| 摘要 |
A system for providing a threshold voltage (V<SUB>T</SUB>) includes a V<SUB>T </SUB>extractor that extracts the V<SUB>T </SUB>for a MOS transistor relative to a first voltage rail. An inversion circuit inverts the extracted V<SUB>T </SUB>(e.g., V<SUB>T</SUB>+V<SUB>IN</SUB>) relative to a reference voltage that is intermediate the first voltage rail and a second voltage rail and provides an output corresponding to the V<SUB>T </SUB>(e.g., V<SUB>T</SUB>+V<SUB>IN</SUB>) relative to the second voltage rail. The relative voltages at the voltage rails generally will depend on whether the V<SUB>T </SUB>is being extracted for a p-channel MOS transistor or an n-channel MOS transistor. The V<SUB>T </SUB>can be employed to generate a ramp voltage across a capacitor formed of another MOS transistor.
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