Memistor
Amemistoris a nanoelectric circuitry element used inparallel computingmemory technology. Essentially, aresistorwith memory able to performlogic operationsand store information, it is a three-terminal implementation of thememristor.
History
[edit]While thememristoris defined in terms of a two-terminal circuit element, there was an implementation of a three-terminal device called amemistordeveloped byBernard Widrowin 1960. Memistors formed basic components of a neural network architecture calledADALINEdeveloped by Widrow.[1][2]The memistor was also used inMADALINE.
Essence
[edit]In one of the technical reports[3]the memistor was described as follows:
Like the transistor, the memistor is a 3-terminal element. The conductance between two of the terminals is controlled by the time integral of the current in the third, rather than its instantaneous value as in the transistor. Reproducible elements have been made which are continuously variable (thousands of possible analog storage levels), and which typically vary in resistance from 100 ohms to 1 ohm, and cover this range in about 10 seconds with several milliamperes of plating current. Adaptation is accomplished by direct current while sensing the neuron logical structure is accomplished nondestructively by passing alternating currents through the arrays of memistor cells.
Since the conductance was described as being controlled by the time integral of current as in Chua's theory of the memristor, the memistor of Widrow may be considered as a form of memristor having three instead of two terminals. However, one of the main limitations of Widrow's memistors was that they were made from an electroplating cell rather than as a solid-state circuit element. Solid-state circuit elements were required to achieve the scalability of theintegrated circuitwhich was gaining popularity around the same time as the invention of Widrow's memistor.
An article on ArXiv suggests that thefloating-gate MOSFETas well as other 3-terminal "memory transistors" may be modeled usingdynamical systemsequations in a similar fashion to the memristive systems ofmemristors.[4]
See also
[edit]References
[edit]- ^Youtube:widrowlms: Science in Action
- ^1960: An adaptive "ADALINE" neuron using chemical "memistors"
- ^Widrow, B.; Pierce, W. H.; Angell, J.B. (1961),"Birth, Life, and Death in Microelectronic Systems"(PDF),Technical Report No. 1552-2/1851-1
- ^Mouttet, Blaise (2010). "Memristive Systems Analysis of 3-Terminal Devices".arXiv:1012.5124[cond-mat.mes-hall].
External links
[edit]
Media related toMemistorsat Wikimedia Commons- Memistor - Research at Cisco
