Importance

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Abstract

The present disclosure relates to a compensation circuit for providing compensation over PVT variations within an integrated circuit. Using a low voltage reference current source, the compensation circuit generates directly, from an on-chip reference low voltage supply (V.sub.DD), a reference current (I.sub.ref) that is constant over PVT variations, whereas a detection current (I.sub.z) that is variable over PVT variations is generated by a sensing circuit, which is based on a current conveyor, from a low voltage supply (V.sub.DDE-V.sub.DD) applied across a single diode-connected transistor (M10) corresponding to a voltage difference between two reference low voltage supplies. Both currents (I.sub.ref, I.sub.z) are then compared inside a current mode analog-to-digital converter that outputs a plurality of digital bits. These digital bits can be subsequently used to compensate for PVT variations in an I/O buffer circuit.

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First Claim