Patent ID: 6900749

Claim:
An analog-to-digital conversion circuit having a multi-stage pipeline structure composed of a plurality of stages of circuits for converting an analog input signal to a digital output value, wherein each of the stages of circuits except the final stage includes: an analog-to-digital converter that converts an inputted analog signal into a digital signal; a digital-to-analog converter that converts the digital signal outputted from said analog-to-digital converter into an analog signal; and a differential amplifier circuit that amplifies the difference between the inputted analog signal and the analog signal outputted from said digital-to-analog converter, digital signals outputted from the analog-to-digital converters in said plurality of stages of circuits constituting said digital output value, a correction value for correcting an error of said digital output value due to a gain error of said differential amplifier circuit in at least one stage of circuit of said plurality of stages being preset for each value of the digital signal outputted from said analog-to-digital converter in a subsequent stage of circuit, said analog-to-digital conversion circuit comprising: a correction value output circuit that outputs a corresponding correction value based on the digital signal outputted from said analog-to-digital converter in said subsequent stage of circuit; and a correction circuit that corrects said digital output value based on the correction value outputted from said correction value output circuit.