| 摘要 |
A voltage reference circuit includes a current source unit, a voltage-difference creating unit, and a resistance ratio unit. The current source unit receives an input current source and produces two current sources in equal current. The voltage-difference creating unit includes a first MOS device and a second MOS device to respectively receive the two current sources, wherein the first MOS device and a second MOS device has a threshold voltage difference. The resistance ratio unit includes a first resistor and a second resistor coupled in cascade, wherein the threshold voltage difference is applied to the first resistor. By adjusting a ratio of the first resistor to the second resistor, the resistance ratio unit produces a voltage reference, which is also fed back to the current source unit to ensure that the first current source and the second current source are equal.
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