Upload
yasar-qazi
View
1.179
Download
5
Embed Size (px)
Citation preview
THE MISSING ELEMENT OF THE CIRCUIT THEORY
Presented byYasar Shafat Qazi
ECE-10-53
The Idea
Memristance
Properties of Memristor
HP Memristor
Applications
Benefits & Future
Conclusion
Theory developed in 1971 by Professor Leon Chua at University of California.
Exploring symmetry between the four fundamental circuit variables.
Charge
Voltage
Current
Flux
..and Time
….a clock variable
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Capacitor (Q & V)
Resistor (V & I)
Inductor (Φ & I)
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Φ = L.i Inductor
No Relation , No device?
v=dΦ/dt i=dq/dt
Capacitor q = C.v
Resistor
v = i.R
Voltage (V)
Current(i)
Charge (q)
Flux (Φ)
Φ = L.i Inductor
Memristor
Φ=M.q
v=dΦ/dt i=dq/dt
Capacitor q = C.v
Resistor
v = i.R
A memristor is Characterized by Memristance
Memristance is simply charge-dependent resistance.
V(t) = Mq(t).I(t)
Unit - ohms (Ω)
MEMRISTOR
Memristor
Memory Resistor+A Crossbar Array Memristors
Circuit Symbol:
Changes Resistance with Applied Voltage
Nonvolatile state is encoded by impedance, not by voltage.
Found when researching ways to overcome Nano-scale manufacturing issues.
Smaller = Better!
Memristance also varies
with Frequency
Plot between Voltage & Current across a memristor
PT PTTiO(2-x)
TiO2
3 nm
2 nm
OxidizedReduced
(-)ve (+)ve
R(TiO2-x) < R(TiO2)
When w=D, R =RON =Low
& when w=0, R=ROFF=High
Applied voltage makes the (+ive) oxygen vacancies to shift towards the (–ive) voltage.
The crossbar topology is composed of a grid of horizontal and vertical traces
Forcing the Memristor to its extreme resistance values (RON and ROFF)
Concept Of Behavior under Different Frequencies is Utilized.
NanowiresNanowires
Memristors
Faster boot
Speed: (Semiconductor) < (Memristor)
Density allows for more information to be stored.
Low Power Consumption
Analog Memory.
Faster than Flash memory.
Innovating Nano Technology due to the fact that it performs better the smaller it becomes.
Creating a Analog Computer that works much faster than Digital ones.
Pattern recognition and learning.
Brain Like Systems
Still In Research Phase.
Needs more precise engineering.
No design standards.
Q, V , I , Φ may not be the only variables in circuit theory.
There can possibly be more than 4 fundamental Circuit elements.
Proposed Elements : MemCapacitor & MemInductor