| 摘要 |
According to one embodiment, a class-C power amplifier includes an amplifying element whose power supply voltage is expressed as Vdc and whose maximum current is expressed as Imax, a conduction angleθo of the amplifying element being less thanπ(rad), and load impedance of a fundamental wave being expressed as Z1=R1+j·X1 and load impedance of a 2nd harmonic being expressed as Z2=R2+j·X2 which are observed from a dependent current source of an equivalent circuit of the amplifying element, wherein a relationship between variables X1 and R1 is set to−R1<=X1<=R1, variable R1 is set to R1=Vdc/Imax·π·{1−cos(θo/2)}/{θo/2−sin(θo)/2}, and variable X2/X1 is set to X2/X1=−{θo/2−sin(θo)/2}/{sin(θ/2)−sin(1.5·θo)/3), or each of the variables is set thereto so as to become equal substantially.
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