Patent ID: 8502716

Claim:
An RFDAC (Radio Frequency Digital to Analog Converter) for conducting digital-to-analog conversion on a baseband signal, the RFDAC comprising: a multi-phase radio-frequency signal generator configured to generate multiple pairs of radio-frequency signals in which a phase difference among each of the multiple pairs is π; a vector selector configured to combine each of the multiple radio-frequency signals which has passed through at least one path; a test signal generator configured to generate a test signal; a multiplexer configured to select either the test signal or the baseband signal; a vector controller configured to control the vector selector so as to select a path for each of the multiple pairs of the radio-frequency signals by using a signal selected by the multiplexer; a detector configured to detect output signals outputted from the vector selector; and a calibrator configured to, when the multiplexer selects the test signal, calculate a calibration coefficient of a phase error between the radio-frequency signals of the each of the multiple pairs of the radio-frequency signals outputted by multi-phase radio-frequency signal generator, based on the output signals detected by the detector, and configured to, when the multiplexer selects the baseband signal, calibrate the multiple radio-frequency signals or the baseband signal by using the calibration coefficient.