Welcome
Seminar on
MEMRISTOR
MEMRISTOR
Memristor
Memory Resistor+
Memristor
Defination of Memristor A memristor is formally defined as a two-
terminal elementin which the magnetic flux between the terminals is a amount of electric charge that has passed through the device.
Characterized by Memristance
Memristance Memristance is simply charge-dependent,
is a property to retain its resistance level even after power had been shut down.
V(t) = M(q(t))*I(t)
Unit - ohm (Ω)
Symbol
Emergence Of Memristic TheoryTheory was developed in 1971 by
Professor Leon Chua at University of California, Berkeley.
Found while exploring symmetry between the three fundamental passive linear circuit elements
In 2006, R.Stanley Williams developed practical model.
Fundamental Circuit Variables
Voltage, V (V) – work done required to bring charge from ∞ to a Electric field.
Current, I (A) – flow of electric chargeFlux, Φ(W) – rate of flow through an
areaCharge, Q (C) – energy per electron
Fundamental Relationships
Current is the derivative of Charge
Q= ∫I dt
Voltage is the derivative of Flux
V= ∫ dΦ/dt
Symmetry Of Relationships
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
3 Fundamental Passive Linear Elements
Capacitor,C (F)
Resistor,R (Ω)
Inductor,L (H)
CAPACITORS
q = C v
Symmetry Of Relationships
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
q=CvCapacitors q=CvCapacitorsCapacitors
RESISTORS
Ohm’s Lawv = R i
Symmetry Of Relationships
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Resistors v=Ri
Capacitors q=CvCapacitors
INDUCTORS
Φ = L i
Symmetry Of Relationships
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Φ = Li Inductors
??
v=dΦ/dt i=dq/dt
Resistors v=Ri
q=CvCapacitors
Symmetry Of Relationships
MemristorsΦ=Mq
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Φ = Li Inductors
v=dΦ/dt i=dq/dt
Resistors v=Ri
q=CvCapacitors
Relationship With Other VariablesΦ = M q
dΦ/dt = M(q) dq/dt
V(t) = M(q) I
P = I² M(q)
Property Of Memristor Retain its resistance level even after
power had been shut down
Remember (or recall) the last resistance it had, before being shut off.
Memristic State Memristivity has an inverse square relationship
with thickness of the material, so smaller = better!
Nonvolatile state can be accomplished by memristors because their state is encoded by impedance (physically), not by voltage.
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 in
permanent in nature.It exist even after the voltage has
been removed.Causes the permanent change in
resistance
V-I characteristics
Benefits Of Memristor TechnologyWould allow for a quicker boot up since
information is not lost when the device is turned off.
Creating a Analog Computer that works much faster than Digital ones.
Uses less energy and produces less heat.
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 inbetween Innovating nanotechnology due to the fact
that it performs better the smaller it becomes.
THANK
YOU