Power amplifier

A power amplifier comprising:

• an amplifier circuit comprising an amplifier transistor, the amplifier transistor having a base electrically connected to an input terminal and being configured to amplify a radio frequency input signal input to the input terminal;
• a bias circuit electrically connected to the base of the amplifier transistor, the bias circuit being configured to output a bias current to the base of the amplifier transistor;
• and
• a bias suppression circuit electrically connected to the input terminal, the bias suppression circuit being configured to suppress the bias current based on the radio frequency input signal;
• wherein the bias circuit comprises:
• a first transistor having a collector and a base that are electrically connected to a first node, and an emitter electrically connected to a second node, the first node being input with a current;
• a second transistor having a collector and a base that are electrically connected to the second node;
• and
• a third transistor having an emitter and a base electrically connected to the first node, the third transistor being configured to output the bias current from the emitter,
• wherein the bias suppression circuit is electrically connected to the second node, and is configured to draw a current from the second node of the bias circuit based on the radio frequency input signal,
• wherein the bias suppression circuit comprises a replica transistor configured to simulate an operation of the amplifier transistor, the replica transistor having a base electrically connected to the input terminal, the base being input with the radio frequency input signal, and
• wherein the bias suppression circuit is configured to draw a current from the second node of the bias circuit based on a current flowing through the replica transistor.