Patent ID: 6355535
Filing Date: 2002-03-12
Classification: H01F,H01L

Abstract:
A method of manufacturing an inductor with an air trench, which is applied in monolithic circuit processing, the method comprising the steps of:(a) providing a substrate having at least one insulator formed thereon; (b) forming a lower metal line, serving as a first connective line, on the insulator; (c) forming a lower dielectric layer, which has at least one via hole, on the lower metal line, wherein the via hole is filled with a first via plug for connecting the lower metal line; (d) forming a spiral metal line, one end of which is electrically connected to the first via plug, on the lower dielectric layer; (e) forming a dielectric layer, which has at least one via hole, on the spiral metal line, wherein the via hole is filled with a second via plug for connecting the spiral metal line; (f) repeating steps (a)-(e) to form a spiral inductor structure; (g) forming an upper spiral metal line having a second connective line, which is aligned with and electrically connected to the spiral inductor structure, over the substrate; (h) forming an upper dielectric layer on the upper spiral metal line and over the substrate; (i) forming a mask on the upper dielectric layer with only the part just above the spacing of the spiral inductor exposed; and (j) forming a spiral air trench in the upper dielectric layer and the dielectric layer by etching until the lower dielectric layer is exposed.