Analog-to-digital signal conversion method and apparatus therefor

An analog-to-digital signal conversion apparatus comprising:

• a signal conversion unit including N number of delay cells connected to each other in series and generating N number of delay signals from a predetermined input signal and an auxiliary delay cell connected in series to an Nth delay cell among the N number of delay cells;
• and
• a signal processing unit generating a first digital output signal having N number of bits by comparing each of the N number of delay signals with a reference signal, and generating a second digital output signal by comparing an auxiliary delay signal output by the auxiliary delay cell with the reference signal,
• wherein the signal processing unit determines a change in a delay time of each of the N number of delay cells based on the first digital output signal and the second digital output signal.