Patent ID: 7868999
Filing Date: 2011-01-11
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: a plurality of control circuits, each control circuit arranged to be connected to an associated radiation source of a plurality of radiation sources configured to generate pulses of radiation for projection onto a substrate and each control circuit arranged to control the associated radiation source such that the pulses generated by that associated radiation source have a desired energy and a desired repetition rate, wherein at least one of the control circuits comprises two integrators and an amplifier which is connected in parallel with one of the integrators; a support structure configured to support a patterning device, the patterning device configured to pattern the radiation; a substrate table configured to hold the substrate; and a projection system configured to transfer the radiation pulses as patterned onto the substrate, wherein the pulses of each of the plurality of radiation sources are not transferred by the projection system in respective separate paths spatially arranged across the optical axis of the projection system and, for each radiation source, at least one other radiation source generates a pulse between successive radiation pulses of that radiation source.