A basic presentation on Memristor. How it works,uses, advantages and disadvantages etc., .

1. MEMRISTER
A Presentation by
R.Sandeep

2. CONTENTS
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Introduction
History
Theory
An analogy
Construction
Working
Possible applications
Conclusion

3. WHAT IS MEMRISTOR?
 Fourth fundamental circuit element
 Two terminal device
Memristor
 Passive element
 Its resistance depends
on the amount of charge passed Memory
through it
 That’s why it is
called “memristor”(memory resistor)
+
Resistor

4. HISTORY
Leon Chua proposed the existence
of memristor in 1971
In 2008 a team lead
by Stanley
Williams created
the first memristor

5. 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

6. MEMRISTANCE
Memristance is simply charge-dependent
resistance.
V(t) = M(q(t))*I(t)
Unit - ohm (Ω)
Symbol

7. AN ANALOGY
Memristor
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)

8. CONSTRUCTION OF TIO2 MEMRISTOR
Equivalent circuit

9. WORKING
2 nm
(-)ve
TiOv(2-x)
PT
PT
(+)ve
TiO2
3 nm
Reduced
Oxidized
 Applied voltage makes the oxygen vacancies
(+ve) to shift towards the –ve voltage.

10. WORKING
Shift
between the layers is
permanent in nature.
It exist even after the voltage has
been removed.
Causes the permanent change in
resistance

11. 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.

12. 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


13. 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.

14. 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.

15. APPLICATIONS
As a switch
As a non volatile memory
Can perform logic operations
In artificial neural networks

16. AS A MEMORY UNIT
1 cm3 memristor = 1 terabit

17. 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.

18. 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

19. CONCLUSION
Memristor will change circuit
design in the 21st century as
radically as the transistor
th.
changed it in the 20

20. THANK U……..