Phase-locked loop device with managed transition to random noise operation mode

摘要

A phase-locked loop device is adapted for managing transition from relaxation-oscillation mode to random noise operation mode. It is designed for progressively reducing proportional (K P ) and integral (K I ) coefficients that are implemented in a loop filter (2) of the PLL device. Recovering of last values formerly used for said proportional and integral coefficients is also provided, in case PLL lock state is lost. Such transition management may be combined with using a voltage-controlled oscillator (3) within the PLL device, which has several control inputs.