Memristor
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The document discusses memristors, a type of semiconductor device theorized in 1971. Memristors regulate electrical current flow and can remember the amount of charge that has previously flowed through them. They have resistance that varies as a function of magnetic flux and charge. Unlike resistors, capacitors and inductors, memristors link charge and flux. Potential applications of memristors include non-volatile memory systems, low-power electronics, neural networks and brain-computer interfaces. While not yet commercially available, memristors could replace technologies like DRAM and hard drives by retaining data without power and generating less heat.
Memristor
- 1. Sharad Institute of Technology College of Engineering, Yadrav (Ichalkaranji) Presented by, Ms. Chetan D. Patil Department of Electrical Engineering A presentation on Memristors (A memristic theory of passive electrical component)
- 2. Contents: • History • Memristor and its electronic symbol • Theory and Analogy • Construction and Working • Memristance • Symmery of relationships • Benefits and Limitations • Applications • Memrister patents • Future technologies • References • Conclusion
- 3. History: • In 1971 by Professor Leon Chua University of California, Berkeley • In 2008, a team at HP Labs under R. Stanley Williams
- 4. Memrister: • Semiconductor device • Regulates flow of electrical current • Resistance varies as a function of flux and charge • Switch used to connect multiple inputs and outputs in a matrix • Remembers the amount of charge that has previously flowed through it Symbol:
- 5. Theory: • Functional relationship between magnetic flux linkage Φm(t) and the amount of electric charge that has flowed f(Φm (t), q(t)) = 0 Why so late? • Effect of Atomic-scale movement • Pop-up on Nano scale of William’s devices
- 6. Analogy: • Resistor = water pipe • Water = electric charge • Pressure = voltage • Flow of water = electric current • Small diameter = fast water flow • Large diameter = Slow water flow • Memrister expands or shrinks Ref: google/memristorbjbz
- 7. Construction: • 2 Platinum electrodes • Silicon dioxide and Titanium dioxide • Resistance dependency on polarity, magnitude and length • Array of 17 purpose-built oxygen- depleted titanium dioxide • Imaged by an atomic force microscope • Wires are about 50 nm (or 150 atoms) wide Ref: google/memristorbjbz
- 8. Working: • When voltage is applied • Movement of Oxygen atoms • Thinner and thicker material layer • Resistance change • When voltage turned off • Remembers memory
- 9. Memristance: • Property of memrister • Unit is Ohm • Resistance increases when charge flows in one direction • Resistance decreases when charge flows in opposite direction • Charge is stopped then it remembers the last resistance that it had
- 10. Symmetry of relationships: • Found while exploring symmetry between three fundamental passive linear circuit elements Voltage (V) Flux (Ø) Charge (q) Current (I) Resistors (v=Ri) Capacitors (q=Cv) Inductors (Ø=Li) Memristors (Ø=Mq) v= dØ/dt i= dq/dt Ref: google/memristorbjbz
- 11. Fundamental passive linear elements: Ref: google/memristorbjbz
- 12. Benefits: • Unique properties of resistor, inductor, capacitor • Capable of replacing D-RAM and hard drives • Retain memory without power • Less heat generation • Device storage of 100 gigabytes in a square centimeter • Quicker boot-up • Requires less voltage • Less power requirement • Greater resiliency • Good reliability • Energy-efficient memory chips
- 13. Limitations: • Commercially not available • Can give wrong patterns at the beginning • Less speed about 1/10th of D-RAM
- 14. Applications: • Non-volatile memory : • Retain memory states, and data, in power-off modes • Low-power and remote sensing applications: • Memcapacitors and meminductors allows storage of charge • Nano-scale low power memory • Distributed state storage
- 15. Memristor patents: • Programmable Logic • Neural Networks • Reconfigurable Computing • Brain-computer Interfaces • 3nm Memristors in fabrication
- 16. Future technological significance: • Pattern recognition • Crossbar latches instead transistors • Signal processing • Control systems • Used to do digital logic instead NAND
- 17. References: • http://spectrum.ieee.org/semiconductors/processors/how-we-found-the-missing-memristor • http://innovativeblood.blogspot.in/2011/02/memristor-missing-circuit-element.html • http://whatis.techtarget.com/definition/memristor • http://www.memristor.org/reference/research/13/what-are-memristors • http://www.channelregister.co.uk/2011/12/27/memristors_and_mouttet/ • http://thefutureofthings.com/4060-flexible-memristor-chips/ • http://www.vrg.utoronto.ca/~shortena/documents/memristor.pdf
- 18. Conclusion: We can use the memrister as a semiconductor device which regulates flow of electrical current through it and operates even after power cut-off. Its resistance varies as a function of flux and charge. It remembers the amount of charge that has previously flowed through it and this data can be used for next operation.
- 19. Thank you ….