Static information storage and retrieval – Analog storage systems
Patent
1991-06-19
1994-02-22
Hille, Rolf
Static information storage and retrieval
Analog storage systems
365185, H01L 2700
Patent
active
052894010
ABSTRACT:
An analog storage device employs an electrically erasable programmable transistor as its memory cell. The memory cell transistor has a source and a drain which are disposed spaced apart from each other on a semiconductive substrate to define a channel region therebetween, an insulated floating gate electrode which at least overlaps the channel region, and an insulated control gate electrode disposed above the insulated floating gate electrode. Minority carriers are allowed to tunnel between the channel region and the insulated floating gate. The amount of carriers to be stored on the floating gate electrode is controlled such that it is in proportion to analog data to be stored therein. A variation in the internal field of the transistor which may occur when its floating gate electrode is being charged with minority carriers is monitored. When a field variation is detected, a voltage for compensating for the detected field variation is applied to the control gate electrode, whereby the linearity of analog storage is ensured.
REFERENCES:
patent: 5179427 (1993-01-01), Nakayama et al.
patent: 5179537 (1993-01-01), Matsumoto
An Electrically Trainable Artificial Neural Network (ETANN) with 10240 "Floating Gate" Synapses, M. Holler, et al., IJCNN 1989.
Hille Rolf
Kabushiki Kaisha Toshiba
Potter Roy
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