Patent ID: 8289118

Claim:
A stacked inductor, comprising: a top layer metal coil; and at least two lower layer metal coils, all of the metal coils being aligned with each other, wherein adjacent ones of the metal coils are connected at corresponding ends thereof through a via, further wherein, each of the lower layer metal coils includes plural layers of metal lines which are interconnected, each of the plural layers of metal lines being formed of a solid material so as to not include any cavity, further wherein in each of the lower layer metal coils the respective plural layers of metal lines are interconnected by slots, further wherein the plural layers of metal lines are isolated from each other by dielectric layers, each of the slots being formed in a corresponding one of the dielectric layers, further wherein the top layer metal coil has a first thickness and each of the metal lines has a thickness smaller than that of the first thickness further wherein the plural layers of metal lines in one of the lower layer metal coils are connected in parallel to each other.