Ring-VCO based low noise and low spur frequency synthesizer

  title={Ring-VCO based low noise and low spur frequency synthesizer},
  author={Te-Wen Liao and Jun-Ren Su and Chung-Chih Hung},
  journal={2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)},
This paper presents a low phase-noise phase locked loop (PLL) system with a Multi-Phase Over-Sampling Charge Pump (MPOSCP) for wireless applications. The low phase-noise frequency synthesizer reduces ripples and noise on the control voltage of the ring voltage-controlled oscillator (VCO) as a means to control in-band noise at the output of the PLL. An MPOSCP is proposed to perform multi-phase over-sampling control for the charge pump (CP) in locked state. The proposed frequency synthesizer was… CONTINUE READING