| 摘要 |
A non-linear digital-to-analog converter is disclosed, which realizes non-linear output with overlapped resistor string. The non-linear digital-to-analog converter includes 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, . . . 2N/2] and third and fourth reference voltages Vh2 and Vc2 from externally applied reference voltages Vref[0, . . . 2N/2-1] if N bit digital value is input, a resistor string block for outputting Vh[0, . . . 2N/2-1] number of level voltages, Vc[0, . . . 2N/2-1] number of level voltages, and V1[0, . . . 2N/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, . . . 2N/2-1] number of level voltages, a second analog conversion voltage V2 from the Vc[0, . . . 2N/2-1] number of level voltages, and a third analog conversion voltage V3 from the V1[0, . . . 2N/2-1] number of level voltages, and an output switching portion for selectively outputting any one of the first, second and third analog conversion voltages V1, V2 and V3.
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