Patent ID: 8140292
Filing Date: 2012-03-20
Classification: H01J,H01L

Abstract:
1. A device for setting a voltage waveform at a platform supporting a substrate for etching using a plasma etching process, the device comprising: a waveform generator; a processor; and a computer-readable medium operably coupled to the processor, the computer-readable medium comprising instructions that, upon execution by the processor, perform operations which cause the device to (a) receive a first waveform for applying to an object; (b) calculate a first fast Fourier transform (FFT) of the received first waveform; (c) determine a second waveform for input to the waveform generator based on the received first waveform; (d) send the determined second waveform to the waveform generator; (e) generate a third waveform from the waveform generator for application to the object; (f) receive a fourth waveform measured across the object based on the generated third waveform; (g) calculate a second FFT of the received fourth waveform; (h) compare the received fourth waveform with the received first waveform to determine a convergence status of the received fourth waveform; (i) if the determined convergence status is not converged, calculate an updated waveform based on the calculated first FFT and the calculated second FFT and repeat (d)-(h) with the updated waveform as the determined second waveform; and (j) if the determined convergence status is converged, store the determined second waveform.