Patent ID: 7208388

Claim:
A method of making integrated circuit thin film resistor structures each including a body section and a head section, the method comprising: (a) forming a first dielectric layer having a planar surface over a substrate; (b) providing a structure to reduce variation of head resistivity of the head section by i. forming a first dummy fill layer on the planar surface of the first dielectric layer, and ii. forming a planar second dielectric layer over the first dummy fill layer; (c) forming a thin film resistor on the planar second dielectric layer; (d) forming a first inter-level dielectric layer on the thin film resistor and the planar second dielectric layer; and (e) forming a first metal layer on the first inter-level dielectric layer, a first portion of the first metal layer extending to a portion of the thin film resistor through a contact opening in the first inter-level dielectric layer.