Patent ID: 8902092

Claim:
An analog-digital conversion circuit that converts an analog input signal into a digital output signal, the analog-digital conversion circuit comprising: a comparator including a first input terminal that receives the analog input signal; a controller configured to generate a first signal and a second signal in accordance with an output signal from the comparator; a first digital-analog converter configured to generate a first reference signal based on the first signal; a second digital-analog converter configured to generate a second reference signal based on the second signal; a first capacitive element including a first terminal that receives the first reference signal and a second terminal coupled to a second input terminal of the comparator; a second capacitive element including a first terminal that receives the second reference signal and a second terminal coupled to the second input terminal of the comparator; and a correction circuit configured to correct the first signal and the second signal to generate the digital output signal, wherein the first signal is an N1-bit digital signal, the second signal is an N2B-bit digital signal acquired by adding a Kbit correction signal to an N2A-bit signal, the controller is configured to sequentially set bit values of the first signal and bit values of the second signal in accordance with the output signal of the comparator, and the correction circuit is configured to generate the digital output signal of (N1+N2A) bits based on a sum of a value acquired by multiplying the N1-bit digital signal generated by the controller by 2^N2A and a value of the N2B-bit digital signal generated by the controller.