Voltage regulator for a voltage pump in a DRAM

Details Voltage regulator for a voltage pump in a DRAM Voltage regulator for a voltage pump in a DRAM

1998-03-25

1999-09-21

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

363 60, G05F 110

Patent

active

059559144

ABSTRACT:
The Vpp generator for use in a dynamic random access memory has a pump circuit and a voltage regulator. The voltage regulator controls the pump circuit such that the pumped up voltage has a maximum predetermined value. The prior art Vpp regulator sets the pumped up voltage, Vpp, to approximately a supply voltage, Vcc, plus the threshold voltage of a memory cell access transistor. This level becomes very high when the supply voltage, Vcc, is high and may overstress the devices. The present invention regulates the pumped up voltage, Vpp, at a substantially constant voltage level for high supply voltages. This level is safe and will not cause overstress.

REFERENCES:
patent: 4673829 (1987-06-01), Gupta
patent: 5692843 (1997-12-01), Furuya
patent: 5729172 (1998-03-01), Tsukada
patent: 5747974 (1998-05-01), Jeon
patent: 5811990 (1998-09-01), Blodgett et al.
patent: 5831470 (1998-11-01), Park et al.

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