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Fast locking phase-locked loop

  • US 8,643,414 B1
  • Filed: 02/12/2013
  • Issued: 02/04/2014
  • Est. Priority Date: 02/13/2012
  • Status: Active Grant
First Claim
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1. A phase-locked loop, comprising:

  • a variable-frequency oscillator to produce a first signal;

    a phase detector to receive a reference signal and a feedback signal;

    a phase-alignment circuit to receive the first signal and an output of the phase detector, the phase-alignment circuit to produce a phase adjusted signal based on the first signal, the phase adjusted signal to be used as the feedback signal;

    a loop filter to receive the output of the phase detector; and

    ,wherein, after a reactivation of the phase-locked loop but before the loop filter controls the variable-frequency oscillator to adjust a frequency of the first signal, a phase adjustment of the feedback signal is to be made by the phase-alignment circuit to calibrate a phase differential between the feedback signal and the reference signal.

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