Mixed digital-analog memory devices and circuits for secure storage and computing

A method for operating a mixed digital-analog memory device, wherein the mixed digital-analog memory device includes:

• a plurality of memory cells arranged in a matrix;
• a plurality of word lines extended in a row direction, each of the memory cells coupled to one of the word lines;
• a plurality of bit lines extended in a column direction, each of the memory cells coupled to one of the bit lines;
• a word-line control circuit coupled to and configured to control the word lines;
• a first bit-line control circuit configured to control the bit lines and sense the memory cells in a digital mode, the first bit-line control circuit being coupled to a first end of each of the bit lines;
• and
• a second bit-line control circuit configured to bias the bit lines and sense the memory cells in an analog mode, the second bit-line control circuit being coupled to a second end of each of the bit lines, the second end being opposite to the first end,
• the method comprising:
• programming a first portion of the memory cells in the digital mode with the first bit-line control circuit;
• and
• programming a second portion of the memory cells in the analog mode with the second bit-line control circuit.

A method for storing a data comprising:

• storing the data in an analog mode in a first mixed digital-analog memory array, resulting in a first variation of the data;
• calculating a first correction value for compensating the first variation of the data;
• storing the first correction value in the first mixed digital-analog memory array in a digital mode;
• storing the data in the analog mode in a second mixed digital-analog memory array, resulting in a second variation of the data;
• calculating a second correction value for compensating the second variation of the data, the second correction value being different from the first correction value;
• and
• storing the second correction value in the second mixed digital-analog memory array in the digital mode.