Patent ID: 9460894
Filing Date: 2016-10-04
CPC Classification: H01J

Claim Text:
1. A system for controlling ion energy within a plasma chamber, comprising: a sinusoidal radio frequency (RF) generator configured to generate a first sinusoidal signal; an upper electrode coupled to the sinusoidal RF generator and configured to receive the first sinusoidal signal; a nonsinusoidal RF generator including a sinusoidal waveform generator and a first filter, wherein the sinusoidal waveform generator is configured to generate a second sinusoidal signal, and the first filter is configured to receive the second sinusoidal signal and generate a nonsinusoidal signal having no off cycles; a power amplifier coupled to the nonsinusoidal RF generator, the power amplifier configured to receive the nonsinusoidal signal and generate an amplified nonsinusoidal signal; a second filter coupled to the power amplifier, the second filter configured to receive the amplified nonsinusoidal signal and generate a filtered nonsinusoidal signal having a series of pulses between consecutive off cycles, wherein the pulses of the filtered nonsinusoidal signal are nonsinusoidal; and a chuck coupled to the second filter, wherein the chuck includes a lower electrode and is configured to face at least a portion of the upper electrode, the lower electrode is configured to receive the filtered nonsinusoidal signal to adjust ion energy at the chuck to be between a lower threshold and an upper threshold.