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Self-Resetting Cryotron Circuitry

IP.com Disclosure Number: IPCOM000098088D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Smith, JL: AUTHOR [+2]

Abstract

The upper drawing shows the logical functions which the lower circuit generates. The circuit has four inputs, A, bar A, B and bar B. At any particular time either A or bar A is active. Likewise, at any particular time either B or bar B is active. The circuit has four outputs, which relate to the four functions A B, A bar B, bar A B and bar A bar B. One of these outputs is active at any one time.

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Self-Resetting Cryotron Circuitry

The upper drawing shows the logical functions which the lower circuit generates. The circuit has four inputs, A, bar A, B and bar B. At any particular time either A or bar A is active. Likewise, at any particular time either B or bar B is active. The circuit has four outputs, which relate to the four functions A B, A bar B, bar A B and bar A bar B. One of these outputs is active at any one time.

There are four loop circuits 31... 34 connected in series between the current source 21 and the current collector 22. Each loop 31... 34 has two current paths C and D and a cryotron gate (rectangle) connected in series with each path. Outputs are obtained by having one current path for each loop connected in series with the control lines for other gates. The control lines for the other cryotron gates (not shown) are designated by the dotted lines.

Each cryotron gate has three control lines, two of which are shown. One (not shown) is connected to a fixed bias current. This flows in a direction opposite to the direction of the current in the gate itself. Each gate is made resistive by two current units flowing in the three control lines of the gate. This is in a direction opposite to the direction of the current in the gate itself. Each gate, connected in series with a current path C, has two units of bias current applied to it. Each gate, connected in series with current path D, has one unit of bias current applied to it.

The control lines...