Patent ID: 6034630
Filing Date: 2000-03-07
Classification: H03M

Abstract:
An analog to digital converter comprising:a first comparison circuit including a plurality of first comparators for comparing levels of reference voltages obtained from a plurality of voltage division resistor elements connected in series and an input analog signal to be converted into a digital code, said first comparators outputting signals of a first level or a second level in response to a result of the comparison, and outputting signals of a meta-level intermediate the first and second levels when a difference between said analog signal and the reference voltage is a predetermined value or less;a second comparison circuit comprising a plurality of second comparators for comparing output signals of said first comparators constituting the first comparators constituting the first comparison circuit with a reference voltage set to said intermediate meta-level or less and outputting the signal of either of said first or second levels according to the result of the comparison; andan encoder for converting the output signal of said second comparison circuit to a digital code.