Studies On Logic Designs Based On Complementary Resistive Switches

A memristor has the advantages of a small feature size,high integrated density and scalability.Due to its great potential in storage,logic and analog signal processing,the memristor is also considered as a candidate of replacing CMOS transistor and causing technological revolution.The memristor includes bipolar resistive switch(BRS)and complementary resistive switch(CRS).However,the CRS can be widely applied in future for that it is suitable for reducing parasitic current that exists in the BRS crossbar and making the application of large passive crossbar arrays feasible.There are numerous research results in logic designs,such as material implication(IMP)family,the memristor ratioed logic(MRL)family,etc.Performing logic operations on memory not only can explore new ideas for the study of intelligent storage,and also can stimulate inspirations for breaking the classical von Neumann computer architecture.To further reduce the areas of integrated circuits and enrich memristor-based logic designs,this thesis proposes the designs of one-bit comparator and one-bit half adder using CRS crossbar units.First,base on the previous proposed finite state machine(FSM)of a single CRS unit,we summary the relationships of the CRS unit among outputs,inputs and states.Acording to the relationships,we realize a one-bit comparator with a CRS in 7 sequential cycles.Three functions of the one-bit comparator are realized in the same CRS unit.Second,we analyze the FSM of two CRSs which are connected via a wired and('&'),and then design a one-bit half adder with two CRS units in 5 cycles.Experimental results in SPICE show that the CRS crossbar units can perform the logic operations of one-bit comparator and one-bit half adder.The synthesis results using Design Compiler of Synopsis show that the crossbar units can realize the one-bit comparator and the one-bit half adder with three orders of magnitude less than those in 45 nm CMOS process.The designs also reinforce the logics of memristor-based crossbar arrays with further gains in terms of chip area,and integration density.The designs also project the possibility of applications for complex circuit designs with CRS crossbar units.