Patent ID: 6724612
Filing Date: 2004-04-20
Classification: G01D,G01N

Abstract:
A semiconductor-based humidity sensor, comprising:a substrate; a first insulator layer formed on said substrate; a first capacitor plate formed on said first insulator layer; at least one first contact associated with said first capacitor plate formed on said first insulator layer; a second capacitor plate formed on said first insulator layer; at least one second contact associated with said second capacitor plate formed on said first insulator layer; an electrically insulative barrier formed in a gap between said first capacitor plate and said second capacitor plate, wherein said first capacitor plate and said first contact and said second capacitor plate and said second contact define a first stray capacitor; a humidity-sensitive dielectric layer formed on said first insulator layer, said first capacitor plate and said second capacitor plate; and a porous, electrically-conductive plate formed on said humidity-sensitive dielectric, wherein said porous, electrically-conductive plate is a common top plate to said first and second capacitor plates of a respective first series capacitor Cx1 and second series capacitor Cx2.