Patent ID: 6181265
Filing Date: 2001-01-30
Classification: H03M

Abstract:
A non-linear digital-to-analog converter comprising:a first reference voltage select switching portion for selectively outputting first and second reference voltages Vh1 and Vc1 from externally applied reference voltages Vref[1, . . . 2.sup.N/2 ] and third and fourth reference voltages Vh2 and Vc2 from externally applied reference voltages Vref[0, . . . 2.sup.N/2 -1] if N bit digital value is input;a resistor string block for outputting Vh[0, . . . 2.sup.N/2 -1] number of level voltages, Vc[0, . . . 2.sup.N/2 -1] number of level voltages, and V1[0, . . . 2.sup.N/2 -1] number of level voltages from any one of the reference voltages Vh1 and Vc1 and any one of the reference voltages Vh2 and Vc2;a second reference voltage select switching portion for outputting a first analog conversion voltage V1 from the Vh[0, . . . 2.sup.N/2 ] number of level voltages, a second analog conversion voltage V2 from the Vc[0, . . . 2.sup.N/2 -1] number of level voltages, and a third analog conversion voltage V3 from the V1[0, . . . 2.sup.N/2 -1] number of level voltages; andan output switching portion for selectively outputting any one of the first, second and third analog conversion voltages V1, V2 and V3.