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Browse Prior Art Database

AC Powered Soliton Device

IP.com Disclosure Number: IPCOM000041975D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Rajeevakumar, TV: AUTHOR [+2]

Abstract

Flux tubes serve as AC coupled unidirectional soliton devices usable as modular devices in the construction of soliton circuits. If a pulse is fed into a soliton device (long junction), it will propagate through as a soliton only if the bias current of the (junction) has the same polarity as the input pulse. Thus, logic decisions can be made. In this case the bias current is the logical input. It is difficult to distribute the logic input (bias) in DC powered devices because, during the risetimes of the bias pulses, sneak path currents tend to flow between the input and output of the devices which are generally coupled through small resistors. It has been proposed to use two junction interferometers in which each junction is an active soliton device.

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AC Powered Soliton Device

Flux tubes serve as AC coupled unidirectional soliton devices usable as modular devices in the construction of soliton circuits. If a pulse is fed into a soliton device (long junction), it will propagate through as a soliton only if the bias current of the (junction) has the same polarity as the input pulse. Thus, logic decisions can be made. In this case the bias current is the logical input. It is difficult to distribute the logic input (bias) in DC powered devices because, during the risetimes of the bias pulses, sneak path currents tend to flow between the input and output of the devices which are generally coupled through small resistors. It has been proposed to use two junction interferometers in which each junction is an active soliton device. Upon transmitting solitons, however, the junctions are coupled and the operating margins degrade significantly (from + 70% to + 33% in Ibias/I0). A solution is to use a flux tube (Fig. 1) which is a loop containing one junction. The potential energy of such a device (vs. c) is shown in Fig. 2. If the AC coupled current IT is applied, the device can phase a soliton through the junction, and only one. At the end of the cycle, when IT is removed, the device resets back into its original state. The flux tube can be used as a modular device in the construction of soliton circuits.

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