| 摘要 |
A multiple reference voltages generation apparatus, which generates multiple reference voltages to an analog-to-digital converter (ADC), is provided. The apparatus includes a resistor-string and a control device. The resistor-string has a first terminal and a second terminal for connecting respectively with a first reference voltage and a second reference voltage. The resistor-string comprises a plurality of series-connected resistors which define a plurality of nodes for outputting the multiple reference voltages. A plurality of Bit-Decision-Node {n<2kxj>, where k=0, . . . (m-1), j is an odd positive integer and (2kxj) is smaller than 2m} determine accuracy of a corresponding output bit ak of the ADC. A corresponding reference voltage Vn<2kxj> is output at each Bit-Decision-Node. The control device adjusts the voltage Vn<2kxj> on Bit-Decision-Node n<2kxj> to make Vn<2kxj+BW(ak)>-Vn<2kxj> approximately equal to Vn<2kxj>-Vn<2kxj-BW(ak)>, wherein BW(ak) is the weight value of the bit ak.
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