Programming analog memory cells for reduced variance after...

Details Programming analog memory cells for reduced variance after... Programming analog memory cells for reduced variance after...

2011-01-04

2011-01-04

Pham, Ly D (Department: 2827)

Static information storage and retrieval

Floating gate

Multiple values

C365S185190, C365S185210, C365S185220, C365S185240, C365S185280

Reexamination Certificate

active

07864573

ABSTRACT:
A method includes defining a nominal level of a physical quantity to be stored in analog memory cells for representing a given data value. The given data value is written to the cells in first and second groups of the cells, which have respective first and second programming responsiveness such that the second responsiveness is different from the first responsiveness, by applying to the cells in the first and second groups respective, different first and second patterns of programming pulses that are selected so as to cause the cells in the first and second groups to store respective levels of the physical quantity that fall respectively in first and second ranges, such that the first range is higher than and the second range is lower than the nominal level. The given data value is read from the cells at a later time.

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