Analog-to-digital converter

An analog-to-digital converter, comprising:

• a) a charge distribution and holding module configured to sample a to-be-converted signal, and to perform subtraction on the to-be-converted signal and a target reference voltage by charge distribution, in order to generate a positive-phase output voltage and a negative-phase output voltage on a first electric rail and a second electric rail, respectively, wherein a difference between the positive-phase output voltage and the negative-phase output voltage is equal to a difference between the to-be-converted signal and the target reference voltage;
• b) a common-mode voltage compensation module coupled with the first electric rail and the second electric rail, and being configured to inject common-mode charges to compensate the distributed charges of the charge distribution and holding module, and to reduce a difference between a common-mode output voltage of the charge distribution and holding module and an expected value;
• and
• c) a comparator configured to provide a logic signal based on a comparison between the positive-phase output voltage and the negative-phase output voltage, wherein the logic signal corresponds to a target digital signal of the analog-to-digital converter.