Sense amplifier for flash memory

Details Sense amplifier for flash memory Sense amplifier for flash memory

1998-08-19

1999-12-07

Phan, Trong

Static information storage and retrieval

Floating gate

Particular biasing

36518525, G11C 1606

Patent

active

059994541

ABSTRACT:
The present invention is embodied in a method and apparatus for sensing the logic state of a flash memory cell utilizing a current mode sense amplifier circuit that is less susceptible to noise. The sense amplifier consists of a controlled current source with mirroring, an integrator and a comparator. In the sensing phase, a cell with a stored low logic level will cause a first current to flow. The first current will be mirrored by a second current. The second current is integrated and compared against a reference voltage to determine the logic state of the cell. By integrating and comparing the mirrored current, the sense amplifier circuit is less susceptible to spurious signals caused by noise.

REFERENCES:
patent: 4062000 (1977-12-01), Donnelly
patent: 5519348 (1996-05-01), Tanoi
patent: 5563827 (1996-10-01), Lee et al.
patent: 5621686 (1997-04-01), Alexis
patent: 5638322 (1997-06-01), Lacey
patent: 5701265 (1997-12-01), Calligaro et al.
patent: 5729492 (1998-03-01), Campardo
patent: 5748534 (1998-05-01), Dunlap et al.
patent: 5754010 (1998-05-01), Caravella et al.

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