Browse Prior Art Database

Superconductive Transformer

IP.com Disclosure Number: IPCOM000098082D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Anderson, JL: AUTHOR [+2]

Abstract

A superconductive transformer provides an impedance match between thin film superconductive circuits and input and output connections. It also provides interconnections between various substrate planes. The transformer converts the impedance of the thin film circuit to 50 ohms. At this level conventional transmission lines are employed to connect to an external indicator or, in conjunction with a second transformer, to connect to a second thin film circuit.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Superconductive Transformer

A superconductive transformer provides an impedance match between thin film superconductive circuits and input and output connections. It also provides interconnections between various substrate planes. The transformer converts the impedance of the thin film circuit to 50 ohms. At this level conventional transmission lines are employed to connect to an external indicator or, in conjunction with a second transformer, to connect to a second thin film circuit.

A typical thin film superconductive circuit employs film widths of 0.018 inches spaced above a ground plane a distance of 8 x 10/-5/ cm. and insulated from it by a material having a dielectric constant of 5. These circuits exhibit a characteristic impedance of 0.294 ohms. A transformer having a turns ratio of 13:1 then provides the proper impedance match to the 50 ohm level.

The transformer is formed of superconductive material in a stacked configuration with n/2 layers of the primary formed first, then a single secondary layer, and finally the remaining n/2 layers of the primary, all encased within a lead shield. The lead shield minimizes the coupling to other circuits by confining all the flux to the volume occupied by the transformer windings.

This configuration minimizes leakage flux, assures tight coupling. It is fabricated by the vacuum deposition of the superconductive and insulating layers at the same time the thin film circuits are evaporated. Since the transformer is fabri...