Double read stage sense amplifier

Static information storage and retrieval – Read/write circuit – Flip-flop used for sensing

Reexamination Certificate

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C365S207000, C365S185210

Reexamination Certificate

active

07031212

ABSTRACT:
The present invention relates to a sense amplifier for reading a memory cell, comprising a read node linked directly or indirectly to the memory cell, a first active branch connected to the read node, comprising means for supplying a read current at the read node, and a data output linked to one node of the first active branch at which a voltage representative of the conductivity state of the memory cell appears. According to the present invention, the sense amplifier comprises a second active branch connected to the read node, comprising means for supplying, at the read node, a current that is added to the current supplied by the first active branch, such that the voltage representative of the conductivity state of the memory cell remains substantially stable upon a current draw at the read node. Application particularly to reading non-volatile FLASH and EEPROM type memory cells.

REFERENCES:
patent: 5175705 (1992-12-01), Iwahashi
patent: 5748015 (1998-05-01), Tam
patent: 5886925 (1999-03-01), Campardo et al.
patent: 6501697 (2002-12-01), Perner et al.
patent: 6590804 (2003-07-01), Perner
patent: 2002/0000841 (2002-01-01), Rai et al.

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