Memory device with time-shifting based emulation of...

Details Memory device with time-shifting based emulation of... Memory device with time-shifting based emulation of...

2006-03-02

2008-03-18

Phung, Anh (Department: 2824)

Static information storage and retrieval

Read only systems

Resistive

C365S185180, C365S194000

Reexamination Certificate

active

07345905

ABSTRACT:
A memory device includes a plurality of memory cells and a comparison circuit that compares a set of selected memory cells with at least one reference cell having a threshold voltage. The comparison circuit includes a bias circuit that applies a biasing voltage having a substantially monotone time pattern to the selected memory cells and to the at least one reference cell, sense amplifiers that detect the reaching of a comparison current by a cell current of each selected memory cell and by a reference current of each reference cell, a logic unit that determines a condition of each selected memory cell according to a temporal relation of the reaching of the comparison current by the corresponding cell current and by the at least one reference current, and a time shift structure that time shifts at least one of said detections according to at least one predefined interval to emulate the comparison with at least one further reference cell having a further threshold voltage.

REFERENCES:
patent: 4495602 (1985-01-01), Sheppard
patent: 5903504 (1999-05-01), Chevallier et al.
patent: 5933366 (1999-08-01), Yoshikawa
patent: 6195283 (2001-02-01), Rolandi et al.
patent: 2004/0257876 (2004-12-01), Vimercati
patent: 1 164 597 (2001-12-01), None
patent: 1 473 732 (2004-11-01), None

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