Patent ID: 8493152

Claim:
A power amplifier comprising: first and second primary inductors arranged as a whole in a circular geometry over a substrate; first and second amplifier pairs provided corresponding to the first and second primary inductors, respectively, each amplifier pair including first and second amplifiers coupled, respectively, to two ends of a corresponding primary inductor, said first and second amplifiers amplifying and outputting to the corresponding primary inductor first and second signals given as differential input signals, a secondary inductor provided adjacent to the first and second primary inductors and arranged in a circular geometry and being magnetically coupled to the primary inductors to make an output; and a connection wiring electrically coupling middle points of the first and second primary inductors with each other, wherein one of the two ends of the first primary inductor and one of the two ends of the second primary are arranged close to each other, and another of the two ends of the first primary inductor and another of the two ends of the second primary are arranged close to each other.