Patent ID: 8513889
Filing Date: 2013-08-20
Classification: H01J,H03H,H05H

Abstract:
1. A method of tuning a matching network during a plasma process, comprising: (a) providing a matching network coupling an RF source to a load, the matching network having a first tunable element disposed at a first set point; (b) increasing a value of the first tunable element by a first step above the first set point; (c) sensing a first adjusted value of a reflected RF power; (d) decreasing the value of the first tunable element by the first step below the first set point; (e) sensing a second adjusted value of the reflected RF power; (f) comparing the first and the second adjusted values of the reflected RF power; and (g) moving the first tunable element to a second set point that corresponds to a position having a lowest adjusted value of the reflected RF power.