34, 35 and are cancelled in the output of the combining circuit 36.
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