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Phase lock loop

  • US 20020036545A1
  • Filed: 08/13/2001
  • Published: 03/28/2002
  • Est. Priority Date: 08/18/2000
  • Status: Active Grant
First Claim
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1. A method for tuning a voltage controlled oscillator (VCO) using a phase lock loop (PLL) in order to lock the VCO to a predetermined frequency using a VCO code having a plurality of bits, comprising the steps of:

  • (a) placing the PLL in an open loop phase and while in the open loop phase, performing the following steps;

    (a1) using linear interpolation to set some of the VCO code'"'"'s plurality of bits; and

    (a2) using a successive approximation register (SAR) to set the remaining bits of from amongst the plurality of bits in the VCO code; and

    (b) placing the PLL in a closed loop phase and while in the closed loop phase;

    (b1) completing the VCO frequency locking process by fine tuning the VCO.

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