Phase-locked loop bandwidth calibration circuit and method thereof

Phase-locked loop bandwidth calibration circuit and method thereof

  • CN 1,879,304 A
  • Filed: 10/01/2004
  • Published: 12/13/2006
  • Est. Priority Date: 10/03/2003
  • Status: Active Application
First Claim
Patent Images

1. bandwidth of phase lock loop calibration circuit comprises:

  • Programmable charge pump;

    Be connected to the phase locked loop filter of described programmable charge pump in the operation;

    Be connected to the oscillator of described phase locked loop filter in the operation, be used for based on the signal generated frequency signal that receives from described phase locked loop filter;

    Be connected in the operation described phase locked loop filter and described programmable charge pump control loop;

    Described control loop is controlled described programmable charge pump and is adjusted the output current level based on the gain that records of described oscillator.

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