Patent ID: 8124490

Claim:
A method of making a semiconductor device, comprising: providing a substrate; and forming a first passive device and a second passive device separate from the first passive device over the substrate by, (a) depositing a first passivation layer over a portion of the substrate encompassing the first and second passive devices, wherein the first passivation layer contacts an upper surface of the substrate, (b) depositing a first resistive layer over a portion of the first passivation layer encompassing the first and second passive devices, wherein the first resistive layer contacts an upper surface of the first passivation layer and the first passivation layer electrically isolates the first resistive layer from the substrate, (c) depositing a first conductive layer over a portion of the first resistive layer encompassing the first and second passive devices, wherein the first conductive layer contacts an upper surface of the first resistive layer, and wherein the first resistive layer comprises a first conductive material having a relatively high resistivity compared to the first conductive layer, (d) depositing a second resistive layer over a portion of the first conductive layer encompassing the first and second passive devices, wherein the second resistive layer contacts an upper surface of the first conductive layer, the second resistive layer comprising a second conductive material having a relatively high resistivity compared to the first conductive layer, (e) depositing an insulating layer over a portion of the second resistive layer encompassing the first and second passive devices, (f) depositing a second conductive layer over a portion of the insulating layer encompassing the first and second passive devices, and after performing the depositing steps (a)-(f), (g) etching a portion of the second conductive layer to expose the insulating layer while leaving a remaining portion of the second conductive layer, (h) etching the insulating layer and second resistive layer and halting the etching when a top surface of the first conductive layer is exposed, to leave a remaining portion of the insulating layer and second resistive layer under the remaining portion of the second conductive layer, and (i) etching the first conductive layer until a top surface of the first resistive layer is exposed, to leave a first remaining portion of the first conductive layer under the remaining portion of the insulating layer and second resistive layer and further leaving a second remaining portion of the first conductive layer over the first resistive layer, wherein the remaining portion of the second conductive layer, remaining portion of the insulating layer and second resistive layer, and first remaining portion of the first conductive layer constitute the first passive device.