Patent ID: 8477857

Claim:
A transmitter comprising: a baseband outputting components of an in-phase signal and components of a quadrature phase signal; a multiplexer receiving the components of the in-phase signal and the components of the quadrature-phase signal, and outputting a first signal, and a second signal; a first digital-to-analog converter receiving the first signal and converting the first signal into a first analog signal; a second digital-to-analog converter receiving the second signal and converting the second signal into a second analog signal; and a Chireix combiner, wherein the Chireix combiner includes a capacitor portion and an inductor portion, wherein the capacitor portion receives the first analog signal, and the inductor portion receives the second analog signal, wherein the multiplexer is configured to select a phase of the first signal to correspond to a phase of the in-phase signal or a phase of the quadrature-phase signal, and select a phase of the second signal to correspond to the phase of the in-phase signal or the phase of the quadrature-phase signal, to ensure that a phase difference between the second signal and the first signal matches only a single predeterminded phase difference of positive 90° or negative 90°, such that the Chireix combiner is optimized for efficiency.