Patent ID: 7098721
Filing Date: 2006-08-29
Classification: G11C,H01L

Abstract:
1. An integrated circuit adapted for low voltage programming and differential sensing of an electronic fuse, the circuit comprising: an electronic fuse having a first terminal and a second terminal; a first transistor coupled to the first terminal, the first transistor configured to switch a programming voltage to the first terminal; a second transistor coupled to the second terminal of the electronic fuse, the second transistor active during both a programming operation and a sensing operation; a first dummy fuse coupled to the first terminal and coupled to a supply voltage, the dummy fuse configured to reduce a sensing current through the electronic fuse; a differential amplifier having a first input terminal coupled to the first terminal of the electronic fuse and a second input terminal coupled to a first voltage divider providing a reference voltage for the sensing operation; and a gating transistor coupled to the voltage divider, the gating transistor configured to be active during the sensing operation.