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Complementary Current Switch Logic

IP.com Disclosure Number: IPCOM000082710D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Schuenemann, C: AUTHOR

Abstract

Logic circuits with Josephson junctions can be designed using the scheme of switching a current from one path to another. To provide for automatic reswitching as the input signals reset, it is necessary that the two paths of the circuit in Fig. 1 be arranged for logic signals which are mutually complementary.

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Complementary Current Switch Logic

Logic circuits with Josephson junctions can be designed using the scheme of switching a current from one path to another. To provide for automatic reswitching as the input signals reset, it is necessary that the two paths of the circuit in Fig. 1 be arranged for logic signals which are mutually complementary.

With path 1 designed with an inherent AND function, and path 2 with an inherent OR function, output lines 3 and 4, respectively, supply F = A + B = A . B and F = A . B.

A more complex circuit is shown in Fig. 2, where the OR function path comprises two Josephson junctions in series. Depending on the direction of the input currents, this circuit may also be operated as an exclusive OR gate. To avoid increased loop inductance brought about by long output lines, the basic circuit may be combined with drivers in terminated loop technology, as shown in Fig. 3.

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