Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Reexamination Certificate
2007-06-26
2007-06-26
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
C365S225700
Reexamination Certificate
active
11252180
ABSTRACT:
An antifuse programming, protection, and sensing device incorporates a control circuit to program and protect an antifuse. The antifuse, which is initially constructed as a low conductivity path, is programmable to a high conductivity path by application of an elevated voltage across terminals of the antifuse. Application of 0 volts to the VDDnode of a conduction control portion of the antifuse programming, protection, and sensing device allows an elevated voltage for programming to be applied to the antifuse. Upon application of a nominal working voltage to the VDDnode of the conduction control circuitry, the antifuse and an adjoining sense amplifier circuit are protected from overvoltage and tampering. The sense amplifier supplies a sense current to the antifuse, measures a voltage at an input to the antifuse, and determines a programmed state if a measured voltage level is low.
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patent: 6762819 (2004-07-01), Lee
patent: 2003/0234665 (2003-12-01), Smith et al.
Gosmain Vincent
Wich Mathew T.
Atmel Corporation
Le Dinh T.
Schneck Thomas
Schneck & Schneck
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