Patent ID: 6562190
Filing Date: 2003-05-13
Classification: H01J

Abstract:
A plasma processing system for processing a wafer using single frequency RF power, comprising:a modulated RF power generator configured to generate a modulated RF power, the modulated RF power generator includes, a modulation controller having circuitry for varying modulation depth of the modulated RF power without amplitude modulation circuitry, and an RF generator coupled to receive control from the modulation controller; a plasma processing chamber arranged to receive the modulated RF power for processing the wafer, the plasma processing chamber being characterized by an internal impedance during the plasma processing, the plasma processing chamber including an electrostatic chuck for holding the wafer in place, the electrostatic chuck including a first electrode disposed under the wafer for directly receiving the modulated RF power, and the plasma processing chamber further including a second electrode that is grounded and disposed over the wafer, wherein the plasma and ion bombardment energy are generated for processing the wafer in response to the modulated RF power; and a match network coupled between the modulated RF power generator and the plasma processing chamber to receive and transmit the modulated RF power from the modulated RF power generator to the plasma processing chamber, the match network being further configured to match an impedance of the modulated RF power generator to the internal impedance of the plasma processing chamber.