Patent ID: 7167072

Claim:
A method of fabricating an inductor formed on a substrate having at least one first dielectric layer thereon, the method comprising: forming a patterned first metal layer and a first inductor pattern within the first dielectric layer; forming a patterned second dielectric layer on the first dielectric layer for covering the first metal layer, the first inductcor pattern and the first dielectric layer, the second dielectric layer having an opening and a circular-spiral trench, wherein the opening exposes the first metal layer and the circular-spiral trench exposes the first inductor pattern; filling a metal within the opening and the circular-spiral trench for forming a second metal layer within the opening and a second inductor pattern within the circular-spiral trench, wherein the second metal layer directly contacts with the first metal layer and the second inductor pattern directly contacts with the first inductor pattern; and forming a patterned third metal layer on the second metal layer and a third inductor pattern on the second inductor pattern, wherein the third metal layer directly contacts with the second metal layer, the third inductor pattern directly contacts with the second inductor pattern, and the first inductor pattern and the third inductor pattern are not completely overlapping, only flowing along the third inductor pattern when the current second time flows through the area.