Patent ID: 7855720
Filing Date: 2010-12-21
Classification: G09G,H03M

Abstract:
1. A digital-to-analog converter, comprising: a higher resistor string configured to generate a plurality of higher voltage values corresponding to higher-order bits of an input digital signal, respectively; a lower resistor string configured to generate a plurality of lower voltage values corresponding to lower-order bits of the input digital signal, respectively; an operational amplifier; a higher selector configured to select one higher voltage value corresponding to the higher-order bits from among said plurality of higher voltage values generated in said higher resistor string, and output the one higher voltage value thus selected to one input of said operational amplifier; a lower selector configured to select one lower voltage value corresponding to the lower-order bits from among said plurality of lower voltage values generated in said lower resistor string, and output the one lower voltage value thus selected to the other input of said operational amplifier; a first switch connected to an output of said higher selector; a higher capacitor connected between said first switch and the one input of said operational amplifier; a second switch connected between one electrode of said higher capacitor and an output of said operational amplifier; a third switch connected between the other electrode of said higher capacitor and the output of said operational amplifier; and a control circuit configured to control said first, second and third switches.