Patent ID: 7019543
Filing Date: 2006-03-28
Classification: G01R,H01J,Y02E

Abstract:
1. An apparatus for measuring impedance in a capacitively coupled plasma reactor system having an upper and lower electrode capable of forming a plasma therebetween when a plasma generating RF signal is coupled to at least one of the upper and lower electrodes, comprising: a) a high-frequency RF source in electrical communication with the upper electrode and capable of generating an electrical probe signal having a higher frequency than said plasma generating RF signal; b) a first high-pass filter arranged between the upper electrode and said high-frequency RF source, for passing high-frequency components of the electrical probe signal to said upper electrode and isolating said high frequency RF source from said plasma generating RF signal; and c) a current-voltage probe arranged between said high-frequency source and said high-pass filter, for measuring the current and voltage of the probe signal.