Monday, August 16, 2010


Unlike all of the other variants described here, 1T DRAM is actually a different way of constructing the basic DRAM bit cell. 1T DRAM is a "capacitorless" bit cell design that stores data in the parasitic body capacitor that is an inherent part of Silicon on Insulator transistors. Considered a nuisance in logic design, this floating body effect can be used for data storage. Although refresh is still required, reads are non-destructive; the stored charge causes a detectable shift in the threshold voltage of the transistor.[17]

There are several types of 1T DRAM memories: The commercialized Z-RAM from Innovative Silicon, the TTRAM from Renesas and the A-RAM from the UGR/CNRS consortium.

Note that classic one-transistor/one-capacitor (1T/1C) DRAM cell is also sometimes referred to as "1T DRAM".

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