Second-level frequency-phase detection charge pump phase-locked loop


  • Inventors: WEI JIANJUN
  • Assignees: 魏建军
  • Publication Date: April 29, 2015
  • Publication Number: CN-104579323-A


The invention discloses a charge pump phase-locked loop which can be locked quickly. A second-level frequency-phase detector is adopted in the charge pump phase-locked loop; the output of a first-level frequency-phase detector is buffered and filtered and then is subjected to frequency-phase detection; a current charge pump is driven and adjusted coarsely, and the output of the first-level frequency-phase detector directly drives and finely adjusts the current charge pump at the same time; the control voltage at a control end of a voltage-controlled oscillator is adjusted. The output noise of the charge pump phase-locked loop is reduced while the lock speed of the charge pump phase-locked loop is increased.




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