Patent ID: 7773959

Claim:
Quadrature radio frequency (RF) amplifier circuitry comprising a quadrature RF amplifier output network comprising: a quadrature RF power combiner comprising: an in-phase RF input adapted to receive a first in-phase RF input signal, and having an in-phase input impedance based on a first impedance and impedance transformation circuitry; a quadrature-phase RF input adapted to receive a first quadrature-phase RF input signal, and having a quadrature-phase input impedance based on the first impedance and the impedance transformation circuitry; a combined RF output adapted to provide a first RF output signal based on the first in-phase RF input signal and the first quadrature-phase RF input signal; and an isolation RF output adapted to provide an isolation RF output signal based on the first in-phase RF input signal and the first quadrature-phase RF input signal; the impedance transformation circuitry comprising: an impedance transformation input adapted to receive the first RF output signal; an impedance transformation output adapted to provide a second RF output signal, wherein the first impedance is presented to the impedance transformation output; and a plurality of series coupled transformation stages coupled between the impedance transformation input and the impedance transformation output, such that each impedance transformation stage comprises: a stage input; a stage output; a first stage inductive element coupled between the stage input and the stage output; and a stage capacitive element coupled between the stage output and a DC reference; and termination circuitry adapted to receive the isolation RF output signal.