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    • 3. 发明申请
    • PHASE MODULATION METHOD FOR SPREAD SPECTRUM CLOCK GENERATOR
    • 传播频谱时钟发生器的相位调制方法
    • US20080107154A1
    • 2008-05-08
    • US11737467
    • 2007-04-19
    • Lin Hsiao-Chyi
    • Lin Hsiao-Chyi
    • H04B1/00
    • H03L7/1974H03L7/0891
    • Spread spectrum clock generation (SSCG) using phase modulation. A first clock signal having a first frequency spectrum may be modulated using phase modulation to produce a second clock signal. The phase modulation may include providing a phase modulation profile corresponding to the integrated frequency modulation profile, to adjust a scaling factor used in obtaining the second clock signal. The phase modulation profile may be provided in the form of a pulse or pulses, which may be injected through pulse density modulation or pulse width modulation at the output of a phase frequency detector comprised in a phase locked loop circuit used in generating the second clock signal. This modified phase modulation technique removes the down spread limitation present in traditional PM implementations, and also provides better jitter performance and lower cost than traditional PM implementations.
    • 扩频时钟产生(SSCG)使用相位调制。 可以使用相位调制来调制具有第一频谱的第一时钟信号以产生第二时钟信号。 相位调制可以包括提供对应于集成频率调制曲线的相位调制曲线,以调整用于获得第二时钟信号的缩放因子。 相位调制曲线可以以脉冲或脉冲的形式提供,其可以在包括在用于产生第二时钟信号的锁相环电路中的相位频率检测器的输出处通过脉冲密度调制或脉冲宽度调制来注入 。 这种修改的相位调制技术消除了传统PM实现中存在的向下扩展限制,并且还提供比传统PM实现更好的抖动性能和更低的成本。