Sense amplifier having variable sensing load for non-volatile me

Details Sense amplifier having variable sensing load for non-volatile me Sense amplifier having variable sensing load for non-volatile me

1994-09-16

1996-01-23

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Flip-flop used for sensing

365207, 365208, 365210, 36518909, G11C 2900

Patent

active

054870453

ABSTRACT:
A sensing circuit for a non-volatile memory operating from a supply voltage and comprising non-volatile memory cells and a non-volatile reference cell maintained in an un-programmed condition, the sensing circuit comprising means for determining the sensed current of a memory cell when accessed and comparing it with the reference current to determine whether the accessed memory cell is programmed or un-programmed. To allow opertion over a wide range of supply voltages, the sensing circuit comprises a scalable current mirror circuit connected to the reference and memory cells and providing a ratio, M, of reference current to sensed current that, in response to changes in the supply voltage, varies.

REFERENCES:
patent: 5132576 (1992-07-01), Park
patent: 5142495 (1992-08-01), Canepa
patent: 5142496 (1992-08-01), Van Buskirk
patent: 5297101 (1994-03-01), Tada et al.

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