Patent ID: 8412032

Claim:
An analog-to-digital (A/D) conversion circuit that receives a plurality of analog signals and outputs digital signals corresponding to the analog signals, the A/D conversion circuit comprising: a plurality of A/D conversion units each of which converts input analog signals into digital signals; a switch unit that receives a first analog signal and a second analog signal among the plurality of analog signals, the switch unit alternately switching output destinations of the first analog signal and the second analog signal input in the same period to the plurality of A/D conversion units in each sampling cycle of the plurality of A/D conversion units; and an arithmetic unit that performs a differential operation between a result of addition of the digital signals output from the plurality of A/D conversion units to which the first analog signal is input and a result of addition of the digital signals output from the plurality of A/D conversion units to which the second analog signal is input, the arithmetic unit outputting a third digital signal corresponding to a result of the differential operation.