Method for improving sensing margin of electrically programmable fuses

摘要

A method for determining the state of a programmable resistive memory element includes passing a first level of current through a fuse leg and a reference resistance leg of a test circuit including the programmable resistive memory element; detecting a differential signal developed between a reference node and a fuse node of the test circuit as a result of the first level of current; passing a second level of current through the fuse leg and the reference leg of a test circuit, the second level of current being higher than the first level of current so as to enable detection of trip resistance of the test circuit at a lower value than with respect to the first level of current; and detecting a differential signal developed between the reference node and the fuse node of the test circuit as a result of the second level of current.