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Josephson Soliton Combinatorial Logic

IP.com Disclosure Number: IPCOM000041965D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03

Publishing Venue

IBM

Related People

Authors:
Kaplan, SB Stuck, G [+details]

Abstract

Recording the passage of solitons in combinatorial logic as changes in the circulating currents of Superconducting Quantum Interference Devices (SQUIDs) in the logic devices solves the timing difficulty in performing combinatorial logical functions with soliton pulses. It is difficult to perform logical operations with pulsed logic signals. As an example, consider a 2-input AND gate: two pulses must be present in order to insure the correct AND operation, but it is very difficult to insure the simultaneous presence of two extremely short pulses. For this reason proposed logical operations with Josephson solitons have been limited to Programmable Logic Arrays (PLAs) in which soliton pulses are steered with logic levels. However, such simple arrays offer only two-stage logic.