Patent ID: 7110469

Claim:
A self-calibrating direct conversion transmitter, wherein the transmitter comprises: up-conversion mixing module that mixes an I component of a baseband signal with an I component of a local oscillation to produce a mixed I signal and mixes a Q component of the baseband signal with a Q component of the local oscillation to produce a mixed Q signal; summing module that sums the mixed I signal with the mixed Q signal to produce a modulated radio frequency (RF) signal; calibration determination module operably coupled to produce a calibration signal based on an interpretation of the local oscillation and the modulated RF signal; and calibration execution module operably coupled to calibrate at least one of: DC level of the I component of the baseband signal, DC level of the Q component of the baseband signal, gain of the I component of the baseband signal, and gain of the Q component of the baseband signal based on the calibration signal such that the imbalance within the transmitter is reduced, wherein the calibration execution module further comprises: an I component DC offset module operably coupled to adjust DC level of the I component of the baseband signal based on the calibration signal; an I component gain offset module operably coupled to adjust gain of the I component of the baseband signal based on the calibration signal; a Q component DC offset module operably coupled to adjust DC level of the Q component of the baseband signal based on the calibration signal; and a Q component gain offset module operably coupled to adjust gain of the Q component of the baseband signal based on the calibration signal.