| 摘要 |
PROBLEM TO BE SOLVED: To distribute a transmission signal and a reception signal to respective power amplifier circuits depending on their frequency band without using a switch. SOLUTION: A transmission signal received at a terminal 50 in the case of transmission is distributed to a frequency band A power amplifier circuit 20 when the frequency of the signal belongs to a frequency band A or distributed to a frequency band B power amplifier circuit 30 when the frequency of the signal belongs to a frequency band B by a frequency discriminator 10 consisting of two band pass filters, the signal is respectively amplified and outputted from a terminal 60 via a frequency discriminator 40. On the other hand, in the case of reception, a reception signal received at the terminal 60 is distributed to the frequency band A power amplifier circuit 20 when the frequency of the signal belongs to the frequency band A or distributed to the frequency band B power amplifier circuit 30 when the frequency of the signal belongs to the frequency band B by the frequency discriminator 40 consisting of two band pass filters, the signal is respectively amplified and outputted from the terminal 50 via the frequency discriminator 10. |
