Patent ID: 8461656
Filing Date: 2013-06-11
Classification: B81B,B81C,G01P,H01L

Abstract:
1. A device structure, comprising: a substrate, a first insulating layer on the substrate; a conductive layer having an isolated conductive region separated from a remaining portion of the conductive layer by an opening in the conductive layer that surrounds the isolated conductive region; a second insulating layer over the isolated conductive region having an opening over the isolated conductive region; a movable conductive finger over the opening in the second insulating layer that forms a first capacitor with the isolated conductive region that varies in capacitance based on movement of the movable conductive finger; conductive polysilicon running directly from a location on the isolated conductive region to a bonding feature above a top surface of the device structure, wherein the conductive polysilicon is orthogonal to a top surface of the isolated conductive region, wherein the bonding feature in contact with a cap wafer in which the cap wafer has an electrode over the movable finger to form a capacitance with the movable finger that varies inversely with variations in the capacitance of the first capacitor due to movement of the movable finger.