Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: MemristorPrepared by:Jeremy HubbardDept. of Electrical and Computer Engineering Utah State UniversityE: [email protected];F: (435)797-3054 (ECE Dept.)3/7/2008DISCLAIMERThis device is not an actuator, but is a basic passive circuit element like a capacitor or an inductor. In the future it may be used in many actuators, but it is still in the development phase.03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Outline –Reference list–To probe further–Major applications–History of the memristor–Basic working principle illustrated–Describing equations–Types of memristors found–Limitations03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4Reference list•Memristor-The Missing Circuit Element, Leon O. Chua, Senior Member, IEEE, IEEE Transactions On Circuit Theory, Vol. ct-18, no. 5, September 1971•A Note on Memristors, George F. Oster, Letters To The Editor, IEEE Transactions On Circuit Theory, January 1974•http://www.hpl.hp.com/news/2008/apr-jun/memristor.html03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Reference list (cont)•Kriegerand, J.H.; Spitzer, S.M.: Non-traditional, non-volatile memory based on switching and retention phenomena in polymeric thin films •Pershin, Yuriy V; Di Ventra, Massimiliano (2008), "Spin memristive systems: Spin memory effects in semiconductor spintronics"03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6To explore further •R.Colin Johnson,“'Missing link' memristor created: Rewrite the textbooks?”, EETimes–http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=207403521•http://en.wikipedia.org/wiki/Memristor03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Major applications •Non-volatile RAM•Neural Synapse Model•Anything, the applications just need to be discovered03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8History of the memristor•1971- Dr. Leon O. Chua theorized the existence of a device and labeled it the memristor, he also built a device that simulates the behavior of a memristor and wrote the defining equations.•1976- Leon Chua and Sung Mo Kang publish "Memristive Devices and Systems" •1967-2007- many papers published by many different people noting the properties of memristance but no mention is made of a memristor03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9History of the memristor (cont)•2008- Dmitri Strukov, Gregory Snider, Duncan Stewart, and Stan Williams publish"The missing memristor found" in Nature journal, this is the first article which makes the connection between a memristor and the hysteretic switching noted by many throughout the years.•2008-present- Continued development and exploration of the memristor device and its associated properties.03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Basic Working PrincipleA memristor is a non-linear resistor, a resistor whose resistance changes over time based on the amount of current that has passed through it.PHOTO: R. Stanley Williams03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Basic Working Principle•As with a pipe example–A resistor is like a pipe whose diameter is constant and limits the water flow through it accordingly.–A memristor is like a pipe which has the property that if water flows through it in one direction the diameter shrinks and if it flows in the other direction it expands and once water stops flowing through it, it remains the same size until water starts flowing again.03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Describing equationsVoltage across a charge controlled memristorvt =M q t it 1WhereM q ≡ d q / d q 2Current of a flux−controlled memristorit=W t v t 3WhereW ≡dq / d 4Instantaneous po wer dissipatedby a memristo r :p t =v t i t= M qt [i t ]2503/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Types of memristors found•Titanium dioxide memristor–Doesn't use Magnetic Flux as suggested by Chua.–Uses a chemical medium which allows charge carriers to drift based on the current through the device–composed of a thin (50 nm) titanium dioxide film between two 5 nm thick electrodes, one Ti, the other Pt, as charge passes through the electrodes the oxygen drifts changing the resistance until the current changes direction.03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14Types of memristors found (cont)•Polymeric memristor–Similar to the TiO2 in operation–Uses organic materials and polymers to create the memristive effect.http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=0138082303/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Types of memristors found (cont)•Spin memristive systems–Uses the spin of an electron to more accurately model the ideal properties of a memristor.–Semiconductor/half-metal junction is used to spin the electronshttp://physics.ucsd.edu/~diventra/Memristorpubfinal.pdf03/03/09ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-16LimitationsAs this is an extremely new technology, the only limitation is what you
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