NONVOLATILE SEMICONDUCTOR MEMORY DEVICE

摘要

PROBLEM TO BE SOLVED: To improve a data retention and to stabilize an operation of a nonvolatile semiconductor memory device which uses a MOS transistor.

SOLUTION: The nonvolatile semiconductor memory device comprises a first bit cell 10 including a first PMOS transistor 11 with its source and drain connected to be a control gate and a first NMOS transistor 13 sharing a floating gate 12 with the transistor 11, a second bit cell 20 including a second PMOS transistor 21 with its source and drain connected to be a control gate, and a second NMOS transistor 23 sharing a floating gate with the transistor 21, and a differential amplifier 30 which receives an input signal from each drain of the transistor 13 and the transistor 23.

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