Amplifier circuit and radio frequency circuit

An amplifier circuit comprising:

• a first output terminal and a second output terminal;
• a first amplifier, a second amplifier, and a third amplifier;
• a first transformer including a first input-side coil and a first output-side coil;
• a second transformer including a second input-side coil and a second output-side coil;
• a third transformer including a third input-side coil and a third output-side coil;
• a first transmission line connected to an output terminal of the first amplifier;
• a second transmission line connected to an output terminal of the second amplifier;
• and
• a third transmission line connected to an output terminal of the third amplifier, wherein
• a first end of the first input-side coil is connected to the output terminal of the first amplifier via the first transmission line;
• a second end of the first input-side coil is connected to a ground;
• a first end of the first output-side coil is connected to the first output terminal;
• a first end of the second input-side coil is connected to the output terminal of the second amplifier via the second transmission line;
• a second end of the second input-side coil is connected to the ground;
• a first end of the second output-side coil is connected to a second end of the first output-side coil;
• a first end of the third input-side coil is connected to the output terminal of the third amplifier via the third transmission line;
• a second end of the third input-side coil is connected to the ground;
• a first end of the third output-side coil is connected to a second end of the second output-side coil;
• and
• a second end of the third output-side coil is connected to the second output terminal.