Patent ID: 7927185
Filing Date: 2011-04-19
Classification: B24B

Abstract:
1. A method of processing a semiconductor wafer using a double side grinder, the grinder comprising a pair of grinding wheels, a processor, and a pair of hydrostatic pads, the grinding wheels and hydrostatic pads being operable to hold a generally flat workpiece in a plane with a first part of the workpiece positioned between the grinding wheels and a second part of the workpiece positioned between the hydrostatic pads, the grinder comprising a plurality of sensors operable to measure a distance between the workpiece and the respective sensor, at least some of the sensors being spaced apart in at least one of an x direction and a y direction in an x, y, z orthogonal coordinate system defined so the workpiece is held in the x, y plane, the method comprising measuring a distance between the wafer and at least one of the sensors and determining wafer nanotopology using the measured distance, wherein the determining comprises using the processor to perform a finite element structural analysis of the wafer based on the measured distance.