Patent ID: 6862545
Filing Date: 2005-03-01
Classification: G01B,G03F

Abstract:
1. A method for calibrating a linewidth measurement tool while employing a linewidth standard comprising: providing a linewidth standard comprising a series of topographic features; measuring periodically within at least one single location within the linewidth standard a linewidth of a topographic feature while employing a linewidth measurement tool, to thus obtain a series of periodic actual measurements; mathematically regressing the series of periodic actual measurements to obtain a corresponding series regressed data points; determining a series of deviations between the series of periodic actual measurements and the series of regressed data points; determining from the series of deviations a series of exponentially weighted moving averages for the series of periodic actual measurements; and correcting each of the periodic actual measurements by a corresponding exponentially weighted moving average to provide a series of corrected periodic actual measurements.