Successive-approximation analog-to-digital converter

A successive-approximation analog-to-digital converter using a capacitance redistribution method, the converter comprising:

• an ADC control circuit;
• and
• an ADC body circuit configured to, under control of the ADC control circuit, convert an analog input signal into a digital output signal and output the digital output signal,
• wherein the ADC body circuit includes
• a CDAC that includes a main capacitor bank composed of a plurality of first capacitors connected in parallel and an auxiliary capacitor bank composed of a plurality of second capacitors connected in parallel, the auxiliary capacitor bank being connected to supply a corrected capacitance value for any of the plurality of first capacitors in the main capacitor bank,
• a comparator configured to output a bit signal based on a capacitance redistribution signal output according to capacitance redistribution by the CDAC in response to the analog input signal,
• a logic circuit configured to output the digital output signal in a predetermined format based on the bit signal output from the comparator, and
• a corrected capacitance value designation circuit configured to output a correction designation value to designate a corrected capacitance value to be supplied to the first capacitors in the main capacitor bank, wherein
• the corrected capacitance value designation circuit holds in advance at least two correction designation values at least one bit earlier in time as pre-correction designation values, selects one of the pre-correction designation values according to the bit signal fed back from the comparator, and calculates at least two latest correction designation values based on one of the selected pre-correction designation values.