Patent ID: 6977604

Claim:
An analog-to-digital converter comprising a plurality of stages of conversion units each including: an AD conversion circuit which converts an input analog signal into a predetermined number of bits of digital value; a DA conversion circuit which converts the output of the AD conversion circuit into an analog signal; and a subtractor circuit which subtracts the output of the DA conversion circuit from the input analog signal, the plurality of stages of conversion units processing analog-to-digital conversion in respective predetermined bits in succession, wherein at least part of the plurality of stages of conversion units further include a circuit which feeds back the output of the subtractor circuit to the input of the AD conversion circuit, and repeat the feedback-based cyclic processing a predetermined number of times, and while the part of the stages convert a first input analog signal, the other of the stages convert a second input signal input at different timing, wherein the plurality of stages of conversion units each include a circuit which feeds back the output of the subtractor circuit to the input of the AD conversion circuit.