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In-line Cryotron Without Inductive Coupling For Bifilar Circuits

IP.com Disclosure Number: IPCOM000098086D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Sanborn, JL: AUTHOR

Abstract

The drawings show an inline cryotron without inductive coupling for readout of bifilar circuits.

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In-line Cryotron Without Inductive Coupling For Bifilar Circuits

The drawings show an inline cryotron without inductive coupling for readout of bifilar circuits.

Control conductor 1 has two hard superconductive segments 1a and 1b folded over with respect to gate conductor 2. Gate 2 has hard superconductive segment 2a and soft superconductive segment 2b. Segments 1a and 1b and segments 2a and 2b are of equal width. For clarity, they are shown varied in A. Gate 2 is arranged in figure-eight configuration to align segments 2a and 2b in stacked arrangement between segments 1a and 1b. Thus, gate current I(G) flows along segments 2a and 2b in the same direction. Due to shielding effects, the gate current I(G) flows only along the upper and lower surfaces of segments 2a and 2b, respectively. Variations in control current I(C) induce equal and opposite currents along the upper and lower surfaces of segments 2a and 2b, respectively.

When the soft superconductive segment 2b is switched to a resistive state, the voltage across gate conductor 2 is SEE EQUATION. The coefficients of inductive coupling M1 and M2 between segments 1a and 1b and segments 2a and 2b, respectively, are approximately equal. R(G) is the resistance of gate conductor segment 2a. Segment 2b is normally superconductive and functions as a dummy gate. This compensates for variations in the control current I(C) to maintain voltage across gate conductor 2 constant when segment 2a is switched resistive.

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