1. MEMRISTOR
PRESENTED BY
Varun Thomas
S7 R
No 39

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

3. Courtesy : memristor.org/technical-details
INTRODUCTION
A fundamental circuit
A two terminal device
Relates to charge and flux
Courtesy : memristor.org/technical-details

4. BASIC MEMRISTOR MODEL Doped: region of low resistance
Undoped: region of high resistance
R off : Resistance when w/d=0
R on: Resistance when w/d=1
Courtesy : acm.org/memristor.html

5. ANALOGY
Courtesy :

6. TYPES OF MEMRISTOR
Spintronic Memristor
Titanium dioxide Memristor

7. WORKING OF MEMRISTOR Spintronic Memristor Spin of electrons Magnetism
Magneto resistance principal
Electrons flow alters the magnetization state

8. WORKING OF MEMRISTOR Titanium dioxide Memristor
Two thin layer sandwich
First layer oxygen deficient
Oxygen vacancies control resistance

9. Titanium Dioxide Memristor
WORKING OF MEMRISTOR
Titanium Dioxide Memristor
Courtesy :

10. MEMRISTOR FOR STORAGE Nonvolatile Energy required during switching
Memristor as switches in crossbar architecture

11. CROSSBAR ARCHITECTURE
Connected mesh of perpendicular wires
Crossing wires connected by switch
Switch closed applying positive voltage
Switch opened by reversed voltage

12. CROSSBAR ARCHITECTURE
Courtesy by memristor.org/memory-resistor/education

13. MEMORY MANAGEMENT
Read operation
Write operation
Addressing

14. READ OPERATION Voltage below threshold voltage applied If ON conducts
If OFF doesn't conduct
Courtesy :acm.org/memristor.html

15. WRITE OPERATION A voltage above threshold voltage applied
Stage inverted by opposite polarity
Voltage for duration tw applied
Courtesy :acm.org/memristor.html

16. ADDRESSING Lines arranged in columns and rows
Cell addressed by row and column
Courtesy :

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

18. DISADVANTAGES Dissipates heat No design standards
Needs defect engineering

19. APPLICATION Faster SSD’s Brain like system Smaller hardware devices
Replace DRAM

20. CONCLUSION Latest technology High speed memory devices
Low power requirements

21. REFERENCE
D. B. Strukov, G. S. Snider, D. R. Stewart, and R. S.Williams, “The missing memristor found,” Nature 453, 80–83 (2008).
missing-memristor-found
L. O. Chua, “Memristor—The missing circuit element,”IEEE Trans. Circuit Theory, vol. CT18,pp ,Sept
semiconductors/processors/memristor

22. THANK YOU

23. QUESTIONS???