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    • 2. 发明申请
    • Phase-locked loop
    • 锁相环
    • US20070140399A1
    • 2007-06-21
    • US11403665
    • 2006-04-13
    • Marcel KosselThomas Morf
    • Marcel KosselThomas Morf
    • H03D3/24
    • H03L7/113H03L7/091H03L7/093H03L7/0998
    • The phase-locked loop according to the invention comprises a frequency acquisition loop. The frequency acquisition loop comprises a counter that is operable to count the number of periods of an oscillator signal occurring during a predetermined period of time that is derived from a reference signal period of a reference signal. The oscillator signal has an oscillator signal frequency and an oscillator signal phase. The frequency acquisition loop also comprises a subtractor that is operable to compare the counted number of periods with a desired division factor, wherein N=fVCOlocked/fref and wherein fVCOlocked denotes a desired frequency of the oscillator signal in a locked state of the phase-locked loop and fref denotes the frequency of said reference signal. The comparison results in a subtractor output frequency value. The phase-locked loop further comprises a phase acquisition loop. The phase acquisition loop comprises a phase rotator for adjusting the oscillator signal by a rotator phase, and a counter that is operable to count the number of periods of the phase-adjusted oscillator signal occurring during the predetermined period of time. The phase acquisition loop also comprises a subtractor that is operable to compare the counted number of periods with the desired division factor. The comparison results in a subtractor output phase value. The phase-locked loop further comprises a state machine that is operable to effectuate in dependence of the subtractor output frequency value and the subtractor output phase value an adjustment of the oscillator signal frequency and the oscillator signal phase.
    • 根据本发明的锁相环包括频率采集环路。 频率获取环路包括计数器,该计数器可操作以对从参考信号的参考信号周期导出的预定时间段期间发生的振荡器信号的周期数进行计数。 振荡器信号具有振荡器信号频率和振荡器信号相位。 频率获取环路还包括减法器,其可操作以将计数的周期数与期望的分频因子进行比较,其中N = f VCOlocked / f ref ref,其中f < SUB> VCO锁定表示在锁相环的锁定状态下的振荡器信号的期望频率,f ref表示所述参考信号的频率。 比较结果是减法器的输出频率值。 锁相环还包括相位采集环路。 相位采集环路包括用于通过旋转相位调节振荡器信号的相位旋转器和可操作以对在预定时间段内发生的相位调整的振荡器信号的周期数进行计数的计数器。 相位采集环路还包括减法器,其可操作以将计数的周期数与期望的分频因子进行比较。 比较结果是减法器输出相位值。 锁相环还包括状态机,其可操作以根据减法器输出频率值和减法器输出相位值来实现振荡器信号频率和振荡器信号相位的调整。