Patent ID: 8803613

Claim:
A power amplification apparatus comprising: a field effect transistor (FET) arranged within a package having an input terminal and an output terminal, and configured to power-amplify an input signal from the input terminal to a transmission signal, for a radio frequency (RF) band, including a first signal and a second signal which include a predetermined frequency difference and level difference, and supply the transmission signal to the output terminal; a first decoupling element configured to decrease an inductance component of the transmission signal output from the FET, and output a signal with decreased inductance component; a power supply circuit configured to supply a driving power to the FET within the package; a second decoupling element configured to cut an RF component from the output terminal for the power supply circuit; and a third decoupling element arranged in parallel between the first decoupling element and the second decoupling element, and configured to decrease an impedance of a drain bias circuit over a wide band while suppressing anti-resonance with the first decoupling element and the second decoupling element.