Patent ID: 8441333

Claim:
A stacked inductor with multiple layers of different metal thickness and metal width comprises: a top metal trace with a first predetermined width; the inductor starting from an outer port of metal coil on the top metal trace; a bottom metal trace with a second predetermined width; the top metal trace is connected to the bottom metal trace at an inner port through via holes; the bottom metal trace comprises an outer port wherein the outer port of the bottom trace being a port of the inductor; edges of the top and the bottom metal traces being aligned to each other; the thickness of the top metal trace is larger than the thickness of the bottom metal trace; a maximum second predetermined width is larger than a maximum first predetermined width; a maximum space between metals of the top metal trace is larger than a maximum space between metals of the bottom metal trace; the top and bottom metal traces being connected; and the stacked inductor is spired and the shape of the stacked inductor is selected from the group consisting of octagon, polygon and circle.