Patent ID: 7825731

Claim:
An RF amplifying device comprising: a power transistor for generating transmission power to be fed to an antenna of a wireless device; and a transmission line transformer which uses an inductive capacitive coupling and which is thereby coupled to an output electrode of the power transistor, wherein the transmission line transformer includes a main line, and a secondary line, wherein the transmission power from the output electrode of the power transistor is fed to one end of the main line while one end of the secondary line is coupled to an AC grounding node, wherein the other end of the secondary line is coupled to the one end of the main line, thereby generating the transmission power to be fed to the antenna from the other end of the main line, wherein coupling energy is transmitted from the secondary line to the main line at an energy coupling part where the main line of the transmission line transformer is in close proximity of, and opposite to the secondary line, and wherein coupling members electrically coupled to the output electrode of the power transistor are electrically coupled to a joint formed in either the main line, or the secondary line, at part of the energy coupling part.