Patent ID: 8452246

Claim:
A transmitter, comprising: a transmission path configured to provide a radio frequency (RF) signal to an RF antenna, the transmission path comprising a polar modulator; analysis circuitry coupled between the transmission path and the RF antenna, wherein the analysis circuitry is configured to determine an impedance mismatch between the transmission path and the RF antenna; an antenna tuner coupled between the analysis circuitry and the RF antenna; and a feedback path coupling the analysis circuitry to the antenna tuner, wherein the feedback path is configured to carry a feedback signal from the analysis circuitry to the antenna tuner to reduce the determined impedance mismatch; wherein the analysis circuitry comprises: a directional coupler coupled between the polar modulator and the antenna tuner; first and second mixers having respective first inputs coupled to an output of the directional coupler and having respective second inputs to receive a local oscillator (LO) signal; a cordic coupled to the first and second mixers and configured to output magnitude and phase information based on outputs of the first and second mixers; and memory elements configured to store the magnitude and phase information from the cordic.