Patent ID: 7843369

Claim:
An analog-to-digital converter that is used for a receiver circuit of a communication device and performs calibration using a digital signal, the analog-to-digital converter comprising: an analog-to-digital conversion unit that converts an input analog signal into a digital signal; a calibration section that is connected to an output side of the analog-to-digital conversion unit; a digital output generating section that receives an output of the analog-to-digital conversion unit; and a transfer switch that is installed at an input side of the analog-to-digital conversion unit, wherein the transfer switch has a function that inputs either an analog input signal received by the receiver circuit or an analog signal for calibration, which is obtained by performing digital-to-analog conversion on a digital signal for calibration in a digital-to-analog converter in a transmitter circuit of the communication device, to the analog-to-digital conversion unit, wherein the calibration section is connected to an output of the digital output generating section, an output of the analog-to-digital conversion unit, and an input of the digital-to-analog converter, and wherein the calibration section has a function of acquiring parameters that calibrate the output signal of the analog-to-digital conversion unit, using the digital signal for calibration and an output digital signal of the analog-to-digital conversion unit obtained by inputting the analog signal for calibration to the analog-to-digital conversion unit.