Browse Prior Art Database

Binary Counting Circuit

IP.com Disclosure Number: IPCOM000097217D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Cheng, TH: AUTHOR

Abstract

The top left drawing shows a bistable cryogenic loop circuit. It includes two superconductor current paths 21 and 22 connecting a current source 10 to a current collector 11. Path 21 includes cryotron gating element 23 which has an associated control element 20. Path 22 includes an output conductor 15 which can serve as the control element for a cryotron gate (not shown). Path 22 also includes conductor 16. A segment of soft superconducting material 14, i. e., a segment of material similar to a cryotron gating element, is positioned in the vicinity of conductor 16. Segment material 14 is biased to near its switching point by current in conductor 17. When the current in conductor 16 is increased, element 14 is changed from the superconductor to resistive state.

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Binary Counting Circuit

The top left drawing shows a bistable cryogenic loop circuit. It includes two superconductor current paths 21 and 22 connecting a current source 10 to a current collector 11. Path 21 includes cryotron gating element 23 which has an associated control element 20. Path 22 includes an output conductor 15 which can serve as the control element for a cryotron gate (not shown). Path 22 also includes conductor 16. A segment of soft superconducting material 14, i. e., a segment of material similar to a cryotron gating element, is positioned in the vicinity of conductor 16. Segment material 14 is biased to near its switching point by current in conductor 17. When the current in conductor 16 is increased, element 14 is changed from the superconductor to resistive state. As element 14 thus changes, the inductance of conductor 16 is changed generating an electromotive force in conductor 16.

When a signal is applied to input conductor 20, gating element 23 is made resistive switching current from path 21 to path 22. The current in 22 increases as shown in the top right drawing. The current increases relatively rapidly until element 14 begins to change state. This is designated as point a. While element 14 is changing state the current in path 22 increases very slightly. After element 14 has completely changed state, the current in path 22 again increases in a relatively rapid manner. Hence, the current increase in 22 is delayed as element 14 changes state.

The control conductors for the gating elements and the conductors associated with element 14 are shown as...