One-time programmable memory cell with shiftable threshold...

Details One-time programmable memory cell with shiftable threshold... One-time programmable memory cell with shiftable threshold...

2009-08-07

2011-11-01

Ho, Hoai (Department: 2827)

Static information storage and retrieval

Read only systems

C365S104000, C365S105000

Reexamination Certificate

active

08050076

ABSTRACT:
According to one exemplary embodiment, a one-time programmable memory cell includes an access transistor coupled to a shiftable threshold voltage transistor between a bitline and a ground, where the access transistor has a gate coupled to a wordline. The shiftable threshold voltage transistor has a drain and a gate shorted together. A programming operation causes a permanent shift in a threshold voltage of the shiftable threshold voltage transistor to occur in response to a programming voltage on the bitline and the wordline. In one embodiment, the access transistor is an NFET while the shiftable threshold voltage transistor is a PFET. In another embodiment, the access transistor is an NFET and the shiftable threshold voltage transistor is also an NFET. The programming voltage can cause an absolute value of the threshold voltage to permanently increase by at least 50.0 millivolts.

REFERENCES:
patent: 7593248 (2009-09-01), Xu et al.
patent: 7626845 (2009-12-01), Holder et al.

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