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

一种二级鉴频鉴相电荷泵锁相环

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

Abstract

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.
一种能够快速锁定的电荷泵锁相环,它是在电荷泵锁相环中采用二级鉴频鉴相器,对第一级鉴频鉴相器的输出经过缓冲和滤波后,再进行鉴频鉴相,驱动粗调电流电荷泵,同时第一级鉴相鉴频器的输出直接驱动微调电流电荷泵,调节压控振荡器控制端处的控制电压,在提高电荷泵锁相环锁定速度的同时降低其输出噪声。

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