| 摘要 |
PROBLEM TO BE SOLVED: To obtain a higher output voltage in comparison with that of a parallel operation system by amplifying a high frequency signal without missing of any frequency within a setting frequency band despite of a band split system. SOLUTION: A high frequency signal given to an input terminal 1 is amplified by amplifier circuits 2, 3 and the amplified signal is fed to an output amplifier stage. An output signal from the amplifier circuit 3 is distributed into two; the one signal is fed to an output terminal 12 of the amplifier via a high pass filter 4, a delay circuit 6, an output amplifier circuit 8 and a high pass filter 10 in the output amplifier stage, and the other signal is fed to the output terminal 12 via a low pass filter 5, a delay circuit 7, an output amplifier circuit 9 and a low pass filter 11 and mixed with the one signal that is the high frequency signal. Furthermore, a gain at a crossover frequency between the path consisting of the high pass filters 4, 10 and the path consisting of the low pass filters 5, 11 is selected to be about -6 dB with respect to the gain of each pass band and a delay time of both the paths is adjusted to be equal at the crossover frequency by using the delay circuits 6, 7.
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