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Memristor: Modelling and Applications. Amit Kulkarni Nguyen Hoang Kasyab P Subramaniyan Per Larsson-Edefors. Content. What is memristor? … SPICE model. What is memristor?. Two terminal passive electrical component Memorize the charge flow Change the resistance Symbol: . - PowerPoint PPT Presentation
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Memristor: Modelling and Applications
Amit KulkarniNguyen Hoang
Kasyab P SubramaniyanPer Larsson-Edefors
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Content
• What is memristor?• …• SPICE model
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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What is memristor?
• Two terminal passive electrical component• Memorize the charge flow
– Change the resistance• Symbol:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Leon Chua’s prediction of existence of Memristor
Dr.Leon O. ChuaUniversity of California, Berkeley
Chalmers university of Technology DAT175 Topics in Electronic System Design
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State equations of memristor
‘w’ is state variable
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Pinched hysteresis loop
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Courtesy: Massimiliano Di Ventra, Yuriy V. Pershin, and Leon O. Chua.Publication: Circuit Elements With Memory: Memristors,Memcapacitors, andMeminductors
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Physical implementation
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Dr. R. Stanley WilliamsHP Labs(Quantum science)
Chalmers university of Technology DAT175 Topics in Electronic System Design
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SPICE model
• State equation:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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SPICE model (1)
• Port equation:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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SPICE model (2)
• Full model:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Write circuit
• Decision levels
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• Circuit
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Write circuit(1)
• Write logic – 1
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• Write logic – 0
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Write circuit(2)
• Express flux in terms of state variable
• Ideal case: – logic-1 at level 1– logic-0 at level 0
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Write circuit(3)
• Applying to ideal case:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Read circuit
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IEEE/ACM International Conference 2009
(from HP) IEEE/ISCAS International Symposium 2011
State perturbation may occur!
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Read circuit (1)
• State perturbation:– State level changes while applying voltage for
reading– Memristor is charge-dependent
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How to avoid/reduce?
Complementary-charge circuit
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Read circuit (2)
• Influence of complementary charge on state stability
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Read circuit (3)
• Influence of complementary charge on state stability
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10,000 times
500,000 times
Chalmers university of Technology DAT175 Topics in Electronic System Design
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Read circuit (4)
• Outputs of logic 0 and 1:
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Challenges of the research
• Control state stability– For write and read circuits– For other applications
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Applications
• Non-volatile memory– Up to 100Gbits/cm²
• Crossbar switch• LUT
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Summary
• Memristor can remember amount of charge goes through it via its varied resistance
• SPICE model is made for circuit-level research• Read-write circuits are built• Challenge in applications: state stability• Vast of applications
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Chalmers university of Technology DAT175 Topics in Electronic System Design
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Thank you for your attention!
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