MEMRISTOR

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Presented By:Amit kumarReg. No- 100101ECR019

MEMRISTOR

Memristor

Memory Resistor+

• Memristor can be defined as a two terminal device which shows the relation between magnetic flux and charge.

• Fourth fundamental circuit element.

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

V(t) = M(q(t))*I(t)

M(q(t)) =V ( t )I ( t )

• Memristance is simply charge-dependent resistance

• Unit - ohm (Ω)

The Missing Circuit Element

Voltage (V)

Current(i)

Charge (q)

Flux (Φ)

Φ = Li Inductors

??

v=dΦ/dt i=dq/dt

Resistors v=Ri

q=CvCapacitors

Memristor

MemristorsΦ=Mq

Voltage (V)

Current(i)

Charge (q)

Flux (Φ)

Φ = Li Inductors

v=dΦ/dt i=dq/dt

Resistors v=Ri

q=CvCapacitors

Construction of TiO2 memristor

TiO2-x TiO2Pt

Equivalent circuit

Working

Tio2-x

Tio2

Ron

Roff

Memristor as a memory unit

1 cm3 memristor = 1 terabit

Analogy Of Memristor

A RESISTOR WITH MEMORY BEHAVES LIKE A PIPE

• 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.

What Sets Memristor Apart ??

• Conventional devices use only 0 and 1 but Memristor can use any value 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.

• 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.

Property Of Memristor

Benefits Of Memristor Technology

• Would allow for a quicker boot up since information is not lost when the device is turned off.

• Creating a Computer that never has to boot up.• Density allows for more information to be stored.• Has the capacity to remember the charge that flows

through it at a given point of time.• No more hard drive and RAM, just Memristor.• Very high storage and speed.

Future Technological Significance

• Pattern recognition.

• 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

Major Challenges

• No design standards (rules)

• Needs more defect engineering

• Dissipates heat when written to or read

Conclusion

It is sure that Memristor is going to revolute 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

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THANK YOU !!