Static, low current, low voltage sensing circuit for sensing the

Details Static, low current, low voltage sensing circuit for sensing the Static, low current, low voltage sensing circuit for sensing the

1995-12-29

1998-08-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

371 222, 327 50, H01H 3776

Patent

active

057899703

ABSTRACT:
A static, self-biased, low current sensing circuit for sensing the state of a fuse. A first branch includes a first sensing transistor, a first fuse coupled to a first terminal of the first sensing transistor, and a first load coupled to the opposite terminal of the first sensing transistor. The fuse has an unprogrammed state characterized by a first resistance, and a programmed 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, a predetermined reference resistance coupled to a first terminal of the second sensing transistor, and a second load coupled to the opposite terminal of the second sensing transistor. The reference resistance is matched to the fuse device in an un-programmed state. Combinatorial logic coupled to the first and second load devices receives a sense enable signal. The combinatorial logic operates to turn off the load devices such that current does not flow in the first and second branches if the sense enable signal is deasserted. The potential at an output node coupled to the first sensing transistor is determined by the state of the fuse device if the sense enable signal is asserted, 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: 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: 5384746 (1995-01-01), Giolma
patent: 5418487 (1995-05-01), Armstrong, II

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