Charge pump with perfect current matching characteristics in phase-locked loops

@article{Lee2000ChargePW,
  title={Charge pump with perfect current matching characteristics in phase-locked loops},
  author={J. Lee and Min-Sun Keel and S. Lim and S. Kim},
  journal={Electronics Letters},
  year={2000},
  volume={36},
  pages={1907-1908}
}
Conventional CMOS charge pump circuits have some current mismatching characteristics. The current mismatch of the charge pump in the PLLs generates a phase offset, which increases spurs in the PLL output signals. In particular, it reduces the locking range in wide range PLLs with a dual loop scheme. A new charge pump circuit with perfect current matching characteristics is proposed. By using an error amplifier and reference current sources, one can achieve a charge pump with good current… Expand
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