Patent ID: 8144044
Filing Date: 2012-03-27
Classification: G09G,H03M

Abstract:
1. A resistor string type D/A converter comprising: a higher-order resistor string that generates a plurality of higher-order analog voltages by dividing a voltage between a first reference voltage and a second reference voltage and outputs the plurality of higher-order analog voltages from a plurality of voltage drawing points; first higher-order switches each provided for a respective one of the plurality of voltage drawing points, a conductive state of the first higher-order switches being controlled based on a first higher-order control signal; a higher-order decoder that generates the first higher-order control signal according to a value of a higher-order bit of a digital signal and brings a pair of first higher-order switches corresponding to neighboring higher-order analog voltages among the first higher-order switches into conduction based on the first higher-order control signal, the digital signal indicating one value by a plurality of bits; a lower-order decoder that generates a lower-order control signal corresponding to a value of a lower-order bit of the digital signal; and a conversion unit that outputs a voltage between a pair of analog voltage values obtained through the pair of first higher-order switches based on the lower-order control signal.