Patent ID: 9118337
Filing Date: 2015-08-25
Classification: G02F,H03M

Abstract:
1. An analog-digital converter converting input analog input signals to digital signals, the analog-digital converter, comprising: a plurality of comparators that receive comparison reference potentials different from one another and compare the comparison reference potentials and the received analog input signals; an encoder that encodes outputs of the plurality of comparators and outputs the digital signals; and a resistor ladder circuit that includes a plurality of resistors connected in series and resistance-divides a reference voltage to generate the comparison reference potentials and supplies the comparison reference potentials to the comparators through output nodes each positioned between the resistors, wherein the resistor ladder circuit includes a correction circuit that corrects a variation in the comparison reference potential that varies depending on positions of the output nodes to which the comparison reference potentials are supplied in the resistor ladder circuit and is caused by noise currents that the comparators generate by supplying a current corresponding to the positions of the output nodes in the resistor ladder circuit to each of the output nodes.