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    • 7. 发明授权
    • Radio frequency generating systems and methods for forming pulse plasma
using gradually pulsed time-modulated radio frequency power
    • 射频发生系统和使用逐渐脉冲调制的射频功率形成脉冲等离子体的方法
    • US5859501A
    • 1999-01-12
    • US818256
    • 1997-03-14
    • Kyeong-koo Chi
    • Kyeong-koo Chi
    • C23F4/00H01L21/302H01L21/3065H03B28/00H05H1/46
    • H05H1/46
    • A radio frequency (RF) generating system for forming pulse plasma utilizes a plasma reaction device comprises a function generator, an amplifier, and an input port. The function generator generates a signal of time-modulated RF power according to a modulation function having a waveform, wherein the waveform gradually ascends at a rising edge and gradually descends at a falling edge. The input port receives the signal from the function generator and transmits the signal to the amplifier. The amplifier amplifies the signal to a predetermined level and then transmits the amplified signal to the plasma reaction device. A method for forming pulse plasma comprises the steps of generating a time-modulated RF power signal according to a modulation function having a waveform, wherein the waveform is shaped to gradually ascend at a rising edge and to gradually descend at a falling edge, amplifying the time-modulated RF power signal to a predetermined level, and transmitting the amplified time-modulated RF power signal to a plasma reaction device. In an embodiment of the present invention, the waveform is a half sine waveform, though other suitable waveforms include a half cosine waveform and a Gaussian pulse signal.
    • 用于形成脉冲等离子体的射频(RF)生成系统利用等离子体反应装置,其包括功能发生器,放大器和输入端口。 函数发生器根据具有波形的调制函数产生时间调制的RF功率的信号,其中波形在上升沿逐渐上升,并且在下降沿逐渐下降。 输入端口接收来自函数发生器的信号,并将该信号发送到放大器。 放大器将信号放大到预定电平,然后将放大的信号传输到等离子体反应装置。 用于形成脉冲等离子体的方法包括以下步骤:根据具有波形的调制函数产生时间调制的RF功率信号,其中波形被成形为在上升沿逐渐上升并且在下降沿逐渐下降, 时间调制的RF功率信号到预定电平,并且将放大的经时间调制的RF功率信号发送到等离子体反应装置。 在本发明的一个实施例中,波形是半正弦波形,尽管其它合适的波形包括半余弦波形和高斯脉冲信号。