Patent ID: 7554410

Claim:
A power amplifier for amplifying an input signal having a fundamental frequency of which band width ranges between a first fundamental frequency F 1 and a second fundamental frequency F 2 , comprising: a power amplifier transistor for amplifying the input signal; and an output matching circuit for suppressing a harmonic component included in an output signal from the power amplifier transistor, wherein the output matching circuit includes: a first series resonant circuit including a first inductor and a first capacitor, which are connected in series to each other between an output end of the power amplifier transistor and a ground, and having a second-order harmonic frequency of the first fundamental frequency F 1 as a resonance frequency thereof; and a second series resonant circuit including a second inductor and a second capacitor, which are connected in series to each other between the output end of the power amplifier transistor and the ground, and having a second-order harmonic frequency of the second fundamental frequency F 2 as a resonance frequency thereof, the first inductor has an inductance of 1 nH or larger, and the second inductor has an inductance of 1 nH or lower.