Patent ID: 8891328

Claim:
An antifuse, comprising: a depletion mode metal oxide semiconductor field effect transistor (“MOSFET”) having a conduction channel and a metal gate overlying the conduction channel; and a cathode and an anode, each being electrically coupled to the gate and spaced apart from one another in a direction the gate extends, such that the antifuse is programmable by driving a programming current between the cathode and the anode to cause material of the metal gate to migrate away, wherein under appropriate biasing conditions, the gate is configured such that when the antifuse is unprogrammed, the conduction channel is turned on unless a voltage above a first threshold voltage is applied to the gate to turn off the conduction channel, and the gate being configured such that when the antifuse has been programmed, the conduction channel remains turned on even if a voltage above the first threshold voltage is applied between the gate and a source region of the MOSFET.