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MEMRISTOR
The Next Revolution In Technology

UNDER GUIDANCE OF
PROF.MR.DODABHANGI S.B.
PRESENTED BY
DESAI MAHADEV V.
(ROLLNO.37)
OVERVIEW












WHAT IS MEMRISTOR
HISTORY OF MEMRISTOR
EXISTING TECHNOLOGY
WORKING OF MEMRISTOR
PROPERTY OF MEMRISTOR
BENEFITS OF MEMRISTOR
FUTURE
ADVANTAGE OF MEMERISTOR
MAJOR CHALLENGES
CONCLUSION
REFERENCES
What is
What is
memristor ?
memristor ?
MEMRISTOR
Memristor
Memory

+

Resistor

Memristor
Definition of Memristor
Memristor can be defined as a two
terminal device which shows the
relation between magnetic flux
and charge
MEMRISTOR SYMBOL
• A Memristor is a semiconductor whose resistance
varies as a function of flux and charge. This allows it
to “remember” what has passed through the circuit.
• Characterized by Memristance
• Memristance is simply charge-dependent resistance.
V(t) = M(q(t))*I(t)
• Unit - ohm (Ω)
• Symbol
"Memristor" by mahadev desai
The term Memristor was first proposed by
Leon Chua in 1971when he was a rising
professor at
The University of California
Berkeley

LEON.O.CHUA
"Memristor" by mahadev desai
Three Fundamental Circuit Elements

Resistor
Georg Ohm 1827

Resistor

Capacitor

v = R×
i

q = C ×v
Capacitor
von Kleist 1745

Inductor

ϕ = L ×i
Inductor
Michael Faraday 1831
The Missing Circuit Element
Voltage
(V)

Resistors
v=Ri
v=dΦ/dt

Capacitors q=Cv

Charge
(q)

Current
(i)

i=dq/dt
Φ = Li

?
?

Inductors

Flux (Φ)
Memristor 1971

Voltage
(V)

Resistors
v=Ri
v=dΦ/dt

i=dq/dt

Capacitors q=Cv

Charge
(q)

Current
(i)

Φ = Li

Φ=Mq

Memristors

Inductors

Flux (Φ)
WORKING
2 nm

(-)ve

TiOv(2-x)

PT

PT

(+)ve

TiO2
3 nm
Reduced

Oxidized

Applied voltage makes the oxygen vacancies
(+ve) to shift towards the –ve voltage
The HP device is composed of a thin (50 nm) titanium
dioxide film between two 5 nm thick electrodes, one Ti, the
other Pt. Initially, there are two layers to the titanium
dioxide film, one of which has a slight depletion of oxygen
atoms.
 The oxygen vacancies act as charge carriers, meaning that
the depleted layer has a much lower resistance than the nondepleted layer.
 When an electric field is applied, the oxygen vacancies
drift ,changing the boundary between the high-resistance and
low-resistance layers.
Thus the resistance of the film as a whole is dependent on
how much charge has been passed through it in a particular
direction, which is reversible by changing the direction of
current.
Since the HP device displays fast ion conduction at
nanoscale, it is considered as a nanoionic device.
Analogy Of Memristor
•

The diameter of
pipe remains same
when the current is
switched off, until
it is switched on
again.

•

The pipe, when the
current is
switched on again,
remembers what
current has flowed
through it.

A RESISTOR WITH
MEMORY BEHAVES LIKE A
PIPE
What Sets Memristor Apart ??
• Conventional devices use only 0 and 1; Memristor can
use anything between 0 and 1.
• Faster than Flash memory.
– Allow digital cameras to take pictures with no delay in
between.
• Innovating nanotechnology due to the fact that it
performs better the smaller it becomes.
Property Of Memristor
• Retain its resistance level even after power had
been shut down.
• Remember (or recall) the last resistance it had,
before being shut off.
• By changing the speed and strength of the
current, it is possible to change the behavior of
the device.
• A fast and hard current causes it to act as a
digital device.
• A soft and slow current causes it to act as an
analog device.
Is it analog or digital?
Amazingly, its both.
Benefits Of Memristor Technology
• Would allow for a quicker boot up since information is
not lost when the device is turned off.
• Uses less energy and produces less heat.
• Eliminates the need to write computer programs that
replicate small parts of the brain.
• Creating a Computer that never has to boot up.
• Does not lose information when turned off.
• Density allows for more information to be stored.
• Has the capacity to remember the charge that flows
through it at a given point in time.
Future Technological Significance
• Pattern recognition and learning.
• Crossbar latches to replace transistors.
• New forms signal processing and control systems.
• Memristors can be used to do digital logic using
implication instead of NAND.

• Could lead to replacement of the transistor
• No more hard drive and RAM
• Just Memristors
• Very high storage and speeds.
Nonvolatile memories

Booting free computers
ADVANTAGES
•

Provides greater resiliency and reliability when power
is interrupted in data centers.

•

Density allows for more information to be stored.

•

Power Consumption
As non-volatile memory, memristor do not
consume power when idle.
MAJOR CHALLNGES
• The memristor major challenges are its relatively low
speeds
• No design standards (rules)
• Needs more defect engineering
• Dissipates heat when written to or read
Conclusion
It is sure that Memristor is going to revolutionaries the 21st
century as radically as the transistor in the 20th century But
Memristor will have to wait a few years for a killer app
like transistor which had to wait almost a decade after it’s
invention for the killer app in the form of hearing aids

Finally as Leon O Chua mentioned

It’s time to rewrite all the EE textbooks ”
References
 How We Found the Missing Memristor by Stanley Williams, IEEE
Spectrum December 2008.
 L.O, Chua, Memristor-missing circuit clement, IEEE Tans . Circuit
Theory, Vol. 18, 1971, pp. 507-519.
 Memristor and Memristive Systems Symposium, University of California,
Berkeley, November 21,2008.
 Stateful Implication Logic with Memristors by Eero Lehtonen, Mika Laiho
2009 IEEE/ACM International Symposium on Nanoscale Architectures

28
"Memristor" by mahadev desai

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"Memristor" by mahadev desai

  • 1. MEMRISTOR The Next Revolution In Technology UNDER GUIDANCE OF PROF.MR.DODABHANGI S.B. PRESENTED BY DESAI MAHADEV V. (ROLLNO.37)
  • 2. OVERVIEW            WHAT IS MEMRISTOR HISTORY OF MEMRISTOR EXISTING TECHNOLOGY WORKING OF MEMRISTOR PROPERTY OF MEMRISTOR BENEFITS OF MEMRISTOR FUTURE ADVANTAGE OF MEMERISTOR MAJOR CHALLENGES CONCLUSION REFERENCES
  • 5. Definition of Memristor Memristor can be defined as a two terminal device which shows the relation between magnetic flux and charge MEMRISTOR SYMBOL
  • 6. • A Memristor is a semiconductor whose resistance varies as a function of flux and charge. This allows it to “remember” what has passed through the circuit. • Characterized by Memristance
  • 7. • Memristance is simply charge-dependent resistance. V(t) = M(q(t))*I(t) • Unit - ohm (Ω) • Symbol
  • 9. The term Memristor was first proposed by Leon Chua in 1971when he was a rising professor at The University of California Berkeley LEON.O.CHUA
  • 11. Three Fundamental Circuit Elements Resistor Georg Ohm 1827 Resistor Capacitor v = R× i q = C ×v Capacitor von Kleist 1745 Inductor ϕ = L ×i Inductor Michael Faraday 1831
  • 12. The Missing Circuit Element Voltage (V) Resistors v=Ri v=dΦ/dt Capacitors q=Cv Charge (q) Current (i) i=dq/dt Φ = Li ? ? Inductors Flux (Φ)
  • 14. WORKING 2 nm (-)ve TiOv(2-x) PT PT (+)ve TiO2 3 nm Reduced Oxidized Applied voltage makes the oxygen vacancies (+ve) to shift towards the –ve voltage
  • 15. The HP device is composed of a thin (50 nm) titanium dioxide film between two 5 nm thick electrodes, one Ti, the other Pt. Initially, there are two layers to the titanium dioxide film, one of which has a slight depletion of oxygen atoms.  The oxygen vacancies act as charge carriers, meaning that the depleted layer has a much lower resistance than the nondepleted layer.  When an electric field is applied, the oxygen vacancies drift ,changing the boundary between the high-resistance and low-resistance layers.
  • 16. Thus the resistance of the film as a whole is dependent on how much charge has been passed through it in a particular direction, which is reversible by changing the direction of current. Since the HP device displays fast ion conduction at nanoscale, it is considered as a nanoionic device.
  • 17. Analogy Of Memristor • The diameter of pipe remains same when the current is switched off, until it is switched on again. • The pipe, when the current is switched on again, remembers what current has flowed through it. A RESISTOR WITH MEMORY BEHAVES LIKE A PIPE
  • 18. What Sets Memristor Apart ?? • Conventional devices use only 0 and 1; Memristor can use anything between 0 and 1. • Faster than Flash memory. – Allow digital cameras to take pictures with no delay in between. • Innovating nanotechnology due to the fact that it performs better the smaller it becomes.
  • 19. Property Of Memristor • Retain its resistance level even after power had been shut down. • Remember (or recall) the last resistance it had, before being shut off. • By changing the speed and strength of the current, it is possible to change the behavior of the device. • A fast and hard current causes it to act as a digital device. • A soft and slow current causes it to act as an analog device.
  • 20. Is it analog or digital? Amazingly, its both.
  • 21. Benefits Of Memristor Technology • Would allow for a quicker boot up since information is not lost when the device is turned off. • Uses less energy and produces less heat. • Eliminates the need to write computer programs that replicate small parts of the brain. • Creating a Computer that never has to boot up. • Does not lose information when turned off. • Density allows for more information to be stored. • Has the capacity to remember the charge that flows through it at a given point in time.
  • 22. Future Technological Significance • Pattern recognition and learning. • Crossbar latches to replace transistors. • New forms signal processing and control systems. • Memristors can be used to do digital logic using implication instead of NAND. • Could lead to replacement of the transistor
  • 23. • No more hard drive and RAM • Just Memristors • Very high storage and speeds.
  • 25. ADVANTAGES • Provides greater resiliency and reliability when power is interrupted in data centers. • Density allows for more information to be stored. • Power Consumption As non-volatile memory, memristor do not consume power when idle.
  • 26. MAJOR CHALLNGES • The memristor major challenges are its relatively low speeds • No design standards (rules) • Needs more defect engineering • Dissipates heat when written to or read
  • 27. Conclusion It is sure that Memristor is going to revolutionaries the 21st century as radically as the transistor in the 20th century But Memristor will have to wait a few years for a killer app like transistor which had to wait almost a decade after it’s invention for the killer app in the form of hearing aids Finally as Leon O Chua mentioned It’s time to rewrite all the EE textbooks ”
  • 28. References  How We Found the Missing Memristor by Stanley Williams, IEEE Spectrum December 2008.  L.O, Chua, Memristor-missing circuit clement, IEEE Tans . Circuit Theory, Vol. 18, 1971, pp. 507-519.  Memristor and Memristive Systems Symposium, University of California, Berkeley, November 21,2008.  Stateful Implication Logic with Memristors by Eero Lehtonen, Mika Laiho 2009 IEEE/ACM International Symposium on Nanoscale Architectures 28

Editor's Notes

  1. Conventional devices use only 0 and 1; Memristor can use anything between 0 and 1 (0.3, 0.8, 0.5, etc.) When a slow current is applied, the Memristor acts as an analog device. Conversely, when a fast current is applied, the Memristor acts as a digital device.
  2. Thousands of memristors on top of the CPU acting as both the RAM and the Hard disk drive.