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Browse Prior Art Database

Pulse Shaping Circuitry

IP.com Disclosure Number: IPCOM000097124D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Conroy, ED: AUTHOR

Abstract

This circuit shapes and times the leading and trailing edges of a pulse. It includes four dual-control cryotrons 1, 2, 3 and 4. These are connected in two loop circuits. One control of 1 and 2 is connected to a variable bias line. The second control of 1 and 2 is connected to an input line. The controls for 3 and 4 are respectively connected to the outputs of 1 and 2. The two control lines for 3 and 4 are respectively connected in series.

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Pulse Shaping Circuitry

This circuit shapes and times the leading and trailing edges of a pulse. It includes four dual-control cryotrons 1, 2, 3 and 4. These are connected in two loop circuits. One control of 1 and 2 is connected to a variable bias line. The second control of 1 and 2 is connected to an input line. The controls for 3 and 4 are respectively connected to the outputs of 1 and 2. The two control lines for 3 and 4 are respectively connected in series.

A current is applied by switching current from input line 10 to input line 11 (or vice versa). Sufficient current is supplied to bias line 12 so that, when there is current in line 10 and no current in line 11, the gate of 1 is superconducting and the gate of 2 is resistive. As current is switched from line 10 to line 11, the gate of 1 becomes resistive before the gate of 2 becomes superconductive. When the gates of both cryotrons are resistive, half of the current which is flowing from current source 15 is switched from line 16 to line 17.

As more current is switched from line 10 to line 11, the gate of 2 becomes superconducting, switching all the current from current source 15 from line 16 to line 17. The condition which exists when half of the current is switched from line 16 to line 17 is not sufficient to change the state of cryotrons 3 and 4. However, when all of the current is switched from line 16 to line 17, the gate of 4 becomes superconducting and the gate of 3 becomes resistive. This switches...