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# Three Junction Josephson Interferometer as Non Linear Logic Gate

IP.com Disclosure Number: IPCOM000052627D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 53K

IBM

## Related People

Beha, H: AUTHOR [+1]

## Abstract

A symmetric 3-junction current injection interferometer is employed as the basic switching device in a family of circuits, such as 2- or 4-input AND-gates or operational receivers, for signals transmitted over a long line. The proposed circuits permit high signal margins and are insensitive to supply current variations. They may be applied for latching and non-latching logic.

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Three Junction Josephson Interferometer as Non Linear Logic Gate

A symmetric 3-junction current injection interferometer is employed as the basic switching device in a family of circuits, such as 2- or 4-input AND-gates or operational receivers, for signals transmitted over a long line. The proposed circuits permit high signal margins and are insensitive to supply current variations. They may be applied for latching and non-latching logic.

Fig. 1 shows the equivalent circuit of the basic 3-junction interferometer used. The interferometer is symmetric, but the maximum Josephson currents differ: I(jL)=I(jR)=aI(o), I(jm)=bI(o). The input currents are injecte at points A and B, respectively. The output load R(L) is connected to point B.

Fig. 2 shows, for the parameter values indicated, the nominal threshold characteristic and the input signal tolerance window of a 2 input AND-gate employing the interferometer of Fig. 1. The input signals I(A) and I(B) are injected at points A and B, respectively. The same circuit can be used as an operational long-line receiver with the received signal injected at point B and the supply current fed at point A.

Fig. 3 shows, for the parameter values indicated, the nominal threshold characteristic and the input signal tolerance window of an 4-input AND-gate employing the interferometer of Fig. 1. Input signals I(A1) and I(A2) are injected at point A and input signals I(B1) and I(B2) at poi B.

Other characteristics can be obtained by ch...