Device for controlling internal voltage

Details Device for controlling internal voltage Device for controlling internal voltage

2008-09-02

2008-09-02

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

Reexamination Certificate

active

11520560

ABSTRACT:
A device controls internal voltage. Increased reliability of a semiconductor memory device is obtained by increasing or decreasing a level of internal reference voltage according to change of the device. Fuse ROMs generate fuse signals having different levels according to a cutting condition of each fuse. A bit counter performs up/down counting operation in response to a count control signal after setting the fuse signals to initial values in response to a set signal and generates counter output signals which are higher or lower than the initial values by a counting number. A decoder decodes the counter output signals and activates one of switching signals. A reference voltage selector provides a trimming level of internal reference voltage in response to the switching signals and generating reference voltage.

REFERENCES:
patent: 5450030 (1995-09-01), Shin et al.
patent: 5767732 (1998-06-01), Lee et al.
patent: 6690525 (2004-02-01), Ruegg et al.
patent: 2004/0013026 (2004-01-01), Ryoo
patent: 2004-055107 (2004-02-01), None
patent: 1998-079496 (1998-11-01), None
patent: 10-2004-0038787 (2004-05-01), None

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