Power amplifier circuit

A power amplifier circuit, comprising:

• a first amplifier configured to amplify a radio frequency signal in both a first mode and a second mode, an output power of the power amplifier circuit being greater in the second mode than in the first mode;
• a second amplifier configured to amplify the radio frequency signal in the second mode;
• a first bias circuit configured to apply a first bias to the first amplifier in both the first mode and the second mode;
• and
• a second bias circuit configured to apply a second bias to the second amplifier in the second mode,
• wherein the first bias circuit comprise:
• a first transistor having a collector electrically connected to a power supply electric potential, an emitter electrically connected to the first amplifier, and a base electrically connected to a first current source, and
• a second transistor and a third transistor, each of the second transistor and the third transistor being diode-connected and connected in series between the base of the first transistor and a reference electric potential, and the second bias circuit comprise:
• a fourth transistor having a collector electrically connected to the power supply electric potential, an emitter electrically connected to the second amplifier, and a base electrically connected to a second current source, and
• a fifth transistor having a base electrically connected to the emitter of the fourth transistor, a collector electrically connected to the base of the fourth transistor, and an emitter electrically connected to the reference electric potential.