Chaotic oscillations in SQUIDs for logic circuits

Novel memory and several logic circuits utilizing the chaotic oscillations produced in SQUIDs are proposed. First? the oscillation modes that can be p roduced in a SQUID circuit are analyzed. The results of simulation for the SQUID show that there exist four types of oscillations: periodic, subharmon ic, chaotic and relaxation oscillations, The bifurcation diagram of oscilla tion waveforms reveals that the hysteresis phenomena in the relation betwee n the terminal voltage or the current and the external flux appear and that these phenomena can be used for a memory operation. Secondary, novel digit al circuits such as memory, Exclusive-OR and full adder circuits are propos ed by utilizing the chaotic oscillations. In these digital circuits the cha otic oscillations are made correspond to the logic "1," while the periodic and subharmonic oscillations are made to the logic "0". In order to investi gate how these digital circuits perform their functional computer simulatio ns are made. The simulation results show that the right operations can be a chieved.