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Its headquarters is in San Francisco, with offices in New York, Chicago, London and Dublin. A method of controlling a photolithography process includes forming a first layer on a selected wafer.A first overlay error associated with the first layer is measured.

Layers of materials are added, removed, and/or treated during fabrication to create the electrical circuits that make up the device.Quantcast is an American technology company, founded in 2006, that specializes in audience measurement and real-time advertising.The company offers public access to traffic and demographic data for millions of Web sites and detailed user insights to digital publishers enrolled in its Quantified Publisher Program.Proper fonnation of sub-sections within a semiconductor device is an important factor in ensuring proper performance of the manufactured semiconductor device.Critical dimensions of the sub-sections generally have to be within a predetermined acceptable margin of error for semiconductor devices to be within acceptable manufacturing quality.METHOD AND APPARATUS FOR CONTROLLING PHOTOLITHOGRAPHY OVERLAY REGISTRATION INCORPORATING FEEDFORWARD OVERLAY INFORMATION TECHNICAL FIELD This invention relates generally to the field of semiconductor device manufacturing and, more particularly, to a method and apparatus for controlling photolithography overlay registration incorporating feedforward overlay infonnation.

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