System and method for DC offset correction in transmit baseband

A method for calibrating a transmit path of a RF transceiver, the method comprising:

• when in a first mode:
• providing a calibration signal to a feedback path of a closed loop comprising a transmit path and the feedback path;
• determining a first DC offset associated with the feedback path based on a first feedback signal output by the feedback path in response to the provision of the first calibration signal;
• when in a second mode:
• providing a second signal to the closed loop, wherein the feedback path outputs a second feedback signal in response to the provision of the second signal;
• determining a second DC offset associated with the second feedback signal;
• determining a third DC offset associated with the transmit path based on the first and second DC offsets;
• and
• adjusting the second signal based on the third DC offset.

A radio frequency (RF) transceiver comprising:

• a transmit path comprising an output coupled to an RF antenna;
• a feedback path comprising an input coupled to the output of the transmit path;
• and
• a DC offset calibration module comprising a first input coupled to an output of the feedback path, a second input to receive a first signal and an output connected to an input of the transmit path, wherein the DC offset calibration module is operable to:
• determine a first direct current (DC) offset of a closed-loop path comprising the transmit path and the feedback path;
• and
• determine a second DC offset based on the feedback path exclusive of the transmit path.