Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1992-05-14
1994-10-04
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
323315, H03M 138
Patent
active
053530284
ABSTRACT:
A differential fuse circuit 10 is disclosed herein. A first fuse 12 and a second fuse 14 are coupled to a supply potential V.sub.DD (e.g., five volts). Circuitry 16 and 18 for blowing the two fuses 12 and 14 is also provided. A current mirror 46 including a first leg and a second leg is also provided. The current mirror 46 is designed so that a current through the first leg will induce a current in the second leg. The first leg is coupled between the first fuse 12 and a reference potential V.sub.SS and the second leg is coupled between the second fuse 14 and the reference potential V.sub.SS. An output node 56 is provided between the second fuse 14 and the second leg of the current mirror 46. A differential sense circuit 24 may also be included between the fuses 12 and 14 and the current mirror 46. During operation, the output node is at a potential substantially near the reference potential when the first fuse has a resistance greater than the second fuse and the output node is at a potential substantially near the supply potential when the first fuse has a resistance less than the second fuse. Other systems and methods are also disclosed.
REFERENCES:
patent: 4364006 (1982-12-01), Makabe et al.
patent: 4399426 (1983-08-01), Tan
patent: 4608530 (1986-08-01), Bacrania
de Wit Michiel
Tan Khen-Sang
Donaldson Richard L.
Kesterson James C.
Matsil Ira S.
Texas Instruments Incorporated
Young Brian K.
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