Resources Contact Us Home
Memory system which enables storage and retrieval of more than two states in a memory cell

Image Number 7 for United States Patent #5808932.

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.

  Recently Added Patents
Weak acid recovery system for ethanol separation processes
DC/DC converter, power supply circuit, and semiconductor device
Non-volatile memory and method having efficient on-chip block-copying with controlled error rate
Methods and compositions for wound healing
Systems and methods for dynamically modifying subcriber service profile stored in home location register while roaming in wireless telecommunication networks
System for and method of remotely auditing inventoried assets
Binder for secondary battery providing excellent adhesion strength and cycle property
  Randomly Featured Patents
Image display device and image adjustment method
Semiconductor device and method of forming the same as well as a photo-mask used therein
Support bar for circuit boards
Method for drying slurry, rinse water and industrial effluent and/or residues
Tube flaring machine
Lift generation by counter-rotating line vortices
Combined face shield and headband
Bind tape used with bookbinding apparatus
Light fixture
Sprinkler elevating apparatus and method