Memory system which enables storage and retrieval of more than t

Details Memory system which enables storage and retrieval of more than t Memory system which enables storage and retrieval of more than t

1996-12-23

1998-09-15

Nelms, David C.

Static information storage and retrieval

Systems using particular element

Capacitors

365168, 365187, G11C 1124, G11C 1156

Patent

active

058089322

ABSTRACT:
A memory circuit which enables storage of more than two logic states in a memory cell. Since the additional logic states may be used to represent additional information bits, this memory circuit increases the number of bits that may be stored per memory cell, thereby increasing the storage density and reducing the cost per bit. The disclosed memory circuit comprises an analog-to-digital converter coupled to detect a current through a transistor in a memory cell. The current is determined by a charge stored on the transistor's gate. By enabling the current to be detected in discrete increments, it becomes possible to represent more than one bit of information with the charge stored in the memory cell. Usage of additional increments necessitates more precise storage and detection circuitry. In one embodiment, the storage circuitry uses feedback to obtain a greater logic state retrieval accuracy.

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