Birch, Stewart, Kolasch & Birch, LLP
Semiconductor memory device and portable electronic apparatus including the same
A semiconductor memory device includes a controller programming a nonvolatile memory cell by applying a first pulse so that a charge amount smaller than a target charge amount is accumulated in the nonvolatile memory cell, a second pulse train so that a second charge amount smaller than the target charge amount and larger than the first charge amount is accumulated in the nonvolatile memory cell, and a third pulse train so that a third charge amount falling within an allowable error range of the target charge amount is accumulated. The semiconductor memory cell includes a gate electrode formed on a semiconductor layer via a gate insulating film, a channel region disposed under the gate electrode, diffusion regions disposed on both sides of the channel region and memory functional units formed on both sides of the gate electrode.
Sharp Kabushiki Kaisha
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Masaru Hiroshi Yoshifumi Yoshinao Akihide Yasuaki
Nawaki Iwata Yaoi Morikawa Shibata Iwase