Patent ID: 7911820
Filing Date: 2011-03-22
Classification: G11C

Abstract:
1. An apparatus for regulating electrical fuse (eFUSE) programming current in semiconductor devices, comprising: a current control generator configured to receive an input reference current through a first current path that includes a first group of reference fuses, the input reference current proportional to a desired eFUSE programming current; a second current path associated with the current control generator, the second current path including a reference programming FET and a second group of reference fuses; and a voltage comparator associated with the current control generator, with an output of the voltage comparator coupled to a gate terminal of the reference programming FET so as to adjust the gate voltage of the reference programming FET to equalize a first voltage across the first current path with a second voltage across the second current path; wherein the gate voltage of the reference programming FET is an output of the current control generator, coupled to corresponding gates of one or more selected programming devices of an eFUSE array such that each of the one or more selected programming devices sources the desired eFUSE programming current to a selected eFUSE to be programmed.