Patent ID: 8471357
Filing Date: 2013-06-25
Classification: H01L

Abstract:
1. An integrated inductor structure, comprising: a semiconductor substrate; a metal coil layer on the semiconductor substrate; at least one dielectric layer between the semiconductor substrate and the metal coil layer; a well shielding layer disposed in the semiconductor substrate directly under the metal coil layer, wherein the well shielding layer has an outer area comprising a plurality of peripheral N type diffusion regions surrounding an inner area chequered with a plurality of N type diffusion regions and a plurality of P type diffusion regions, and wherein the plurality of peripheral N type diffusion regions do not overlap with the metal coil layer; a P type pick-up ring disposed in the semiconductor substrate, wherein the P type pick-up ring surrounds the well shielding layer; and a guard ring disposed directly over the P type pick-up ring, the guard ring comprising a plurality of metal layers and a plurality of via plugs, wherein the guard ring includes an opening for allowing connection of the metal coil layer to an external circuit.