Wireless transceiver having in-phase quadrature-phase calibration function

A wireless transceiver having an in-phase quadrature-phase (IQ) calibration function, comprising:

• a transmitter including:
• a transmitter-end (TX) digital circuit configured to output a digital transmission signal;
• and
• a TX analog circuit coupled to the TX digital circuit, the TX analog circuit including:
• a digital-to-analog converter configured to convert the digital transmission signal into an analog transmission signal;
• a TX mixing circuit including:
• a TX in-phase path mixing circuit configured to be disabled in a receiver-end (RX) calibration process, and configured to be enabled in a TX calibration process to generate a TX in-phase path up-conversion signal according to a TX in-phase path signal originated from the analog transmission signal;
• and
• a TX quadrature-phase path mixing circuit configured to be disabled in the RX calibration process, and configured to be enabled in the TX calibration process to generate a TX quadrature-phase path up-conversion signal according to a TX quadrature-phase path signal originated from the analog transmission signal, wherein the TX in-phase path up-conversion signal and the TX quadrature-phase path up-conversion signal jointly form a radio-frequency (RF) transmission signal;
• and
• a TX RF front-end circuit including multiple RF transmitting circuits coupled between the TX mixing circuit and an antenna;
• a receiver including:
• an RX analog circuit including:
• an RX RF front-end circuit including at least one RF receiving circuit coupled between the antenna and an RX mixing circuit;
• the RX mixing circuit including:
• an RX in-phase path mixing circuit configured to generate an RX in-phase path down-conversion signal according to a reception signal, wherein the reception signal is originated from a predetermined signal in the RX calibration process, and the reception signal is originated from the RF transmission signal in the TX calibration process;
• an RX quadrature-phase path mixing circuit configured to generate an RX quadrature-phase path down-conversion signal according to the reception signal;
• and
• an analog-to-digital converter configured to convert the RX in-phase path down-conversion signal or a derivative signal of the RX in-phase path down-conversion signal into an in-phase path digital reception signal, and configured to convert the RX quadrature-phase path down-conversion signal or a derivative signal of the RX quadrature-phase path down-conversion signal into a quadrature-phase path digital reception signal;
• and
• an RX digital circuit configured to perform RX IQ calibration according to a first difference between the in-phase path digital reception signal and the quadrature-phase path digital reception signal in the RX calibration process, and the RX digital circuit configured to output a calibration reference to the TX digital circuit according to a second difference between the in-phase path digital reception signal and the quadrature-phase path digital reception signal in the TX calibration process to let the TX digital circuit perform TX IQ calibration according to the calibration reference;
• a signal generator configured to generate the predetermined signal in the RX calibration process;
• and
• a switch circuit including:
• a first switch circuit couped between the signal generator and the TX RF front-end circuit, the first switch circuit configured to be turned on in the RX calibration process and to be turned off in the TX calibration process;
• and
• a second switch circuit couped between the TX RF front-end circuit and the RX RF front-end circuit, the second switch circuit configured to be turned on in both of the RX calibration process and the TX calibration process.