METHOD FOR PREPARING A PATTERN TO BE PRINTED ON A PLATE OR MASK BY ELECTRON BEAM LITHOGRAPHY, CORRESPONDING PRINTED CIRCUIT DESIGN SYSTEM AND COMPUTER PROGRAM

摘要

A method for preparing a pattern to be printed on a plate or mask by electron beam lithography comprising the following steps: modelling of the pattern by breaking down this pattern into a set of elementary geometric shapes intended to be printed individually in order to reproduce said pattern and, for each elementary geometric shape of the model; determination of an electrical charge dose to be applied to the electron beam during the individual printing of the elementary shape, this dose being chosen from a discrete set of doses including several non-zero predetermined doses recorded in memory. The set of elementary geometric shapes is a bidimensional paving of identical elementary geometric shapes covering the pattern to be printed. In addition, when the doses to be applied to the elementary geometric shapes are determined, a discretisation error correction is made by dithering.