Patent ID: 8073646
Filing Date: 2011-12-06
Classification: H01J

Abstract:
1. A plasma processing apparatus comprising: a processing chamber that accommodates a substrate to be processed therein and capable of being exhausted to a vacuum level; a gas supply unit that supplies a process gas into the processing chamber to perform a plasma process; an exhaust unit that exhausts the process gas used to perform the plasma process; a radio frequency generator, which includes a data input terminal to which a set power level of radio frequency power and an offset level for calibrating output power are inputted as digital data and a power output terminal that outputs the radio frequency power, capable of adjusting a target output power level based on the set power level and the offset level to output radio frequency power corresponding to the target output power level via the power output terminal; a matching unit, connected to the radio frequency generator via a transmission line, that matches an impedance of a radio frequency generator side with an impedance of a chamber side; an electrode, provided in the processing chamber, to which radio frequency power from the matching unit is applied; a power detection unit, interposed between the transmission line and the matching unit, that measures a radio frequency power level fed to the matching unit; and a generator control unit that, when calibrating the radio frequency generator, controls the radio frequency power from the power output terminal of the radio frequency generator such that the radio frequency power level fed to the matching unit reaches the set power level by calculating the offset level based on the difference between the set power level and the power level measured by the power detection unit and transmitting the set power level and the offset level in digital form to the data input terminal of the radio frequency generator.