Patent ID: 9320127
Filing Date: 2016-04-19
CPC Classification: H01J,H05H

Claim Text:
1. A method for tuning a parameter associated with plasma impedance, comprising: receiving information to determine a variable, the information measured at a transmission line, the information measured when the parameter has a first value, the transmission line used to provide power to a plasma chamber via an impedance matching circuit; determining whether the variable is at a local minima; providing the first value to generate a radio frequency (RF) signal upon determining that the variable is at the local minima, the RF signal corresponding to the first value, the RF signal to be sent to the plasma chamber; changing the first value to a second value of the parameter upon determining that the variable is not at the local minima; and determining whether the variable is at a local minima when the parameter has the second value, wherein the method is executed by a processor.