Patent ID: 7474155
Filing Date: 2009-01-06
Classification: H03F

Abstract:
1. A power amplifier, comprising a plurality of amplification stages, wherein a first amplification stage in said plurality of amplification stages includes a first amplification element, a second amplification element connected in parallel to said first amplification element, and a first distortion compensation circuit adjusting distortion of a gain characteristic of said second amplification element, a second amplification stage in said plurality of amplification stages includes a third amplification element and a second distortion compensation circuit adjusting distortion of a gain characteristic of said third amplification element, a dependency characteristic of gain relative to output power is opposite between said first amplification element and said second amplification element having the gain characteristic adjusted by said first distortion compensation circuit, and a dependency characteristic of gain relative to output power is opposite between said first amplification stage and said third amplification element having the gain characteristic adjusted by said second distortion compensation circuit.