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    • 1. 发明授权
    • Circuitry for the delay adjustment of a clock signal
    • 电路用于时钟信号的延迟调整
    • US5945862A
    • 1999-08-31
    • US904203
    • 1997-07-31
    • Kevin S. DonnellyJun KimBruno W. GarleppMark A. HorowitzThomas H. LeePak Shing ChauJared L. ZerbeClemenz L. PortmannYiu-Fai Chan
    • Kevin S. DonnellyJun KimBruno W. GarleppMark A. HorowitzThomas H. LeePak Shing ChauJared L. ZerbeClemenz L. PortmannYiu-Fai Chan
    • H03K5/13H03H11/26
    • H03K5/1565H03K5/13
    • Circuitry for adjusting the phase of an incoming periodic signal, typically a clock signal, throughout the entire period of the periodic signal. Phase adjustment circuitry has high resolution and employs only the number of delay elements in a delay chain necessary to span at least the period of the incoming signal or at least half the period in the case of dual chains receiving complementary clocks. Phase adjustment circuitry includes a delay chain of having a plurality of taps, a boundary detector for indicating when a tap is at a phase boundary of the incoming periodic signal, and selection circuitry for selecting one of the taps from the delay chain based on the boundary detector output and the selection circuitry input such that the selected tap is the desired phase adjustment of the incoming periodic signal and that the delay of the incoming signal is adjustable across its phase boundaries. Phase interpolation between the taps of the delay chain is employed to increase the resolution of the adjustment to the periodic signal. Duty cycle correction of the input clock and the selected output clock is employed to improve accuracy.
    • 用于在整个周期信号的整个周期内调整进入周期信号(通常为时钟信号)的相位的电路。 相位调整电路具有高分辨率,并且仅在延迟链中仅使用延伸元件的数量来跨越至少输入信号的周期,或者在双链接收互补时钟的情况下至少半个周期。 相位调整电路包括具有多个抽头的延迟链,边界检测器,用于指示抽头何时处于输入周期性信号的相位边界;以及选择电路,用于基于边界从延迟链中选择一个抽头 检测器输出和选择电路输入,使得所选择的抽头是输入周期性信号的期望的相位调整,并且输入信号的延迟在其相位边界上是可调节的。 使用延迟链的抽头之间的相位插值来增加对周期性信号的调整的分辨率。 采用输入时钟和选择的输出时钟的占空比校正来提高精度。