Abstract: A Doherty power amplifier of a wireless communication system is provided. The Doherty power amplifier includes a first stage including a first power amplifier and a second power amplifier. The Doherty power amplifier includes a second stage including a third power amplifier and a fourth power amplifier. The Doherty power amplifier includes a coupler between the first stage and the second stage. The Doherty power amplifier includes a load impedance connected to the second stage. A bias of the first power amplifier is applied differently from a bias of the second power amplifier. A bias of the third power amplifier is applied in the same manner as a bias of the fourth power amplifier.

Abstract: Disclosed is a system for developing a target application on target system in a cross development environment having a host system and a target system, the development system including: the target system having: a storage device; an input device; an output device; a source editing unit for creating, opening, editing, and saving a source program to the storage device; and a project management client unit for performing a function of creating, opening, modifying, building, executing, and closing a project, and controlling data transmission/reception and information storage; the host system having: a storage device; a cross compiling unit for building (cross-compiling and linking) the source program such that an executable program is created to be saved to the storage device, and transmitting a message of a building result to the project management server unit; and a project management server unit for storing the project information and the source program in the storage device of the host system, and performing