Patent ID: 7170299
Filing Date: 2007-01-30
Classification: G01R,G11C,H01L

Abstract:
1. A method for adjusting a fuse blow environmental variable of an electronic fuse on an integrated circuit chip, the electronic fuse including a poly silicon fuse link and a blow n-channel field-effect transistor (NFET) attached to each other, the method comprising: providing the electronic fuse, the electronic fuse being coupled to a fuse blow source voltage line, a fuse blow gate voltage line, and a chip ground; coupling a mimic NFET to the fuse blow source voltage line, the fuse blow gate voltage line, and the chip ground in same manner as the electronic fuse, except that the mimic NFET is not attached to any poly silicon fuse link; measuring an on current (ion) and an off current (ioff) of the mimic NFET under a preset value of the fuse blow environmental variable; determining a fuse blow current of the electronic fuse under the preset value of the fuse blow environmental variable based on a difference between the measured on current (ion) and off current (ioff) of the mimic NFET; and adjusting the preset value of the environmental variable based on the determined fuse blow current.