Power amplification circuit, radio-frequency circuit, and communication device

A radio-frequency circuit comprising:

• a power amplification circuit configured to amplify a power of a radio-frequency signal;
• and
• a control circuit configured to control the power amplification circuit,
• wherein the power amplification circuit comprises:
• a first transistor that has a first input terminal, a first output terminal, and a first ground terminal,
• a second transistor that has a second input terminal, a second output terminal, and a second ground terminal, the second input terminal of the second transistor being connected to the first input terminal of the first transistor, and the second output terminal of the second transistor being connected to the first output terminal of the first transistor,
• a first bias circuit connected to the first input terminal,
• a second bias circuit connected to the second input terminal, and
• a resistor connected between the second ground terminal and ground,
• wherein, a resistance value between the second ground terminal and ground is greater than a resistance value between the first ground terminal and the ground,
• wherein the power amplification circuit is configured to operate in a first power mode and in a second power mode, an output power of the power amplification circuit being lower in the second output mode than in the first power mode,
• wherein, when the control circuit causes the power amplification circuit to operate in the first power mode, the control circuit is configured to cause the first transistor to be supplied with a first bias from the first bias circuit, and is configured to prevent the second transistor from being supplied with a second bias from the second bias circuit, and
• wherein, when the control circuit causes the power amplification circuit to operate in the second power mode, the control circuit is configured to prevent the first transistor from being supplied with the first bias from the first bias circuit, and is configured to cause the second transistor to be supplied with the second bias from the second bias circuit.