| 摘要 |
An apparatus and method thereof to correct a reference voltage, Vref, include a first digital device and a second digital device to input/output digital data via a bus, an adjustable resistor providing a main supply voltage VDD, a fixed resistor, wherein the adjustable resistor and the fixed resistor generate a Vref correction by dividing the main supply voltage VDD. A Vref setup selecting part of the apparatus and method selects the Vref correction and a Vref controller changes a resistance value of the adjustable resistor according to a selection of the Vref correction through the Vref setup selecting part, determines an optimum resistance value of the adjustable resistor, and outputs an optimum Vref correction.
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