A charge pump phase-locked loop with dual-voltage controlled VCO applied to 28nm process FPGA

In order to meet the increasing clock requirements of FPGAs, Phase-locked loop has been widely used in FPGAs as clock management unit. This paper introduces a charge pump phase-locked loop with dual voltage-controlled oscillator applied on a 28nm FPGA platform. On the basis of the traditional charge pump phase-locked loop, this paper designs a configurable filter, a new structure of VCO with amplification and shaping circuit. The simulation results show that the structure can effectively improve the frequency locking speed of the VCO.