Patent ID: 7898447
Filing Date: 2011-03-01
Classification: G03F,H01J,H03M

Abstract:
1. A digital-to-analog converter (DAC)/amplifier testing system for use in an electron-beam (e-beam) mask writer, the e-beam mask writer including a plurality of DAC/amplifier circuits to output analog voltage signals, each DAC/amplifier circuit having a first output terminal and a second output terminal, the first output terminals of the plurality of DAC/amplifier circuits being respectively coupled to deflection plates of the e-beam mask writer to provide the output analog voltages as deflection voltages, the testing system comprising: a summation circuit, coupled to receive the output analog voltage signals on the second output terminals, to sum the received voltage signals and to output a summation signal indicating the sum of the received analog voltage signals; and an analyzer circuit comprising: