| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplifier, along with a communication device, capable of operating with different frequencies and output power or modulation systems. SOLUTION: The power amplifier includes 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 SW2 having a single-pole terminal and two multi-throw terminals. In the amplifier, one of the multi-throw terminals of the first switch SW2 is connected to the input terminal of the first amplifier PA201, and the other of the multi-throw terminals of the first switch SW2 is connected to the input terminal of the passive circuit PC3. COPYRIGHT: (C)2011,JPO&INPIT
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