Patent ID: 7453142

Claim:
A transformer system, comprising: a package substrate having a substantially planar surface; a plurality of electrically conductive pads arranged in spaced apart relationship relative to each other; a first winding defined by a first electrically conductive path between a first input and a first output, the first electrically conductive path including at least one wire connected between at least one first pad pair of the electrically conductive pads, at least one electrically conductive pad of each first pad pair being at the substrate surface; a second winding defined by a second electrically conductive path between a second input and a second output, the second electrically conductive path including at least one wire connected between at least one second pad pair of the electrically conductive pads, at least one electrically conductive pad of each second pad pair being at the substrate surface; a semiconductor die having substantially opposing first and second surfaces, the first surface being spaced apart from the substrate surface, the second surface being attached to a portion of the substrate; and wherein the plurality of electrically conductive pads includes at least a first pad set located at the substrate surface and at least a second pad set located at the first surface of the die, the first pad set and the second pad set being arranged in juxtaposition relative to each other, at least two pads of the first pad set being connected with corresponding electrically conductive pads of the second pad set by wires and the first and second electrically conductive paths being proximal each other to achieve a magnetic field coupling between the first and second windings so as to form a transformer.