MEMRISTOR

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MEMRISTOR

• PRESENTED BY
• Varun Thomas
• S7 R
• No 39

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CONTENT

• Introduction
• Basic memristor model
• Analogy
• Types of memristors
• Working of memristor
• Memristor as storage device
• Advantages/Disadvantages
• Application
• Conclusion
• Reference

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Courtesy memristor.org/technical-details
INTRODUCTION

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

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BASIC MEMRISTOR MODEL

• Doped region of low resistance
• Undoped region of high resistance
• R off Resistance when w/d0
• R on Resistance when w/d1

Courtesy acm.org/memristor.html
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ANALOGY
Courtesy www.memristor.org/memory-resistor/educat
ion
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TYPES OF MEMRISTOR

• Spintronic Memristor
• Titanium dioxide Memristor

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WORKING OF MEMRISTOR

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

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WORKING OF MEMRISTOR

• Titanium dioxide Memristor

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

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Titanium Dioxide Memristor
WORKING OF MEMRISTOR
Courtesy www.memristor.org/memory-resistor/educat
ion
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MEMRISTOR FOR STORAGE

• Nonvolatile
• Energy required during switching
• Memristor as switches in crossbar architecture

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CROSSBAR ARCHITECTURE

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

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CROSSBAR ARCHITECTURE
Courtesy by memristor.org/memory-resistor/educatio
n
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MEMORY MANAGEMENT

• Read operation
• Write operation
• Addressing

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READ OPERATION

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

Courtesy acm.org/memristor.html
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WRITE OPERATION

• A voltage above threshold voltage applied
• Stage inverted by opposite polarity
• Voltage for duration tw applied

Courtesy acm.org/memristor.html
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ADDRESSING

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

Courtesy www.memristor.org/memory-resistor/educat
ion
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ADVANTAGES

• Eliminates delay
• Speed inversely proportional to size
• Large density 1terabit/cm2
• Analog data storage possible

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DISADVANTAGES

• Dissipates heat
• No design standards
• Needs defect engineering

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APPLICATION

• Faster SSDs
• Brain like system
• Smaller hardware devices
• Replace DRAM

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CONCLUSION

• Latest technology
• High speed memory devices
• Low power requirements

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REFERENCE

• D. B. Strukov, G. S. Snider, D. R. Stewart, and
  R. S.Williams, The missing memristor found,
  Nature 453, 8083 (2008).www.nature.org/
• missing-memristor-found
• L. O. Chua, MemristorThe missing circuit
  element,IEEE Trans. Circuit Theory, vol.
  CT18,pp.507519,Sept.1971.www.spectrum.ieee/
• semiconductors/processors/memristor
• http//www.memristor.org/memory-resistor

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THANK YOU
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QUESTIONS???