MEMRISTER

A Presentation by

R.Sandeep

CONTENTSo Introduction

o History

o Theory

o An analogy

o Construction

o Working

o Possible applications

o Conclusion

WHAT IS MEMRISTOR?Fourth fundamental circuit element

Two terminal device

Passive element

Its resistance depends

on the amount of charge passed

through it

That’s why it is

called “memristor”(memory resistor)

Memristor

Memory Resistor+

HISTORY

In 2008 a team lead

by Stanley

Williams created

the first memristor

Leon Chua proposed the existence

of memristor in 1971

Definition of MemristorA 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.

Characterized by Memristance

MEMRISTANCE

Memristance is simply charge-dependent resistance.

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

Unit - ohm (Ω)

Symbol

AN ANALOGYMemristor Pipe

Charge Water

Conductance Cross sectional area

Potential Pressure

When water flows in one directionthe diameter increases (resistance decreases)

When water flows in opposite directionthe diameter decreases (resistance increases)

CONSTRUCTION OF TIO2 MEMRISTOR

Equivalent circuit

WORKING

PT PTTiOv(2-x)

TiO2

3 nm

2 nm

OxidizedReduced

(-)ve (+)ve

Applied voltage makes the oxygen vacancies

(+ve) to shift towards the –ve voltage.

WORKINGShift between the layers is

permanent in nature.

It exist even after the voltage has

been removed.

Causes the permanent change in

resistance

BENEFITS OF MEMRISTOR TECHNOLOGY

Would allow for a quicker boot up since

information is not lost when the device is turned

off.

Hard Disk + Ram = MEMRISTOR

Uses less energy and produces less heat.

Eliminates the need to write computer programs

that replicate small parts of the brain.

BENEFITS OF MEMRISTOR TECHNOLOGY

Compatible with current CMOS

interfaces

Power Consumption

As non-volatile memory, memristors do

not consume power when idle.

Behavior

3 Memristors to make a NAND gate

27 NAND gates to make a Memristor

BENEFITS OF MEMRISTOR TECHNOLOGY

Creating a Analog Computer that works much

faster than Digital ones.

Provides greater resiliency and reliability

when power is interrupted in data centers.

Density allows for more information to be

stored.

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.

APPLICATIONS

As a switch

As a non volatile memory

Can perform logic operations

In artificial neural networks

AS A MEMORY UNIT

1 cm3 memristor = 1 terabit

FUTURE TECHNOLOGICAL SIGNIFICANCE

Being implemented to do neural computing. (post office,

banks).

Pattern recognition and learning.

Crossbar latches to replace transistors.

Smaller, lower power consumption SSDs.

New forms signal processing and control systems.

Memristors can be used to do digital logic using

implication instead of NAND.

NOT PERFECT YET !Though hundreds of thousands of

memristor semiconductors have

already been built, there is still

much more to be perfected.

Needs more defect engineering.

No design standards (rules).

Fair endurance (overlookable e.g..

Transistors

CONCLUSION

Memristor will change circuit

design in the 21st century as

radically as the transistor

changed it in the 20th.

THANK U……..