Patent ID: 11915912
Assignee: LAM RESEARCH CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method comprising:
controlling a primary radio frequency (RF) generator to pulse a primary RF signal in a first manner between a primary frequency level during a first time period and an off frequency level during a second time period;
controlling a secondary RF generator to pulse a secondary RF signal in a second manner between the off frequency level during the first time period and a secondary frequency level during the second time period, wherein the primary and secondary RF generators are coupled to an upper electrode of a plasma chamber via an impedance matching network;
controlling the primary RF generator to pulse the primary RF signal between the primary and off frequency levels during additional time periods in the same first manner as that during the first and second time periods; and
controlling the secondary RF generator to pulse the secondary RF signal between the off and secondary frequency levels during the additional time periods in the same second manner as that during the first and second time periods.