Static, low current sensing circuit for sensing the state of a f

Details Static, low current sensing circuit for sensing the state of a f Static, low current sensing circuit for sensing the state of a f

1995-09-29

1998-03-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

327546, 327541, 3652257, 326 38, G11C 1716, G01R 3102

Patent

active

057317330

ABSTRACT:
A fuse sensing circuit comprises a first branch includes a first sensing transistor, and a fuse coupled to the source of the first sensing transistor. The fuse has a programmed state characterized by a first resistance, and an unprogrammed state in which the fuse has a second resistance. A second reference branch is coupled to the first branch in a current mirror configuration and includes a second sensing transistor, and a predetermined reference resistance coupled to the source of the second sensing transistor. The reference resistance is matched to the fuse device in an un-programmed state. The potential at an output node coupled to the first sensing transistor is determined by the state of the fuse device, such that the potential of the output node is within a first voltage range if the fuse device is programmed, and a second voltage range if the fuse device is un-programmed.

REFERENCES:
patent: 4608530 (1986-08-01), Bacrania
patent: 4698589 (1987-10-01), Blankenship et al.
patent: 4730129 (1988-03-01), Kunitoki et al.
patent: 4837520 (1989-06-01), Golke et al.
patent: 5140554 (1992-08-01), Schreck et al.
patent: 5334880 (1994-08-01), Abadeer et al.
patent: 5384727 (1995-01-01), Moyal et al.
patent: 5384746 (1995-01-01), Giolma
patent: 5418487 (1995-05-01), Armstrong, II

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