Programming pulse with varying amplitude

Details Programming pulse with varying amplitude Programming pulse with varying amplitude

1997-12-01

1999-09-21

Nelms, David

Static information storage and retrieval

Floating gate

Particular biasing

36518533, G11C 1604

Patent

active

059562722

ABSTRACT:
A method of the present invention includes the step of applying a drain pulse to a drain of a flash cell. A gate pulse is applied to a control gate of the flash cell coincident with the drain pulse. The amplitude of the gate pulse is varied between a maximum and a diminished amplitude to form a series of modulated gate pulses. The modulated gate pulses have substantially similar maximum and diminished amplitudes. A width of a modulated gate pulse is substantially lower than a width of the drain pulse. An apparatus of the present invention includes a flash cell having a control gate, a floating gate, a drain, and a channel. A switchable charge pump is coupled to the control gate, and generates a modulated gate pulse. A power supply is coupled to the drain and generates a drain pulse. The modulated gate pulse is coupled to the control gate coincidently when the drain pulse is coupled to the drain. The width of the modulated gate pulse is substantially lower than the width of the drain pulse.

REFERENCES:
patent: 5598369 (1997-01-01), Chen et al.
patent: 5608679 (1997-03-01), Mi et al.
patent: 5617357 (1997-04-01), Haddad et al.
patent: 5751637 (1998-05-01), Chen et al.
patent: 5812458 (1998-09-01), Gotou

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