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Associative Cell with Don't Care Function using Josephson Junctions

IP.com Disclosure Number: IPCOM000085726D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Gueret, P: AUTHOR [+2]

Abstract

A two-junction interferometer (equivalent circuit: Fig. 1) is driven with the junctions having parameters L and I(m) such that (LI(m)/Phi(o)) > 1, resulting in an overlap of n and (n + 3) vortex modes, n being an integer. In addition, the cell is underdamped to the extent that switching between vortex modes always involves triple flux quantum transitions.

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Associative Cell with Don't Care Function using Josephson Junctions

A two-junction interferometer (equivalent circuit: Fig. 1) is driven with the junctions having parameters L and I(m) such that (LI(m)/Phi(o)) > 1, resulting in an overlap of n and (n + 3) vortex modes, n being an integer. In addition, the cell is underdamped to the extent that switching between vortex modes always involves triple flux quantum transitions.

Accordingly, the cell is capable of assuming "1" and "0" information states as well as a "Don't care" state, which leaves the content of the cell unchanged when a control current is applied.

If the cell is initially in the -1 mode at Ig = Ic = 0, application of a current +Ic will cause the cell to go into the +2 mode. On removal of Ic, the cell reverts to the -1 mode. With the cell initially in the +1 mode, application of a -Ic control current switches the cell to its -2 mode.

If the cell had been initially in the 0 mode at Ig - Ic = 0, application f + /-Ic would leave the state of the cell unchanged (Don't care).

This cell can be used in a memory array for associative addressing, the cell acting as a decoder in which the addresses of the words in the data array are prestored.

The addresses of words consist of sets of 1's and 0's which are

This cell can be used in a memory array for associative addressing, the cell acting as a decoder in which the addresses of the words in the data array are prestored.

The addresses of words consist of sets of 1...