Patent ID: 9673069
Date: 2017-06-06
CPC Classifications: H01J,H01L,H05H

Claim:
1. A substrate processing system comprising: a radio frequency (RF) source configured to generate RF source energy in a first frequency band to form a plasma within the system, wherein the RF source is terminated through an electrode; a bias source coupled to the electrode to apply bias energy to the electrode; a first filter disposed between the bias source and the electrode, the first filter configured to pass the bias energy to the electrode, block RF source energy in the first frequency band from reaching the bias source and provide a low impedance to ground for the RF source energy in the first frequency band; and an RF sensor disposed in serial with the first filter, wherein both the RF sensor and the first filter that is configured to pass the bias energy to the electrode and provide the low impedance to ground for the RF source energy in the first frequency band are disposed between the electrode and the bias source, and the RF sensor is configured to provide an indication of a voltage potential of the electrode.