Patent ID: 6380835
Filing Date: 2002-04-30
Classification: H01F

Abstract:
A symmetric dual-layer spiral inductor incorporating spirals, each spiral having N number of turns, N being a natural number greater than or equal to 1, comprising:a substrate; a top metal patterned layer provided with a 1st group of N number of first metal lines and a 2nd group of N number of second metal lines; a bottom metal patterned layer, disposed between the substrate and the top metal patterned layer, provided with a 1st group of N number of third metal lines and a 2nd group of N number of fourth metal lines, each of the metal lines having a 1st and a 2nd end and an inner metal line size being smaller than that of an outer metal line, each of 1st ends of the first metal lines being electrically connected to a 1st end of the corresponding fourth metal line, a 2nd end of the fourth metal line being electrically connected to a 2nd end of a first metal line having a turn number of one less than that of the previous first and fourth metal line, a 2nd end of a fourth metal line having a smallest turn number being connected to that of a third metal line having a smallest turn number, each of the 1st ends of the third metal lines being electrically connected to a 1st end of a corresponding second metal line and a 2nd end of the corresponding second metal line being electrically connected to a 2nd end of a third metal line having a turn number of one greater than that of the previous second and third metal line; and an insulating material surrounding each of the metal lines.