Apparatus and method for reading state of multistate non-volatil

Details Apparatus and method for reading state of multistate non-volatil Apparatus and method for reading state of multistate non-volatil

1996-10-24

1998-08-04

Nelms, David C.

Static information storage and retrieval

Floating gate

Multiple values

365208, 365168, G11C 702

Patent

active

057904537

ABSTRACT:
An apparatus determining the state of a multistate memory cell. The apparatus includes three sense amplifiers, each with an associated reference cell which produces a reference voltage for input to each of the sense amplifiers. The apparatus includes circuitry which allows the reference cell currents to be varied to produce the reference voltages or pairs of reference voltages needed to accurately determine the threshold voltage and hence state of a programmed or erased memory cell.

REFERENCES:
patent: 4653023 (1987-03-01), Suzuki et al.
patent: 5043940 (1991-08-01), Harari
patent: 5293560 (1994-03-01), Harari
patent: 5321655 (1994-06-01), Iwahashi et al.
patent: 5386388 (1995-01-01), Atwood et al.
patent: 5394362 (1995-02-01), Banks
patent: 5495442 (1996-02-01), Cernea et al.

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