Multi-layer inductor and transformer

A generally planar transformer generally lying in a base plane defining mutually orthogonal in-plane azimuth and radial directions, the generally planar transformer comprising:

• a generally planar first coil portion generally disposed in the base plane and comprising a plurality of substantially concentric first coil loops comprising an innermost first coil loop and an outermost first coil loop, each of the first coil loops comprising a plurality of elongated first layers elongated and extending along the azimuth direction and stacked along the radial direction, the plurality of elongated first layers comprising at least one electrically conductive first layer and at least one adhesive first layer;
• and
• a generally planar core portion generally disposed in the base plane and, at least partially, in an opening defined by the innermost first coil loop of the first coil portion and comprising a plurality of second layers stacked along one of the radial direction and a height direction orthogonal to the base plane, the plurality of second layers comprising at least one magnetically permeable second layer and at least one adhesive second layer.