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    • 1. 发明申请
    • DELTA-SIGMA MODULATOR CLOCK DITHERING IN A FRACTIONAL-N PHASE-LOCKED LOOP
    • DELTA-SIGMA调制器时钟在一个分段N相锁定环路
    • WO2009108815A1
    • 2009-09-03
    • PCT/US2009/035349
    • 2009-02-26
    • QUALCOMM IncorporatedXU, YangZHANG, GangGUDEM, Prasad S.
    • XU, YangZHANG, GangGUDEM, Prasad S.
    • H03L7/197
    • H03L7/1974
    • The clock signal supplied to the delta-sigma modulator in a fractional-N phase-locked loop is dithered. In one example, the PLL includes a novel programmable clock dithering circuit. The programmable clock dithering circuit is controllable via a serial bus to dither the phase of the clock signal in a selected one of several ways. If the clock signal is dithered in a first way (pseudo-random phase dithering), then the power of digital noise generated by the delta-sigma modulator is spread over a frequency band, thereby reducing the degree to which the noise interferes with other circuitry. If the clock signal is dithered in a second way (rotational phase dithering), then the power of digital noise is frequency shifted such that the degree to which the noise interferes with the other circuitry is reduced. The programmable clock dithering circuit can be controlled in other ways. For example, dithering can be programmably disabled.
    • 在分数N锁相环中提供给Δ-Σ调制器的时钟信号被抖动。 在一个示例中,PLL包括新颖的可编程时钟抖动电路。 可编程时钟抖动电路可通过串行总线进行控制,以选择的几种方式对时钟信号的相位进行抖动。 如果时钟信号以第一种方式抖动(伪随机相位抖动),则由Δ-Σ调制器产生的数字噪声的功率在频带上扩展,从而降低噪声干扰其他电路的程度 。 如果时钟信号以第二种方式抖动(旋转相位抖动),则数字噪声的功率被频移,使得噪声干扰另一电路的程度降低。 可编程时钟抖动电路可以以其他方式进行控制。 例如,抖动可以可编程地禁用。
    • 9. 发明申请
    • OPEN HOLE FRAC SYSTEM
    • 开孔系统
    • WO2010120469A2
    • 2010-10-21
    • PCT/US2010/028784
    • 2010-03-26
    • BAKER HUGHES INCORPORATEDRICHARD, Bennett, M.XU, Yang
    • RICHARD, Bennett, M.XU, Yang
    • E21B43/26E21B33/12E21B23/06
    • E21B43/26E21B33/10E21B34/14
    • A fracturing operation is done in open hole without annular space isolation. The annular space is spanned by telescoping members that are located behind isolation valves. A given bank of telescoping members can be uncovered and the telescoping members extended to span the annular space and engage the formation in a sealing manner. Pressurized fracturing fluid can be pumped through the telescoped passages and the portion of the desired formation fractured. In a proper formation, cementing is not needed to maintain wellbore integrity. The telescoping members can optionally have screens. Normally, the nature of the formation is such that gravel packing is also not required. A production string can be inserted into the string with the telescoping devices and the formation portions of interest can be produced through the selectively exposed telescoping members.
    • 在没有环形空间隔离的开孔中进行压裂作业。 环形空间由位于隔离阀后面的伸缩构件跨越。 一组给定的伸缩构件可以不被覆盖,并且伸缩构件延伸以跨越环形空间并以密封方式接合地层。 加压压裂液可以泵送通过可伸缩通道,并且所需地层的部分断裂。 在适当的形成中,不需要固井来保持井身完整性。 伸缩构件可以可选地具有屏幕。 通常,地层的性质是不需要砾石填料。 生产线可以用伸缩装置插入弦中,并且可以通过选择性地暴露的伸缩构件来产生感兴趣的形成部分。