Browse Prior Art Database

Polarity Converter

IP.com Disclosure Number: IPCOM000085727D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Kotyczka, W: AUTHOR [+3]

Abstract

The converter of Fig. 1 consists of four Josephson gates (single junctions, interferometers) arranged in a bridge-type configuration, with each branch of the bridge having one gate controllable by a selectively applicable control current for selectively switching the gates between their superconducting and normal-conducting states, one pair of diagonally opposite connections of the bridge being connected to a bias current source, the other pair of connections being coupled to a superconductive loop.

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Polarity Converter

The converter of Fig. 1 consists of four Josephson gates (single junctions, interferometers) arranged in a bridge-type configuration, with each branch of the bridge having one gate controllable by a selectively applicable control current for selectively switching the gates between their superconducting and normal- conducting states, one pair of diagonally opposite connections of the bridge being connected to a bias current source, the other pair of connections being coupled to a superconductive loop.

To obtain current in the loop, the opposite gates L and 3 are switched off by a control field. The current is then diverted into the loop to flow in the direction of arrow 5.

The loop current is switched off by removing the control field from gate 1 and applying a field to gate 2. If the field at gate 3 is switched off and a field applied to gate 4, current is diverted into the loop to flow in the direction of arrow 6.

The converter is improved by adding gate 7 in the north-south diagonal (Fig.
2). The switching scheme is simplified in that one less driver is required. Both circuits have small inductances L1, L2, L3 to prevent current overshoot.

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