| 摘要 |
Systems and method are described for clock recovery or detection of rapid phase transients. An apparatus includes: a numerically controlled oscillator; a phase detector coupled to the numerically controlled oscillator; and a multiplexer coupled to the phase detector and the numerically controlled oscillator, wherein a) the phase detector sets a state variable indicator to either i) a high value when an output phase of the numerically controlled oscillator lags an incoming signal phase, or ii) a low value when the output phase leads the incoming signal phase, b) the multiplexer sends either i) a high increment to the numerically controlled oscillator when the state variable indicator has been set to the high value, or ii) a low increment to the numerically controlled oscillator when the state variable indicator has been set to the low value, and c) the numerically controlled oscillator either i) advances the output phase when the high increment has been sent to the numerically controlled oscillator, or ii) retards the output phase when the low increment has been sent to the numerically controlled oscillator.
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