Radio frequency circuit and communication device

A radio frequency circuit comprising:

• a first amplification device and a second amplification device;
• a first transformer having a first input-side coil and a first output-side coil;
• a second transformer having a second input-side coil and a second output-side coil;
• a signal output terminal to which an end of the first output-side coil is connected;
• a first circuit and a second circuit;
• and
• a phase shift line,
• wherein an end of the first input-side coil is connected to an output terminal of the first amplification device, another end of the first input-side coil is connected to ground, an end of the second input-side coil is connected to an output terminal of the second amplification device, and another end of the second input-side coil is connected to the ground,
• wherein another end of the first output-side coil is connected to an end of the second output-side coil, and another end of the second output-side coil is connected to the ground,
• wherein the phase shift line is connected between the output terminal of the first amplification device and the end of the first input-side coil or between the output terminal of the second amplification device and the end of the second input-side coil,
• wherein the first circuit has a first inductor and a first capacitor that are connected in series to each other,
• wherein the first inductor and the first capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the first amplification device and the end of the first input-side coil,
• wherein the second circuit has a second inductor, a second capacitor, and a third inductor, the second inductor and the second capacitor being connected in series to each other, the third inductor being connected in parallel to the second capacitor, and
• wherein the second inductor and the second capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the second amplification device and the end of the second input-side coil.

A radio frequency circuit comprising:

• a first amplification device, a second amplification device, a third amplification device, and a fourth amplification device;
• a first transformer having a first input-side coil and a first output-side coil;
• a second transformer having a second input-side coil and a second output-side coil;
• a signal output terminal to which an end of the first output-side coil is connected;
• a first circuit, a second circuit, a third circuit, and a fourth circuit;
• and
• a first phase shift line and a second phase shift line,
• wherein an end of the first input-side coil is connected to an output terminal of the first amplification device, another end of the first input-side coil is connected to an output terminal of the third amplification device, an end of the second input-side coil is connected to an output terminal of the second amplification device, and another end of the second input-side coil is connected to an output terminal of the fourth amplification device,
• wherein another end of the first output-side coil is connected to an end of the second output-side coil, and another end of the second output-side coil is connected to ground,
• wherein the first phase shift line is connected between the output terminal of the first amplification device and the end of the first input-side coil, and the second phase shift line is connected between the output terminal of the third amplification device and the other end of the first input-side coil, or
• the first phase shift line is connected between the output terminal of the second amplification device and the end of the second input-side coil, and the second phase shift line is connected between the output terminal of the fourth amplification device and the other end of the second input-side coil,
• wherein the first circuit has a first inductor and a first capacitor that are connected in series to each other,
• wherein the first inductor and the first capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the first amplification device and the end of the first input-side coil,
• wherein the second circuit has a second inductor, a second capacitor, and a third inductor, the second inductor and the second capacitor being connected in series to each other, the third inductor being connected in parallel to the second capacitor,
• wherein the second inductor and the second capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the second amplification device and the end of the second input-side coil,
• wherein the third circuit has a fourth inductor and a third capacitor that are connected in series to each other,
• wherein the fourth inductor and the third capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the third amplification device and the other end of the first input-side coil,
• wherein the fourth circuit has a fifth inductor, a fourth capacitor, and a sixth inductor, the fifth inductor and the fourth capacitor being connected in series to each other, the sixth inductor being connected in parallel to the fourth capacitor, and
• wherein the fifth inductor and the fourth capacitor are disposed in series on a path connecting the ground and a point on a path connecting the output terminal of the fourth amplification device and the other end of the second input-side coil.