Patent ID: 6031445
Filing Date: 2000-02-29
Classification: H01F,H01L,Y10T

Abstract:
In an integrated circuit comprising a substrate with a horizontal upper surface, a transformer characterized in that it comprises:a first plurality of conductive lines arranged in a first layer on the upper surface of the substrate;a second plurality of conductive lines arranged in a second layer, vertically separated from the first plurality of conductive lines by a first insulating layer;a third plurality of conductive lines arranged in a third layer, vertically separated from the second plurality of conductive lines by a second insulating layer;a fourth plurality of conductive lines arranged in a fourth layer, vertically separated from the third plurality of conductive lines by a third insulating layer;first conductive vias extending through second insulating layer, connecting said second and third pluralities of conducting lines, whereby said second and third pluralities of conducting lines and said first conductive vias form a first winding; andsecond conductive vias extending through first, second and third insulating layers, connecting said first and fourth pluralities of conducting lines, whereby said first and fourth pluralities of conducting lines and said second conductive vias form a second winding, about and approximately concentric with said first winding.