Thomson-csf

Claude Vergnolle

Christian Val

Dominique Broussoux

Jean-Marc Bureau

Francois Bernard

The strip is designed to optically interconnect a set of printed circuit boards mounted in a housing. It comprises:

Optical interconnection strip

The invention is a method of producing a multilayer polymer-metal system to interconnect integrated circuits which allows two-dimensional electrical and/or optical connections between components, in which a first layer of polymer is deposited on a rigid substrate such that the layer can be separated from the substrate, in which a multilayer interconnection system is then produced on this first layer using industrial methods and in which the rigid substrate is removed after installation and connection of the integrated circuit.

Process for manufacturing a multilayer integrated circuit interconnection

A step adjustable attenuator comprising a silicon substrate on one face of which are deposited thin film-type resistors and electrical conductors by which the resistors are interconnected. Contact points are arranged at the periphery of the substrate and connected to the resistors. However, the attenuating sections are not interconnected on the substrate. A conductive pattern prepared from a conductive film forms finger-like leads of which inner portions are bonded to the contact points. By its shape, the pattern ensures the interconnections between the sections and forms two rows of outputs, one for the connections on the printed-circuit board on which is implanted the attenuator and the other being associated with displaceable straps enabling attenuation to be adjusted.

Step adjustable attenuator

A field-effect transistor designed for high-power operation has a P.sup.+ substrate, preferably of gallium arsenide, topped by an N layer which in turn is covered by a much thinner N.sup.+ film, the layer and film being bisected by a serpentine trench so as to form a pair of interdigitated comb-shaped N.sup.+ segments overlain by metallic deposits which constitute a source and a drain electrode. The trench, advantageously produced by ion bombardment which also has a passivating effect on the surface areas thus exposed, cuts deep enough into the N layer to leave a channel whose conductivity is controlled by a gate electrode substantially coextensive therewith on the opposite substrate face. The prismatic substrate body is peripherally bounded by a mesa flank which may be passivated by a deposit of low-melting glass.

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Limours, France

Claude Vergnolle