Posted: Thu May 08, 2008 05:43 pm Post subject: Memristors. This seems fundamental, like the lever
Quote:
Memristor Will Mean No RAM Required in Computers!
An element, called memristor and invented by a scientist at Hewlett Packard, allows data to be stored in circuitry even after the power is switched off!
This invention, as is obvious, has a huge potential in electronics. Well, simply put, if this works out according to plan, no RAM will be needed in our computers! In addition, this could result in analog computers that process information the way the human brain does.
While using memristors, the memory will be a part of the circuitry rather than a separate module; this will save valuable space. It can make possible for computers to power up instantly, cell phones will go much longer without a charge, and no information will ever be lost in case of power failures or battery death. . . .
Memristors /memˈrɪstɚ/ ("memory resistors") are a class of passive ideal two-terminal circuit elements that maintain a functional relationship between the time integrals of current and voltage. This results in resistance varying according to the device's memristance function. Specifically engineered memristors provide controllable resistance useful for switching current. In other cases, memristance theory is used as a mathematical model for empirically observed phenomena. The definition of the memristor is based solely on fundamental circuit variables, similarly to the resistor, capacitor, and inductor. Unlike those more familiar elements, memristors may be described by any of a variety of time-varying functions. As a result, memristors do not belong to linear circuit models including time. A time-invariant memristor is simply a conventional resistor.[3]
Memristor theory was formulated and named by Leon Chua in a 1971 paper. Chua believed that a fourth device might exist to provide conceptual symmetry with the resistor, inductor, and capacitor. He also acknowledged that other scientists had already used fixed nonlinear flux-charge relationships.[4] However, it would be 37 years until April 30, 2008, when a team at HP Labs led by the scientist R. Stanley Williams would announce the discovery of a switching memristor. The Hewlett Packard memristor, based on a thin film of titanium dioxide, appears to be practical and ideal in its initial incarnation.[5][6][7] However, as of yet, none have been reported outside HP. Being much simpler than currently popular MOSFET transistor switches and also able to implement one bit of memory in a single device, memristors may enable nanoscale computer technology. (As they are passive, thus incapable of amplification, however, it is impossible to construct digital logic entirely from memristors.) Chua also speculates that they may be useful in the construction of artificial neural networks.[8] . . .
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