HALF-FLASH TYPE ANALOG-TO-DIGITAL CONVERTER CAPABLE OF CONVERTING DATA AT HIGH SPEED

A flash type analog-to-digital converter which generates a digital output signal in response to an analog input signal includes: a first comparator having a reference value being half of a level determining range against the input signal and determining whether the input signal is above or below the reference value; a first encoder for generating the most significant bits of the digital output signal from an output signal of the first comparator; a subtractor for producing a difference between the reference value and the input signal when the input signal is determined to be above the reference value by the first comparator; at least two second comparator for determining an output signal level of the subtractor; and a second encoder for generating the rest of the digital output signal other than the most significant bits from an output of the second comparators.