Patent ID: 8932429
Filing Date: 2015-01-13
Classification: H01J,H01L

Abstract:
1. An apparatus for processing a wafer, comprising: a chamber for plasma processing of the wafer, the chamber having an electrode assembly that includes a support surface and an outer edge region surrounding the support surface; a radio frequency (RF) power source for providing RF power to the electrode assembly; a matching circuit coupled to the RF power source; an RF power connection structure coupled between the electrode assembly and an output of the matching circuit, the RF power connection structure including a conductive delivery connection to deliver the RF power to the electrode assembly and a conductive return connection for returning at least some of the RF power from the electrode assembly back to the output of matching circuit, the RF power connection structure having a length, a first end, and a second end, the first end coupled to the output of the matching circuit and the second end coupled to the electrode assembly, the length is set for an operating frequency, such that the length enables impedance transformation between the first end and the second end; and a variable capacitor connected between an output of the matching circuit and the first end of the RF power connection structure, the variable capacitor is not coupled to an inductor to define a resonant circuit at the output of the matching circuit.