A Wide-Bandwidth 2.4 GHz ISM Band Fractional-$N$ PLL With Adaptive Phase Noise Cancellation

  title={A Wide-Bandwidth 2.4 GHz ISM Band Fractional-\$N\$ PLL With Adaptive Phase Noise Cancellation},
  author={Ashok Swaminathan and Kevin J. Wang and Ian Galton},
  journal={IEEE Journal of Solid-State Circuits},
A fast-settling adaptive calibration technique is presented that makes phase noise cancelling DeltaSigma fractional-N PLLs practical for the low reference frequencies commonly used in wireless communication systems. The technique is demonstrated as an enabling component of a 2.4 GHz ISM band CMOS PLL IC with a 730 kHz bandwidth, a 12 MHz reference, and an on-chip loop filter. In addition to the adaptive calibration technique, the IC incorporates a dynamic charge pump biasing technique to reduce… CONTINUE READING
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