MEMRISTOR

PRESENTED BY

Varun Thomas

S7 R

No 39

CONTENTIntroductionBasic memristor modelAnalogyTypes of memristorsWorking of memristorMemristor as storage deviceAdvantages/DisadvantagesApplicationConclusionReference

Courtesy : memristor.org/technical-details

A fundamental circuit A two terminal device Relates to charge and flux

INTRODUCTION

BASIC MEMRISTOR MODELDoped: region of low resistanceUndoped: region of high resistanceR off : Resistance when w/d=0R on: Resistance when w/d=1

Courtesy : acm.org/memristor.html

ANALOGY

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TYPES OF MEMRISTORSpintronic MemristorTitanium dioxide Memristor

WORKING OF MEMRISTOR

Spintronic Memristor◦Spin of electrons◦Magnetism◦Magneto resistance principal◦Electrons flow alters the magnetization state

WORKING OF MEMRISTOR

◦Two thin layer sandwich◦First layer oxygen deficient ◦Oxygen vacancies control resistance

Titanium dioxide Memristor

Titanium Dioxide Memristor

WORKING OF MEMRISTOR

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MEMRISTOR FOR STORAGENonvolatileEnergy required during switchingMemristor as switches in crossbar architecture

CROSSBAR ARCHITECTURE

• Connected mesh of perpendicular wires• Crossing wires connected by switch• Switch closed applying positive voltage• Switch opened by reversed voltage

CROSSBAR ARCHITECTURE

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MEMORY MANAGEMENT

• Read operation• Write operation• Addressing

READ OPERATION

• Voltage below threshold voltage applied• If ON conducts• If OFF doesn't conduct

Courtesy :acm.org/memristor.html

WRITE OPERATION• A voltage above threshold voltage applied• Stage inverted by opposite polarity

• Voltage for duration tw applied

Courtesy :acm.org/memristor.html

ADDRESSING• Lines arranged in columns and rows• Cell addressed by row and column

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ADVANTAGES Eliminates delay Speed inversely proportional to sizeLarge density 1terabit/cm2

Analog data storage possible

DISADVANTAGESDissipates heat No design standardsNeeds defect engineering

APPLICATIONFaster SSD’sBrain like systemSmaller hardware devicesReplace DRAM

CONCLUSIONLatest technologyHigh speed memory devicesLow power requirements

REFERENCED. B. Strukov, G. S. Snider, D. R. Stewart, and

R. S.Williams, “The missing memristor found,” Nature 453, 80–83 (2008).www.nature.org/

missing-memristor-foundL. O. Chua, “Memristor—The missing circuit

element,”IEEE Trans. Circuit Theory, vol. CT18,pp.507519,Sept.1971.www.spectrum.ieee/

semiconductors/processors/memristorhttp://www.memristor.org/memory-

resistor

THANK YOU

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