Calibration circuit and method, phase-shift circuit, radio-frequency transceiver circuit, radar and device

A calibration circuit for a phase shifter, the phase shifter being coupled to the calibration circuit, and the calibration circuit comprising a phase acquisition circuit and a phase calibration circuit, wherein:

• the phase acquisition circuit is coupled to the phase shifter, and is configured to acquire a radio frequency sample signal from the phase shifter, modulate the radio frequency sample signal through frequency mixing with a first baseband signal to obtain a modulation signal carrying an actual phase, down-convert the modulation signal to a baseband to obtain a second baseband signal carrying the actual phase, and output the second baseband signal;
• wherein the actual phase is a phase of a radio frequency signal output by the phase shifter;
• and the first baseband signal is an intermediate frequency signal or a low frequency signal with a preset initial phase;
• and
• the phase calibration circuit is coupled to the phase acquisition circuit, and is configured to receive the second baseband signal from the phase acquisition circuit, determine a phase deviation of the phase shifter by detecting a phase difference between a preset phase-shift phase and the actual phase carried in the second baseband signal, determine calibration phase information according to the phase deviation, store the calibration phase information, generate a phase-shift control signal according to the calibration phase information, and transmit the phase-shift control signal to the phase shifter;
• wherein the calibration phase information is the phase deviation, or compensation information determined according to the phase deviation.