High voltage negative charge pump with low voltage CMOS transist

Static information storage and retrieval – Read/write circuit – Erase

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3072966, 365900, G11C 700

Patent

active

053352009

ABSTRACT:
An improved negative charge pump system for erasing a memory array in a memory which has a supply voltage and a negative charge pump. The negative charge pump system includes (a) a device for selecting a memory array to be erased; (b) a device for switching on the supply voltage Vnn for the charge pump; (c) a device for pumping the supply voltage Vnn with the charge pump to produce a pumped negative voltage; (d) a device for erasing the selected array with the pumped negative voltage; (e) a device for stopping the pumping; and (f) a device for providing a discharge path for voltages trapped in the charge pump.

REFERENCES:
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patent: 5126808 (1992-06-01), Montalvo et al.
patent: 5168174 (1992-12-01), Naso et al.
patent: 5235544 (1993-08-01), Caywood
John F. Dickson, "On-Chip High-Voltage Generation in MNOS Integrated Circuits Using an Improved Voltage Multiplier Technique", Jun., 1976.
Witters et al., "Analysis and Modeling of On-Chip High-Voltage Generator Circuits for Use in EEPROM Circuits", Oct., 1989.

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