memristor by sandeep
DESCRIPTION
A basic presentation on Memristor. How it works,uses, advantages and disadvantages etc., .TRANSCRIPT
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MEMRISTER
A Presentation by
R.Sandeep
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CONTENTSo Introduction
o History
o Theory
o An analogy
o Construction
o Working
o Possible applications
o Conclusion
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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+
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HISTORY
In 2008 a team lead
by Stanley
Williams created
the first memristor
Leon Chua proposed the existence
of memristor in 1971
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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
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MEMRISTANCE
Memristance is simply charge-dependent resistance.
V(t) = M(q(t))*I(t)
Unit - ohm (Ω)
Symbol
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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)
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CONSTRUCTION OF TIO2 MEMRISTOR
Equivalent circuit
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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.
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WORKINGShift between the layers is
permanent in nature.
It exist even after the voltage has
been removed.
Causes the permanent change in
resistance
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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.
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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
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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.
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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.
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APPLICATIONS
As a switch
As a non volatile memory
Can perform logic operations
In artificial neural networks
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AS A MEMORY UNIT
1 cm3 memristor = 1 terabit
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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.
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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
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CONCLUSION
Memristor will change circuit
design in the 21st century as
radically as the transistor
changed it in the 20th.
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THANK U……..