Patent ID: 8659167
Filing Date: 2014-02-25
Classification: B81C,H01L

Abstract:
1. A method of forming a sensor package comprising: bonding a sensor wafer, a cap wafer, and at least one controller element together such that a first inner surface of said cap wafer is coupled to a second inner surface of said sensor wafer to form a sensor structure and a bottom side of said at least one controller element is coupled to an outer surface of said sensor structure to form a stacked wafer structure, wherein said sensor wafer includes a plurality of sensors encapsulated by said cap wafer, a first one of said cap wafer and said sensor wafer includes a substrate portion with first bond pads located on a corresponding one of said first and second inner surfaces and a second one of said cap wafer and said sensor wafer conceals said substrate portion, and a top side of said at least one controller element includes control circuitry and second bond pads; removing a first material section from said second one of said sensor wafer and said cap wafer to expose said substrate portion having said first bond pads; forming electrical interconnects between said first and second bond pads; and singulating said stacked wafer structure to produce said sensor package.