memristor by sandeep
TRANSCRIPT
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……..