Methods and systems for calibrating a frequency-division duplexing transceiver

A method of operating a frequency-division duplexing transceiver, comprising:

• in a normal mode:
• providing a transmit local oscillator signal to a first mixer to up-convert a transmit signal, wherein the transmit local oscillator signal has a first frequency, and
• providing a receive local oscillator signal to a second mixer to down-convert a receive signal, wherein the receive local oscillator signal has a second frequency distinct from the first frequency;
• and
• in a calibration mode, providing either the transmit local oscillator signal or the receive local oscillator signal to the first and second mixers.

A non-transitory computer-readable storage medium storing instructions, which when executed by a processor in a communication device comprising a transceiver, cause the transceiver to:

• provide a transmit local oscillator signal to a first mixer to up-convert a transmit signal in a normal mode, wherein the transmit local oscillator signal has a first frequency;
• provide a receive local oscillator signal to a second mixer to down-convert a receive signal in the normal mode, wherein the receive local oscillator signal has a second frequency distinct from the first frequency;
• and
• provide either the transmit local oscillator signal or the receive local oscillator signal to the first and second mixers in a calibration mode.

A frequency-division duplexing transceiver, comprising:

• a first mixer to up-convert a transmit signal;
• a second mixer to down-convert a receive signal;
• means for selectively providing a transmit local oscillator signal or a receive local oscillator signal to the first mixer, wherein the transmit local oscillator signal has a first frequency and the receive local oscillator signal has a second frequency distinct from the first frequency;
• and
• means for selectively providing the transmit local oscillator signal or the receive local oscillator signal to the second mixer.