MEMRISTER

A Presentation byR.Sandeep

CONTENTS

o Introductiono Historyo Theoryo An analogyo Constructiono Workingo Possible

applicationso Conclusion

WHAT IS MEMRISTOR?

Fourth fundamental circuit elementTwo terminal devicePassive element Its resistance depends on the amount of charge passed through itThat’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 Memristor

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.

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 direction the diameter increases (resistance decreases)

When water flows in opposite direction the diameter decreases (resistance increases)

CONSTRUCTION OF TIO2 MEMRISTOR

Equivalent circuit

WORKINGPT 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 = MEMRISTORUses 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 ConsumptionAs non-volatile memory, memristors do

not consume power when idle.Behavior

3 Memristors to make a NAND gate27 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 betweenInnovating nanotechnology due to the fact

that it performs better the smaller it becomes.

APPLICATIONSAs a switchAs a non volatile memoryCan 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

CONCLUSIONMemristor will change circuit design in the 21st century as radically as the transistor changed it in the 20th.

THANK U……..