Driver output pad leakage current compensation

摘要

A device includes a sense circuit configured to detect a leakage current from a driver output pad. A current mirror responds to the sense circuit and compensates for the leakage current detected at the driver output pad. A scaled compensation circuit can supply compensation current to the current mirror.

主权项

1. A device, comprising:
a sense circuit configured to detect a leakage current from a driver output pad; and a current mirror configured to respond to the sense circuit and to compensate for the leakage current detected at the driver output pad; a scaled compensation circuit configured to supply compensation current to the current mirror and to offset the leakage current detected by the sense circuit at the driver output pad; wherein the scaled compensation circuit, the sense circuit, and the current mirror are configured to compensate for an output driver stage that is pulled to a positive rail voltage; and wherein the scaled compensation circuit comprises an NMOS pair of transistors that are scaled versions of a driver NMOS output stage.