| US 7,592,865 B2 | ||
| Power amplifier using power combiner | ||
| Changkun Park, Gyeongsangnam-do (Korea, Republic of); and Songcheol Hong, Daejeon (Korea, Republic of) | ||
| Assigned to Korea Advanced Institute of Science and Technology, Daejeon (Korea, Republic of) | ||
| Filed on Oct. 19, 2007, as Appl. No. 11/976,030. | ||
| Claims priority of application No. 10-2006-0115133 (KR), filed on Nov. 21, 2006. | ||
| Prior Publication US 2009/0009241 A1, Jan. 08, 2009 | ||
| Int. Cl. H03F 3/68 (2006.01) | ||
| U.S. Cl. 330—124R [330/195] | 12 Claims |
| 1. A power amplifier using a power combiner, wherein first and second amplifier units amplify and output radio frequency signals
having opposite phases and are respectively connected to one ends of a first transmission line and a second transmission line
of a first transmission line transformer,
third and fourth amplifier units amplify and output radio frequency signals having opposite phases and are respectively connected
to one ends of a third transmission line and a fourth transmission line of a second transmission line transformer,
the other ends of the second transmission line of the first transmission line transformer and the third transmission line
of the second transmission line transformer are connected to each other so as to be connected to ground,
the other end of the first transmission line of the first transmission line transformer is connected to one end of a fifth
transmission line of a third transmission line transformer,
the other end of the fourth transmission line of the second transmission line transformer is connected to one end of a sixth
transmission line of the third transmission line transformer,
the fifth transmission line of the third transmission line transformer is connected to ground via an output resistor, and
the sixth transmission line of the third transmission line transformer is connected to ground.
|