Power amplifier circuit

A power amplifier circuit comprising:

• a first transistor configured to amplify a first signal input to a base or a gate of the first transistor;
• a bias circuit configured to supply a bias current or a bias voltage based on a control signal to the base or the gate of the first transistor;
• a second transistor configured to output a second signal, wherein a control current based on the control signal is supplied to a base or a gate of the second transistor, an emitter or a source of the second transistor is connected to a collector or a drain of the first transistor, and the second signal is output from a collector or a drain of the second transistor, the second signal being obtained by amplifying the first signal;
• and
• a first feedback circuit connected between the collector or the drain of the second transistor and the base or the gate of the second transistor.