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Josephson Logic Gate

IP.com Disclosure Number: IPCOM000079226D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Jutzi, WW: AUTHOR

Abstract

A Josephson logic gate with at least two input control lines works essentially in the way of a cross-line gate. Since that type of gate has a current gain larger than unity, it can feed several output lines.

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Josephson Logic Gate

A Josephson logic gate with at least two input control lines works essentially in the way of a cross-line gate. Since that type of gate has a current gain larger than unity, it can feed several output lines.

In so-called in-line gates with gate line and control line fields in parallel, the control line field is independent of control line width (Hi = Ic/w). In cross-line gates, the maximum control field in the Josephson junction is independent of the gate line width (Hc = Ic/L). As L can be made much smaller than w, the magnetic field per unit control current can be much larger than that per unit gate current.

A single Josephson junction is provided with two crossing control lines combined of in-line and cross-line sections. The width w of the junction is chosen considerably larger than the junction length L to obtain high-current gain. At either side, the magnetic field of another cross-line is effective. In the junction center area both control lines are bent at right angles such that both lines can be arranged in the same plane. Effective for control are the cross-line sections; the influence of the in-line sections is negligible. Several output lines may be provided parallel to the junction.

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