Patent ID: 6521903
Filing Date: 2003-02-18
Classification: H01J

Abstract:
A drive circuit for a charged particle beam lithographic exposure tool including a plurality of yokes, said drive circuit comprising:a digital to analog converter (DAC) receiving digital deflection data and generating therefrom a common deflection signal; a programmable attenuator for each of said plurality of yokes receiving said common deflection signal and generating therefrom a scaled individual signal proportional to said deflection data; and a power amplifier for each of said plurality of yokes receiving a corresponding scaled individual signal from a corresponding said programmable attenuator and generating a yoke control signal therefrom whereby a plurality of deflection control signals are made proportional to said common deflection signal other than such that G1/G2=M where G1 and G2 are gain or attenuation factors of deflection drivers in the reticle and target stages, respectively, and M is the demaginification factor of the lens system.