Patent ID: 6819910
Filing Date: 2004-11-16
Classification: H04B

Abstract:
A radio having a self calibrating transmitter, the radio comprises:transmitter section that produces a modulated radio frequency (RF) signal based on an I component of a baseband signal, an I component of a transmitter local oscillation, a Q component of the baseband signal, and a Q component of the transmitter local oscillation; mixer operably coupled to mix the modulated RF signal with the I or the Q component of the transmitter local oscillation to produce a baseband representation of the modulated RF signal; analog receiver section that produces an analog low intermediate frequency (IF) signal based on a received RF signal, an I component of a receiver local oscillation, and a Q component of the receiver local oscillation; calibration switch module operably coupled to output either the analog low IF signal or the baseband representation of the modulated RF signal in accordance with a switch control signal; digital receiver section operably coupled to the calibration switch module, wherein the digital receiver section produces a first baseband digital signal from the analog low IF signal and produces a second baseband digital signal from the baseband representation of the modulated RF signal; calibration determination module operably coupled to produce a calibration signal based on an interpretation of the second baseband digital 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 section is reduced.