Static information storage and retrieval – Floating gate – Particular connection
Patent
1999-03-18
2000-03-14
Nelms, David
Static information storage and retrieval
Floating gate
Particular connection
3651852, 36518533, G11C 1604
Patent
active
060381698
ABSTRACT:
In this invention a reference circuit is disclosed that produces a reference current to be used in determining the value of data in a flash memory cell. The memory cell current is compared to the reference current in a sense amplifier. A reference circuit that generates the reference current is connect to each bit line of the flash memory and uses bit lines that are not activated when a particular cell is being read to connect the reference current to the sense amplifiers. The use of a reference current allows multi-bit cells to be read by using a variation on the reference circuit that has a plurality of reference transistors creating a plurality of reference currents.. Verification of the programmed and erase states of a flash memory cell can be determined using different values of the reference current that are easily set in the reference circuit by changing a reference voltage.
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Ogura Seiki
Ogura Tomoko
Ackerman Stephen B.
Auduong Gene N.
Halo LSI Design & Device Technology, Inc.
Nelms David
Saile George O.
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