| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplifier amplifying and compositing differential signals and capable of suppressing harmonics. SOLUTION: The power amplifier 101 includes: first amplifiers 11, 12 for amplifying a first input signal and a second input signal, which are differential signals; a first coil 21 for receiving the first input signal and the second input signal amplified by the first amplifiers 11, 12; a second coil 22 magnetically coupled with the first coil 21 and outputting a composite signal of the amplified first input signal and second input signal; a third coil 23 magnetically coupled with the second coil 22; and a first capacitor 41 connected between both ends of the third coil 23. In the power amplifier, one end of the first capacitor 41 is connected to a ground node. COPYRIGHT: (C)2010,JPO&INPIT
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