memristor : the future of the electronics

7/30/2019 Memristor : The future of the Electronics

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Fourth Fundamental Circuit

Element: Memristor

Ashish Kumar

Roll No. PhD12110202

Discipline of Electrical Engineering


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Outline

Fundament circuit elementFourth element : memristor

Memristor

Memristor modelImplementation technique

Fabrication process

Logic based on memristorCapabilities of memristor

Conclusion


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Fundamental Circuit Element

Chua, L. O. Memristor-the missing circuit element IEEE Trans. Circuit Theory CT Vol.18 Issue 5, pp.507519 1971.

V i

q

Voltage, VCurrent, A

Resistor:

Capacitor:Inductor:

Memristor:

Charge Flux?

d

dqM


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Fourth element: Memristor

Existence of memristor predict by

Prof. Leon Chua based on primarily

symmetry .

Two terminal passive Device. Memristor = Memory + Resistor

Memristor is non linear resistor &

non-volatile memory

Where w is state variable. Symbol of MemristorChua, L. O. Memristor-the missing circuit element IEEE Trans. Circuit Theory CT Vol.18 Issue 5, pp.507519 1971.

iiwRv ),(


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Memristor Model

Consider a thinsemiconductor film ofthickness D sandwiched

between two metalcontacts.

Doped region has lowresistance (Ron) and

reminder has high resistanceROFF

1. Dmitri B. Strukov, Gregory S. Snider, Duncan R. Stewart & R. Stanley Williams The missing MemristorfoundNature Letter

Vol. 453 pp. 80-83 May2008.


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1. Dmitri B. Strukov, Gregory S. Snider, Duncan R. Stewart & R. Stanley Williams The missing MemristorfoundNature Letter

Vol. 453 pp. 80-83 May2008.

2. Yenpo Ho, Garng M. Huang, Peng LiNonvolatile Memristor Memory: Device Characteristics and Design Implications

IEEE/ACM International Conference on Computer-Aided Design Digest of Technical Papers pp. 485 2009.

Memristor Model (Cont.)

dtdqMdtddqd

/

)/)(1(2

DtqRRM ONvOFFq

Flux Controlled Memductance [2]2/12

0]/)()/1[( Doff tDWRM

Where M is function of charge or flux.

Current Controlled Memristance [1]


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Implementation Techniques For

Memristor

Titanium dioxide memristors

Polymeric (ionic) memristors

Manganite memristors

Resonant - tunnelling memristors

Spintronic memristors

ZnO-based memristor


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Fabrication Process Flow

Starting with the Silicon

wafer as base substrate. Deposition of bottom

electrode.

TiO2 deposition +Annealing in presence ofO2.

Top electrode depositionsimilar to bottomelectrode.


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Memristors I-V Curve

Memristive switching curves. Arrows indicate the

sweeping direction of applied voltage

Dmitri B. Strukov, Gregory S. Snider, Duncan R. Stewart & R. Stanley Williams The missing Memristor found

Nature Letter Vol. 453 pp. 80-83 May2008.

Drift Motion of Oxygen vacancies, which are

positively charged carriers


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Fabrication Technique for Memristor

T. Prodromakis, K. Michelakis and C. Toumazou Practicalmicro/nano fabrication implementations of memristive devices

12th International Workshop on Cellular Nanoscale Networks and their Applications (CNNA) pp. 1-4, Feb. 2010 .


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Memristor Crossbar Latches

http://www.hpl.hp.com/news/2008/apr-jun/engineering_memristor.html

50 nm

half-pitch

Pt

Tio2 Pt

Reversible and non-

volatile switching of

nanoscale TiO2 -x devices.

An AFM image of 1 17

nano-cross point devices

with 50 nm half-pitch Pt

nano wires fabricated by

nano imprint lithography.

Sandwich a 50-nm-thick

TiO2 insulating thin film

between Pt wires.

50
http://www.hpl.hp.com/news/2008/apr-jun/engineering_memristor.htmlhttp://www.hpl.hp.com/news/2008/apr-jun/engineering_memristor.htmlhttp://www.hpl.hp.com/news/2008/apr-jun/engineering_memristor.htmlhttp://www.hpl.hp.com/news/2008/apr-jun/engineering_memristor.html


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Logic Based On Memristor

Imply Logic implemented by materialimplication Boolean logic operation on two

variables p and q such that p q using

memristors. For understanding:

All crow are black.

Take P- crow and Q-black

P Q P Q

T T T

T F FF T T

F F TJulien Borghetti, Gregory S. Snider, Philip J. Kuekes, J. Joshua Yang, Duncan R. Stewart & R. Stanley Williams

Memristive switches enable stateful logic operations via material implication Nature Letter Vol. 464 no. 8 pp.873-876 2010.


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Logic Based On Memristor (Cont.)

Consider memristor operate in one quadrant

Ron< RG< Roff VCOND


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Capabilities of the Memristor

Memristor based memory capable to have high

density approx. 154-309 Gbit/cm2 and more.

Complex self learning neural networks and hybridtransistor/memristor circuit.

Memristor logic circuits on par with CPUs and other

transistor circuits. Advanced artificial thinking brains.


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Conclusion

Able to extend Moores law. Memristor- potential candidate for non-linear

electronics.


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Acknowledgement

Prof. Maryam S. Baghini, Centre of Excellence

in Nanoelectronics, IIT-Bombay.


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memristor : the future of the electronics

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