Patent ID: 8421539

Claim:
A power amplifier comprising: a first amplification path including a power amplification element having one or more power amplification stages, an output impedance modification element, and an output phase shift element being only one inductance, the output impedance modification element coupled between an output of a final stage of the power amplification element and a corresponding intermediate node, the output phase shift element coupled between the corresponding intermediate node and an output node; and a second amplification path including a power amplification element having one or more power amplification stages, an output impedance modification element, and an output phase shift element being only one capacitance, the output impedance modification element coupled between an output of a final stage of the power amplification element and a corresponding intermediate node, the output phase shift element directly coupled between the corresponding intermediate node and the output node that is common to the first and second amplification paths, the output impedance modification element being a separate structure from the output phase shift element in each amplification path allowing an impedance at each of the intermediate nodes to be substantially the same as an impedance at the output node.