Patent ID: 6133987
Filing Date: 2000-10-17
Classification: B82Y,H01J

Abstract:
An electron-beam lithography system for transferring an image from a reticle to a wafer, comprising:a reticle divided into subfields disposed in n rows and m columns;a wafer;an electronic lens system disposed between the reticle and the wafer for directing an electron beam from each subfield to an appropriate position on the wafer;wherein the electronic lens system comprises a first section for deflecting the electron beam from each subfield to an electronic optical axis of the electronic lens system, a second section for demagnifying the electron beam and a third section for deflecting the electron beam emerging from the second section to the appropriate position on the wafer;a first switch for switching between m first sources that provide inputs to a deflection system in the first section of the electronic lens system;a first error DAC for correcting a position error in the input from the first switch;wherein the input from the first switch deflects a centerline of the electron beam from each subfield to within a range from the electronic optical axis of the electronic lens system in accordance with the following condition:M.multidot.A.multidot.2.sup.B =R.sub.R,wherein R.sub.R is the range within which the input from the first switch is designed to deflect the electron beam from each subfield in the reticle to the electronic optical axis, A is the desired accuracy of the electron-beam lithography system at the wafer, B is the accuracy of the first error DAC and M is the magnification of the second section for demagnifying the electron beam.