Negative voltage detection circuit offsetting fluctuation of det

Details Negative voltage detection circuit offsetting fluctuation of det Negative voltage detection circuit offsetting fluctuation of det

1998-02-24

2000-02-29

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 80, H03K 5153

Patent

active

060313978

ABSTRACT:
A negative voltage detection circuit has a detection level of which is independent from the threshold voltage of a MOS transistor incorporated into the memory device. The negative voltage detection circuit detects whether or not the output voltage of a charge pump has a desired level, and then a signal is output in accordance with the detection result. The negative voltage detection circuit detects the negative voltage by comparing the multiple of the negative voltage by -(1
) (n is a natural number) with a the positive inner reference voltage V.sub.ref. When the multiple and the reference voltage V.sub.ref are equal to each other, the negative voltage detection circuit determines that the negative voltage has the desired level. When the level of the output is lower than the desired level, the charge pump is stopped. Otherwise, a control signal is output to operate the charge pump so as to control the negative voltage at the desired level by the feed back control.

REFERENCES:
patent: 4709172 (1987-11-01), Williams
patent: 5208488 (1993-05-01), Takiba et al.
patent: 5220221 (1993-06-01), Casper
patent: 5666076 (1997-09-01), Fugere et al.
patent: 5708420 (1998-01-01), Drouot
patent: 5744998 (1998-04-01), Ito et al.
Basic Integrated Circuit Building Blocks, VLSI Design Techniques For Analog And Digital Circuits, pp. 366-377.

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