Antifuse circuit

Details Antifuse circuit Antifuse circuit

2007-05-29

2007-05-29

Nguyen, VanThu (Department: 2824)

Static information storage and retrieval

Read/write circuit

Differential sensing

C365S096000, C365S097000, C365S207000, C365S209000

Reexamination Certificate

active

11166139

ABSTRACT:
An antifuse circuit provides on a per bit basis a signal that indicates whether an MTJ (magnetic tunnel junction) antifuse has been previously programmed to a low resistance state in response to a program voltage. A sense amplifier provides the resistance state signal. A plurality of reference magnetic tunnel junctions are coupled in parallel and to the sense amplifier, each having a resistance within a range to provide a collective resistance that can be determined by the sense amplifier to differ from each resistance state of the MTJ antifuse. A write circuit selectively provides a current sufficient to create the program voltage when the write circuit is enabled to program the antifuse magnetic tunnel junction. Upon detecting a change in resistance in the MTJ antifuse, the write circuit reduces current supplied to the antifuse. Multiple antifuses may be programmed concurrently. Gate oxide thicknesses of transistors are adjusted for optimal performance.

REFERENCES:
patent: 6324093 (2001-11-01), Perner et al.
patent: 2006/0092689 (2006-05-01), Braun et al.

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