Abstract: A miniature power supply and voltage regulator containing a ceramic substrate with conductive metal bonded to the top and bottom of the substrate. The power supply contains a first device for converting alternating current to direct current, a device means for converting alternating current to direct current, a device for determining the current demands of a load, and a device for delivering the current demands to the load. The said power supply and voltage regulator has a power handling capability of at least 23 watts per square inch of surface area.

Abstract: A bumped substrate assembly comprising an alumina substrate a layer of copper on the alumina substrate, and a heterogeneous juncture band between the alumina the copper layer. Copper bumps integrally connected to the copper layer extend therefrom; the copper in the copper layer and the copper bumps is substantially identical. The heterogeneous juncture band has a copper-wetted surface area that is at least about twice the apparent surface area of the copper overlying the first juncture band and consisting essentially of alumina grains unitary with the copper layer and being constituted by finger-like copper protuberances unitary with the copper layer and occupying the space between the alumina grains.