Radio employing a self calibrating transmitter with reuse of receiver circuitry

A method for transceiving radio frequency (RF) signals including self calibrating transmitting of the RF signals, the method comprises:

• producing 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;
• mixing 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;
• producing 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;
• outputting the analog low IF signal or the baseband representation of the modulated RF signal based on a switch control signal;
• producing a first baseband digital signal from the analog low IF signal when the analog IF signal is outputted;
• producing a second baseband digital signal from the baseband representation of the modulated RF signal when the baseband representation of the modulated RF signal is outputted;
• producing a calibration signal based on an interpretation of the second baseband digital signal;
• and
• calibrating 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.

An apparatus for transceiving radio frequency (RF) signals including self calibrating transmitting of the RF signals, the apparatus comprises:

• processing module;
• and
• memory operably coupled to the processing module, wherein the memory includes operational instructions that cause the processing module to:
• produce 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;
• 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;
• produce 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;
• output the analog low IF signal or the baseband representation of the modulated RF signal based on a switch control signal;
• produce a first baseband digital signal from the analog low IF signal when the analog IF signal is outputted;
• produce a second baseband digital signal from the baseband representation of the modulated RF signal when the baseband representation of the modulated RF signal is outputted;
• produce a calibration signal based on an interpretation of the second baseband digital signal;
• and
• 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.