Patent ID: 11871503
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An RF system used in a plasma processing apparatus, the RF system comprising:
a first RF power supply configured to generate a bias RF power having a first frequency, wherein a waveform defined by the first frequency has a plurality of cycles each divided into a first half cycle and a second half cycle;
a second RF power supply configured to generate a source RF power having a second frequency higher than the first frequency; and
a controller configured to
(a) in a first period, control the second RF power supply such that the source RF power is generated during at least a portion of the first half cycle, and is not generated during the second half cycle, and
(b) in a second period, control the second RF power supply such that the source RF power is generated during at least a portion of the second half cycle, and is not generated during the first half cycle.