Patent ID: 8134409

Claim:
A radio frequency power amplifier which selects one path from paths according to a required output power and uses the selected path, each of the paths amplifying a signal, said radio frequency power amplifier comprising: an input terminal to which a radio frequency signal is applied; a first transistor, which amplifies the radio frequency signal applied to said input terminal; a second transistor, which amplifies the radio frequency signal applied to said input terminal; a first impedance conversion circuit connected to an output node of said second transistor; a first switch element connected to an output node of said first impedance conversion circuit; a second impedance conversion circuit; and a harmonic suppression circuit, wherein said output node of said first switch element is connected to said second impedance conversion circuit via said harmonic suppression circuit, and an output node of said first transistor is connected to said second impedance conversion circuit not via said harmonic suppression circuit.