Welcome Seminar on   MEMRISTOR 19 Sept. 2009
MEMRISTOR Memristor Memory  Resistor + Memristor
Defination of Memristor <ul><li>A memristor is a semiconductor whose resistance varies as a function of flux and current. ...
Memristance   <ul><li>Memristance is simply charge-dependent resistance. </li></ul><ul><li>  V(t) = M(q(t))*I(t) </li></ul...
Emergence Of Memristic Theory <ul><li>Theory was developed in 1971 by Professor  Leon Chua at University of California, Be...
Fundamental Circuit Variables <ul><li>Voltage, V (V)  – work done required to bring charge from ∞ to a Electric field. </l...
Fundamental Relationships <ul><li>Current is the derivative of Charge </li></ul><ul><li>Q=  ∫ I dt </li></ul><ul><li>Volta...
Symmetry Of Relationships Voltage (V) Current(i) Charge (q) Flux (Φ)
3  Fundamental Passive Linear Elements <ul><li>Capacitor,C (F) </li></ul><ul><li>Resistor,R (Ω) </li></ul><ul><li>Inductor...
CAPACITORS q = C v
Symmetry Of Relationships q=Cv Capacitors q=Cv Capacitors Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
RESISTORS Ohm’s Law v = R i
Symmetry Of Relationships Resistors v=Ri Capacitors q=Cv Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
INDUCTORS Φ = L i
Symmetry Of Relationships Φ = Li Inductors ? ? v=dΦ/dt i=dq/dt Resistors v=Ri q=Cv Capacitors Voltage (V) Current(i) Charg...
Symmetry Of Relationships Memristors Φ=Mq Φ = Li Inductors v=dΦ/dt i=dq/dt Resistors v=Ri q=Cv Capacitors Voltage (V) Curr...
Relationship With Other Variables <ul><li>Φ = M q </li></ul><ul><li>dΦ/dt = M(q) dq/dt </li></ul><ul><li>V(t) = M(q) I </l...
Property Of Memristor <ul><li>Retain its resistance level even after power had been shut down </li></ul><ul><li>Remember (...
Memristic State  <ul><li>Found when researching ways to overcome nano-scale manufacturing issues. </li></ul><ul><li>Memris...
WORKING <ul><ul><li>Applied voltage makes the oxygen vacancies (+ve) to shift towards the –ve voltage.   </li></ul></ul>PT...
WORKING <ul><li>Shift between the layers in permanent in nature. </li></ul><ul><li>It exist even after the voltage has bee...
Analogy Of Memristor A RESISTOR WITH MEMORY BEHAVES LIKE A PIPE   <ul><li>The diameter of pipe remains same when the curre...
Why So Late ??? <ul><li>As its effect depends on atomic-scale movements, it only poped up on the nanoscale of William’s de...
Benefits Of Memristor Technology <ul><li>Would allow for a quicker boot up since information is not lost when the device i...
Benefits Of Memristor Technology <ul><li>Uses less energy and produces less heat. </li></ul><ul><li>Eliminates the need to...
Benefits Of Memristor Technology <ul><li>Compatible with current CMOS interfaces </li></ul><ul><li>Power Consumption </li>...
Benefits Of Memristor Technology <ul><li>Creating a Analog Computer that works much faster than Digital ones. </li></ul><u...
What Sets Memristor Apart ?? <ul><li>Conventional devices use only 0 and 1; Memristor can use  anything  between 0 and 1. ...
Future Technological Significance <ul><li>Being implemented to do neural computing. (post office, banks). </li></ul><ul><l...
Future Technological Significance <ul><li>Smaller, lower power consumption SSDs. </li></ul><ul><li>New forms signal proces...
Not Perfect Yet ! <ul><li>Though hundreds of thousands of memristor semiconductors have already been built, there is still...
Questions ???
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Memristor

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Memristor

  1. 1. Welcome Seminar on MEMRISTOR 19 Sept. 2009
  2. 2. MEMRISTOR Memristor Memory Resistor + Memristor
  3. 3. Defination of Memristor <ul><li>A memristor is a semiconductor whose resistance varies as a function of flux and current. This allows it to “remember” what has passed through the circuit. </li></ul><ul><li>Characterized by Memristance </li></ul>
  4. 4. Memristance <ul><li>Memristance is simply charge-dependent resistance. </li></ul><ul><li> V(t) = M(q(t))*I(t) </li></ul><ul><li>Unit - ohm ( Ω ) </li></ul><ul><li>Symbol </li></ul>
  5. 5. Emergence Of Memristic Theory <ul><li>Theory was developed in 1971 by Professor Leon Chua at University of California, Berkeley. </li></ul><ul><li>Found while exploring symmetry between the three fundamental passive linear circuit elements </li></ul><ul><li>In 2006, R.Stanley Williams developed practical model. </li></ul>
  6. 6. Fundamental Circuit Variables <ul><li>Voltage, V (V) – work done required to bring charge from ∞ to a Electric field. </li></ul><ul><li>Current, I (A) – flow of electric charge </li></ul><ul><li>Flux, Φ(W) – rate of flow through an area </li></ul><ul><li>Charge, Q (C) – energy per electron </li></ul>
  7. 7. Fundamental Relationships <ul><li>Current is the derivative of Charge </li></ul><ul><li>Q= ∫ I dt </li></ul><ul><li>Voltage is the derivative of Flux </li></ul><ul><li> V= ∫ d Φ /dt </li></ul>
  8. 8. Symmetry Of Relationships Voltage (V) Current(i) Charge (q) Flux (Φ)
  9. 9. 3 Fundamental Passive Linear Elements <ul><li>Capacitor,C (F) </li></ul><ul><li>Resistor,R (Ω) </li></ul><ul><li>Inductor,L (H) </li></ul>
  10. 10. CAPACITORS q = C v
  11. 11. Symmetry Of Relationships q=Cv Capacitors q=Cv Capacitors Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
  12. 12. RESISTORS Ohm’s Law v = R i
  13. 13. Symmetry Of Relationships Resistors v=Ri Capacitors q=Cv Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
  14. 14. INDUCTORS Φ = L i
  15. 15. Symmetry Of Relationships Φ = Li Inductors ? ? v=dΦ/dt i=dq/dt Resistors v=Ri q=Cv Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
  16. 16. Symmetry Of Relationships Memristors Φ=Mq Φ = Li Inductors v=dΦ/dt i=dq/dt Resistors v=Ri q=Cv Capacitors Voltage (V) Current(i) Charge (q) Flux (Φ)
  17. 17. Relationship With Other Variables <ul><li>Φ = M q </li></ul><ul><li>dΦ/dt = M(q) dq/dt </li></ul><ul><li>V(t) = M(q) I </li></ul><ul><li>P = I² M(q) </li></ul>
  18. 18. Property Of Memristor <ul><li>Retain its resistance level even after power had been shut down </li></ul><ul><li>Remember (or recall) the last resistance it had, before being shut off. </li></ul>
  19. 19. Memristic State <ul><li>Found when researching ways to overcome nano-scale manufacturing issues. </li></ul><ul><li>Memristivity has an inverse square relationship with thickness of the material, so smaller = better! </li></ul><ul><li>Nonvolatile state can be accomplished by memristors because their state is encoded by impedance (physically), not by voltage. </li></ul>
  20. 20. WORKING <ul><ul><li>Applied voltage makes the oxygen vacancies (+ve) to shift towards the –ve voltage. </li></ul></ul>PT PT TiOv(2-x) TiO2 3 nm 2 nm Oxidized Reduced (-)ve (+)ve
  21. 21. WORKING <ul><li>Shift between the layers in permanent in nature. </li></ul><ul><li>It exist even after the voltage has been removed. </li></ul><ul><li>Causes the permanent change in resistance </li></ul>
  22. 22. Analogy Of Memristor A RESISTOR WITH MEMORY BEHAVES LIKE A PIPE <ul><li>The diameter of pipe remains same when the current is switched off, until it is switched on again. </li></ul><ul><li>The pipe, when the current is switched on again, remembers what current has flowed through it. </li></ul>
  23. 23. Why So Late ??? <ul><li>As its effect depends on atomic-scale movements, it only poped up on the nanoscale of William’s devices . </li></ul>
  24. 24. Benefits Of Memristor Technology <ul><li>Would allow for a quicker boot up since information is not lost when the device is turned off. </li></ul><ul><li>Hard Disk + Ram = MEMRISTOR </li></ul>
  25. 25. Benefits Of Memristor Technology <ul><li>Uses less energy and produces less heat. </li></ul><ul><li>Eliminates the need to write computer programs that replicate small parts of the brain. </li></ul>
  26. 26. Benefits Of Memristor Technology <ul><li>Compatible with current CMOS interfaces </li></ul><ul><li>Power Consumption </li></ul><ul><ul><li>As non-volatile memory, memristors do not consume power when idle. </li></ul></ul><ul><li>Behaviour </li></ul><ul><ul><li>3 Memristors to make a NAND gate </li></ul></ul><ul><ul><li>27 NAND gates to make a Memristor </li></ul></ul>
  27. 27. Benefits Of Memristor Technology <ul><li>Creating a Analog Computer that works much faster than Digital ones. </li></ul><ul><li>Provides greater resiliency and reliability when power is interrupted in data centers. </li></ul><ul><li>Density allows for more information to be stored. </li></ul>
  28. 28. What Sets Memristor Apart ?? <ul><li>Conventional devices use only 0 and 1; Memristor can use anything between 0 and 1. </li></ul><ul><li>Faster than Flash memory. </li></ul><ul><ul><li>Allow digital cameras to take pictures with no delay inbetween </li></ul></ul><ul><li>Innovating nanotechnology due to the fact that it performs better the smaller it becomes. </li></ul>
  29. 29. Future Technological Significance <ul><li>Being implemented to do neural computing. (post office, banks). </li></ul><ul><li>Pattern recognition and learning. </li></ul><ul><li>Crossbar latches to replace transistors. </li></ul>
  30. 30. Future Technological Significance <ul><li>Smaller, lower power consumption SSDs. </li></ul><ul><li>New forms signal processing and control systems. </li></ul><ul><li>Memristors can be used to do digital logic using implication instead of NAND. </li></ul>
  31. 31. Not Perfect Yet ! <ul><li>Though hundreds of thousands of memristor semiconductors have already been built, there is still much more to be perfected. </li></ul><ul><li>Needs more defect engineering. </li></ul><ul><li>No design standards (rules). </li></ul><ul><li>Fair endurance (overlookable e.g.. Transistors </li></ul>
  32. 32. Questions ???

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