The device of the shake of detection phase-locked loop

The device of the shake of detection phase-locked loop

  • CN 102,118,161 B
  • Filed: 09/28/2010
  • Issued: 09/28/2016
  • Est. Priority Date: 12/31/2009
  • Status: Active Grant
First Claim
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1. detecting a device for the shake of phase-locked loop PLL, this device includes:

  • Described PLL, it is configured to detect the phase difference signal between reference clock and feedback clock, and generates the oscillator signal with preset frequency according to described phase difference signal;

    Variable phase delay unit, multiple capacitors are switched by its delayed control signal being configured to according to input, the described phase difference signal from described PLL is postponed according to described delayed control signal, wherein, described delayed control signal is stored in depositor as predetermined amount of jitter;

    Comparator, it is configured to compare the phase difference signal from described PLL with the phase difference signal after described variable phase delay cell delay, and detects the delay period of described phase difference signal;

    AndLock detection unit, it is configured to whether detection described oscillator signal after the described delay period detected by described comparator is in lock-in range, according to the lock detecting signal exported by described lock detection unit, by referring to being arranged to the retardation of described delayed control signal to judge that jitter level is in the described lock-in range of described PLL.

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