A 1-V 2.4-GHz CMOS frequency synthesizer with current-match charge pump

@article{Wu2004A12,
  title={A 1-V 2.4-GHz CMOS frequency synthesizer with current-match charge pump},
  author={Chung-Yu Wu and Chih-Yuan Hsieh and Wei-Ming Chen},
  journal={The 2004 IEEE Asia-Pacific Conference on Circuits and Systems, 2004. Proceedings.},
  year={2004},
  volume={1},
  pages={433-436 vol.1}
}
A 1-V 2.4-GHz fully integrated frequency synthesizer for Bluetooth applications is proposed and designed in 0.25-mum CMOS technology. An improved current-match charge pump circuit without the start-up problem is used to reduce the spur level. Moreover, a bandswitching VCO is used to reduce the Kvco and hence the spur level can be further reduced. The prescaler is designed in 1-V supply voltage without the supply-voltage boosting. The circuit is verified by both HSPICE and ADS simulations 
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