Research On Application Of Memristor Based Logic Circuit

As the fourth basic circuit component,the memristor has the advantages of low power consumption,small size,non-volatility,etc.It can reduce the power consumption of the traditional circuit while saving the circuit area and improving the overall performance of the circuit,and is expected to re-glow the Moore's Law.As a new type of memory component,the new system based on memristors has attracted wide attention.The memristor is a deivce with a large varying resistance range.The memristance will switch when applying different voltage and is able to retain a resistance value until the next voltage pulse is applied.Applications based on memristors have unlimited potential in nonvolatile storage,digital logic computing,artificial neural networks and nonlinear circuits.The memristor is capable of computing and storing simultaneously,which is expected to become the top choice for the new generation of digital logic circuits.This thesis is based on the memristor proposed by HP Lab to study the application of memristor in logic circuit.The main work of this thesis is as follows:(1)Based on the theory and the mathematical definition of memristor,the model proposed by HP Lab and several other models and their characteristics are further studied,which lays the foundation for the study of the applications based on memristor.(2)The IMP logic based on memristor is the first exploration of the memristor in the logic gate design.It was first proposed and validated by HP Lab.Based on the mechanism behind the IMP operation and the relationship between the IMP operation and the logic function,this thesis studies how to implement several common logic gate circuits in combination with the IMP logic and FALSE operation,and elaborates the implementation of constructing these logic gates.On this basis,an improved full adder based on the IMP logic circuit is put forward,and its detailed operation steps,the voltage sequence of the carry and the sum function are given.Compared with the full adder proposed by HP Lab,the proposed full adder is more advantageous in terms of the number of memristors and the sequence of operations.(3)MRL(Memristor Ratio Logic)is another design method for memristor logic circuit.This circuit method,which has a simpler circuit structure then the IMP logic,does not require redundant operaion sequences and is compatible with traditional CMOS circuits.The principle of the AND,OR7NAND,NOR gate circuit based on MRL logic is studied.Furthermore,the XOR gate based on IMP logic and MRL logic are compared.Finally,based on the adder,a multiplier circuit based on MRL is proposed and verified by simulation.(4)The MRL design method is further applied to the digital circuits.Based on the full-adder circuit presented in the Chapter 3,and for problems existing in the serial adder,such as slow execution speed,the MRL-based Carry Lookahead Adder(CLA)and an improved CLA are verified by theoretical analysis and simulations,which shows that the proposed design requires fewer memristors and CMOSs than the IMP-based and CMOS-based CLAs,meaning smaller circuit size and lower power consumption.