| abstract |
A power amplifier is provided with a first amplifier PA2 having an input terminal and an output terminal, a passive circuit PC3 having an input terminal and an output terminal, and a first switch having a single-pole terminal and two multi-throw terminals. One of the multi-throw terminals of the switch SW2 is connected to the input terminal of the first amplifier PA201 and the other multi-throw terminal of the switch SW2 is connected to the input terminal of the passive circuit PC3. Therefore, a power amplifier and a communication device which operate at different frequencies, output power, or modulating systems are provided. |