Patent ID: 6614379
Filing Date: 2003-09-02
Classification: H03M

Abstract:
An analog-to-digital converter having an analog input voltage and a digital output, comprising:a reference conversion voltage output portion for converting the analog input voltage on the basis of a plurality of reference voltages to output a plurality of reference conversion voltages; an intermediate voltage generating portion coupled to receive the plurality of reference conversion voltages, the intermediate voltage generating portion having a predetermined number of non-linear resistance units respectively provided between a first reference conversion voltage and a second reference conversion voltage in pairs of a predetermined number of the plurality of reference conversion voltages to generate a plurality of intermediate voltages by resistance division using the predetermined number of non-linear resistance units; a voltage interpolator coupled to the intermediate voltage generating portion to generate a plurality of conversion voltages; and a digital data output portion coupled to the intermediate voltage portion to generate the digital output applying double interpolation to the plurality of conversion voltages, wherein the digital data output portion includes a plurality of comparators coupled to receive the plurality of conversion voltages to provide the digital output, wherein each of the predetermined number of non-linear resistance units comprises, a first input terminal connected to the first reference conversion voltage, a second input terminal connected to the second reference conversion voltage, a plurality of non-linear resistor elements having the same resistance value connected in series between the first and second input terminals.