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Persistent Current Ring Counter

IP.com Disclosure Number: IPCOM000098664D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Anderson, JL: AUTHOR [+2]

Abstract

Each stage of the superconductive ring counter circuit includes a number of cryotron coils and gates connected to form a closed superconductive loop capable of storing a persistent current.

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Persistent Current Ring Counter

Each stage of the superconductive ring counter circuit includes a number of cryotron coils and gates connected to form a closed superconductive loop capable of storing a persistent current.

The circuit is conditioned for operation by applying a start pulse at terminal 20 to drive gates G7, G10, G13 and G16 resistive and by also applying a current pulse at input terminal 22. The portion of this current which is initially directed through coil C2 causes gate G2 to be driven resistive so that the entire current is directed through gate G1. In a similar manner, the current is directed through gates G3 and G5 and back via lead 24 to a terminal 26 of persistent current loop
1. With gate G7 resistive the current is directed through the portion of this loop including coils C11 and C18, and gate G9.

The current pulse at start terminal 20 is terminated, allowing gate G7 to become superconductive. Then the pulse at terminal 22 is terminated causing a persistent current to be established in loop I which holds gates G1, G11 and G18 resistive. As a result, the next pulse applied at terminal 22 is directed into the portion of the second loop which includes coils C14 and C9, and gate G12. Gate G9 is driven resistive to quench the persistent current in loop 1 and allow gate G11 to become superconductive only when essentially all of the current

applied at 22 is in coil C9. Upon termination of the pulse applied at terminal 22, a persistent current is...