Patent ID: 7615132
Filing Date: 2009-11-10
Classification: H01J

Abstract:
1. A plasma processing apparatus, comprising: a plasma generation means which generates plasma within the interior of a processing chamber; a means for applying a high frequency voltage to an object to be processed; a processing chamber to which a vacuum system is connected and the interior of which can be depressurized; a gas supply device which supplies a gas to the interior of the processing chamber; a substrate electrode disposed in the processing chamber, where the object to be processed is placed on the substrate electrode which is coated with a dielectric film; and a substrate bias power source which supplies a substrate bias voltage to the substrate electrode; wherein the substrate bias power source includes a rectangular wave power source which generates a substantially rectangular wave, and a clip circuit, the clip circuit comprising: a diode which removes at least one of a positive side and a negative side of a high frequency voltage waveform being output from the substrate bias power source and performs a voltage waveform operation so as to obtain a flat voltage waveform portion with time; and a circuit having a transistor and a capacitor which generates a inclined portion to increase with time an absolute value of voltage on at least either of the positive side or the negative side of said that voltage waveform portion; wherein the high frequency voltage waveform is controlled so as to be the voltage waveform in which a positive constant voltage and a negative constant voltage alternate with each other at given cycles.