Data writing and reading apparatus and method for nonvolatile an

Details Data writing and reading apparatus and method for nonvolatile an Data writing and reading apparatus and method for nonvolatile an

1997-08-11

1999-05-25

Nelms, David

Static information storage and retrieval

Analog storage systems

36518901, G11C 2700

Patent

active

059075015

ABSTRACT:
A data writing apparatus is disclosed wherein an M-bit data word is converted into an analog data signal using maximum and minimum reference voltages and the analog data signal and the maximum and minimum reference voltages are stored in a nonvolatile memory. One embodiment of the present invention stores the analog data signal in a first nonvolatile memory cell by adjusting a threshold voltage of the memory cell to correspond to the analog data signal and stores the maximum and minimum reference voltages by similarly adjusting the threshold voltages of a second and third nonvolatile memory cell, respectively. A data reading apparatus is shown which reads an analog data signal and maximum and minimum reference voltages from a nonvolatile memory device and converts the analog data signal into an M-bit data word using the maximum and minimum reference voltages.

REFERENCES:
patent: 4890259 (1989-12-01), Simko
patent: 4989179 (1991-01-01), Simko
patent: 5388064 (1995-02-01), Khan

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