Method for a Constant Loop Bandwidth in LC-VCO PLL Frequency Synthesizers

  title={Method for a Constant Loop Bandwidth in LC-VCO PLL Frequency Synthesizers},
  author={Ting Wu and P. Hanumolu and K. Mayaram and U. Moon},
  journal={IEEE Journal of Solid-State Circuits},
An LC-VCO based phase-locked loop (PLL) frequency synthesizer which incorporates loop bandwidth tracking is described. In order to minimize loop bandwidth variations resulting from changes in the LC-VCO gain, the proposed PLL employs an averaging varactor based split-tuned LC-VCO and a servo loop which sets the charge-pump current to be inversely proportional to the square of the oscillation frequency. The combination of these techniques maintains a constant loop bandwidth over a wide range of… Expand
82 Citations
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