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    • 3. 发明授权
    • Method and apparatus for determining the endpoint in a plasma cleaning
process
    • 用于确定血浆清洁过程中的终点的方法和装置
    • US6079426A
    • 2000-06-27
    • US887165
    • 1997-07-02
    • Sudhakar SubrahmanyamTsutomu TanakaMukul Kelkar
    • Sudhakar SubrahmanyamTsutomu TanakaMukul Kelkar
    • H05H1/46C23C16/44C23G5/028C23G5/04H01J37/32H01L21/205H01L21/31B08B6/00G01L21/30
    • H01J37/32935C23C16/4405H01J37/32963H01J2237/335Y10S156/916
    • Apparatus and methods are disclosed for utilizing a plasma cleaning operation of a CVD system incorporating cleaning process endpoint detection. In one embodiment, the cleaning process is performed at a constant exhaust capacity and the endpoint detection is in response to a specified rate of change of chamber pressure. In another embodiment, a servo-controlled exhaust system maintains a controlled chamber pressure and the endpoint detection is in response to a specified control signal. In a preferred embodiment, nitrogen trifluoride is converted into a plasma containing free fluorine radicals in a magnetron-powered remote microwave plasma generator. The remotely produced free fluorine radicals are used to remove silicon nitride deposits from a substrate processing chamber. The use of such a remote plasma system provides an efficient cleaning process that takes as little as half the time compared to similar in situ plasma cleaning processes. The incorporation of endpoint detection provides optimal cleaning time for the remote plasma cleaning process.
    • 公开了利用包含清洁过程端点检测的CVD系统的等离子体清洁操作的装置和方法。 在一个实施例中,清洁过程以恒定的排气量执行,并且端点检测响应于室压力的指定变化率。 在另一个实施例中,伺服控制的排气系统保持受控的室压力,并且端点检测响应于指定的控制信号。 在优选的实施方案中,在由磁控管供电的远程微波等离子体发生器中将三氟化氮转化成含有游离氟自由基的等离子体。 远程产生的自由氟基团用于从衬底处理室去除氮化硅沉积物。 使用这样的远程等离子体系统提供了有效的清洁过程,与类似的原位等离子体清洁过程相比,其需要的时间只有时间的一半。 结合端点检测为远程等离子体清洗过程提供了最佳的清洗时间。
    • 9. 发明授权
    • Circuit and method for generating a clock signal
    • 用于产生时钟信号的电路和方法
    • US06958658B2
    • 2005-10-25
    • US10400146
    • 2003-03-25
    • Prasanna C. ShahMukul Kelkar
    • Prasanna C. ShahMukul Kelkar
    • H03B1/00H03B27/00
    • H03K3/0315
    • In some embodiments, a circuit includes an oscillator circuit, a control circuit, and a synchronization circuit. The oscillator circuit generates a clock signal and includes a selectable delay circuit. The control circuit receives the clock signal from the oscillator and a reference signal. The control circuit provides a control signal to the synchronization circuit which provides a control signal that has been synchronized to the oscillator circuit to activate the selectable delay circuit to change the frequency of the clock signal. In some embodiments, a method includes generating a clock signal in an oscillator circuit, and synchronizing activation of a selectable delay circuit in the oscillator circuit to a local clock signal.
    • 在一些实施例中,电路包括振荡器电路,控制电路和同步电路。 振荡器电路产生时钟信号并包括可选延迟电路。 控制电路接收来自振荡器的时钟信号和参考信号。 控制电路向同步电路提供控制信号,其提供已经与振荡器电路同步的控制信号,以激活可选择的延迟电路以改变时钟信号的频率。 在一些实施例中,一种方法包括在振荡器电路中产生时钟信号,以及将振荡器电路中的可选延迟电路的激活同步到本地时钟信号。