Adc, ic including the same, and adc method thereof

An integrated circuit comprising an ADC, wherein the ADC comprises:

• an input adjustment buffer stage;
• a sub-ADC;
• and
• a sample switch coupled between an output node of the input adjustment buffer stage and an input node of the sub-ADC;
• wherein when the sample switch is opened, the input adjustment buffer stage is configured to switch between a first work state and a second work state according to a predetermined rule, and adjust an input voltage signal of the input adjustment buffer stage based on transitions between the first and second work states;
• when the sample switch is closed, the input adjustment buffer stage is configured to provide an adjusted voltage signal to the input node of the sub-ADC, and the sub-ADC is configured to perform an analog-to-digital conversion onto the adjusted voltage signal.

An Analog-to-Digital Conversion (ADC) method, comprising:

• receiving an input voltage signal;
• adjusting the input voltage signal by switching between a first work state and a second work state according to a predetermined rule to generate an adjusted voltage signal;
• buffering and holding the adjusted voltage signal;
• and
• performing the Analog-to-Digital Conversion onto the buffered and held voltage signal.